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김경종
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---
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type: concept
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title: "Abaqus Beam and Shell Section Definitions"
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complexity: advanced
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domain: computational-mechanics
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created: 2026-06-01
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updated: 2026-06-01
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address: c-000108
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aliases:
|
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- Abaqus beam sections
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- Abaqus shell sections
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- Abaqus composite shell sections
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tags:
|
||||
- concept
|
||||
- finite-element-method
|
||||
- abaqus
|
||||
- sections
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- beam-elements
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- shell-elements
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status: current
|
||||
related:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]"
|
||||
- "[[Abaqus Structural Element Families]]"
|
||||
- "[[Abaqus Material Library and Data Definition]]"
|
||||
- "[[Abaqus Spatial Model Definition]]"
|
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- "[[Beam and Frame Finite Elements]]"
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- "[[MITC4 Shell Element]]"
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sources:
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- "[[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]"
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---
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# Abaqus Beam and Shell Section Definitions
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## Definition
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Abaqus beam and shell section definitions attach cross-section geometry, thickness, material layout, integration rules, and generalized section behavior to lower-dimensional structural elements.
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## How They Work
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Beam sections can be defined as general section behavior or integrated during the analysis. Integrated sections use geometric cross-section data and material behavior to compute section response; general sections allow stiffness and mass-like behavior to be supplied more directly. Beam orientation and section axes determine how bending, shear, and torsion are interpreted.
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Shell sections similarly define thickness behavior for conventional and continuum shells. A shell section can use homogeneous or composite layers, through-thickness integration points, material orientations, section controls, and output points. General shell sections are useful when the analyst wants to supply an effective section stiffness rather than integrate the material response through the thickness.
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## Why It Matters
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For beams and shells, the element topology is only half the model. Section data carries the missing geometry, material distribution, and integration behavior, so incorrect section definitions can be as damaging as incorrect element choice.
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## Connections
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- [[Abaqus Structural Element Families]] explains which element families consume section definitions.
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- [[Abaqus Material Library and Data Definition]] supplies the material blocks used by integrated sections.
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- [[Abaqus Spatial Model Definition]] is where elements, sets, orientations, and sections are connected.
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- [[Beam and Frame Finite Elements]] and [[MITC4 Shell Element]] provide the structural theory background.
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## Sources
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||||
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- [[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]
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||||
|
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@@ -0,0 +1,60 @@
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---
|
||||
type: concept
|
||||
title: "Abaqus Cavity Radiation Interactions"
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||||
complexity: advanced
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||||
domain: computational-mechanics
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||||
created: 2026-06-01
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updated: 2026-06-01
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address: c-000128
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aliases:
|
||||
- Abaqus cavity radiation
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- Abaqus enclosure radiation
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- Abaqus radiation view factors
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tags:
|
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- concept
|
||||
- finite-element-method
|
||||
- abaqus
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- heat-transfer
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- radiation
|
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- interactions
|
||||
status: current
|
||||
related:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]"
|
||||
- "[[Finite Element Heat Transfer and Field Problems]]"
|
||||
- "[[Abaqus Thermal Expansion and Damping Materials]]"
|
||||
- "[[Abaqus Multiphysics Coupling and Co-simulation]]"
|
||||
- "[[Abaqus Surface and Assembly Modeling]]"
|
||||
- "[[Abaqus Resource and Parallel Execution]]"
|
||||
sources:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]"
|
||||
---
|
||||
|
||||
# Abaqus Cavity Radiation Interactions
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|
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## Definition
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Abaqus cavity radiation interactions model radiative heat transfer among surfaces in an enclosure using view factors, emissivity, and Stefan-Boltzmann radiation.
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|
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## How They Work
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|
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Cavities are collections of element-based surfaces with radiation properties. Each surface has emissivity, and the model must define physical constants such as the Stefan-Boltzmann constant and absolute zero. Cavities can be closed or open to an ambient environment.
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|
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Abaqus/Standard computes view factor matrices based on the geometric relationship between facets. Surface blocking, symmetry, surface motion, open cavities, and temperature-dependent emissivity can be included. Because cavity radiation equations are nonsymmetric and nonlinear, the solver may invoke nonsymmetric storage and additional view factor updates.
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Large cavities can be decomposed for parallel view factor calculation and radiation equation solution, but the view factor matrix can be expensive in memory and computation.
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## Why It Matters
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Cavity radiation is a surface interaction rather than a material property or ordinary thermal load. It is appropriate when enclosure geometry, blocking, reflection, or moving surfaces matter enough that average-temperature radiation or gap radiation is insufficient.
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## Connections
|
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|
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- [[Finite Element Heat Transfer and Field Problems]] supplies the thermal analysis context.
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- [[Abaqus Surface and Assembly Modeling]] provides the element-based surfaces used to construct cavities.
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- [[Abaqus Multiphysics Coupling and Co-simulation]] connects cavity radiation to sequential thermal-stress workflows.
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- [[Abaqus Resource and Parallel Execution]] matters for large view factor matrices and parallel decomposition.
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|
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## Sources
|
||||
|
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- [[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]
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|
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---
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||||
type: concept
|
||||
title: "Abaqus Cohesive and Gasket Elements"
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||||
complexity: advanced
|
||||
domain: computational-mechanics
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||||
created: 2026-06-01
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updated: 2026-06-01
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address: c-000111
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aliases:
|
||||
- Abaqus cohesive elements
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- Abaqus gasket elements
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- Abaqus traction-separation elements
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tags:
|
||||
- concept
|
||||
- finite-element-method
|
||||
- abaqus
|
||||
- cohesive-elements
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- gasket-elements
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||||
- fracture
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||||
status: current
|
||||
related:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]"
|
||||
- "[[Abaqus Special-Purpose Interaction Elements]]"
|
||||
- "[[Finite Element Contact Formulation]]"
|
||||
- "[[Abaqus Progressive Damage and Failure]]"
|
||||
- "[[Abaqus Fracture and Enriched Discontinuity Modeling]]"
|
||||
- "[[Abaqus Material Library and Data Definition]]"
|
||||
sources:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]"
|
||||
---
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||||
|
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# Abaqus Cohesive and Gasket Elements
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## Definition
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Abaqus cohesive and gasket elements are special-purpose interface elements for finite-thickness or zero-thickness layers whose response is dominated by separation, compression, sealing, or interface damage.
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## How They Work
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Cohesive elements can use a continuum approach or a traction-separation description. They support two-dimensional, three-dimensional, axisymmetric, and pore-pressure variants, and they often work together with damage initiation and damage evolution laws.
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Gasket elements represent sealing layers whose through-thickness compressive response is central. They can use material-based gasket behavior or directly specified gasket behavior, with two-dimensional, three-dimensional, and axisymmetric libraries.
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## Why It Matters
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These elements bridge contact, fracture, and material modeling. They are appropriate when an interface has its own constitutive thickness or degradation law, rather than being only a surface constraint.
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## Connections
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- [[Finite Element Contact Formulation]] covers surface-based interface alternatives.
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- [[Abaqus Progressive Damage and Failure]] supplies damage evolution and element deletion context.
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- [[Abaqus Fracture and Enriched Discontinuity Modeling]] is the broader crack and interface failure workflow.
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- [[Abaqus Material Library and Data Definition]] supplies material behavior for cohesive or gasket response.
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|
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## Sources
|
||||
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]
|
||||
|
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---
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||||
type: concept
|
||||
title: "Abaqus Connector Elements and Behaviors"
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||||
complexity: advanced
|
||||
domain: computational-mechanics
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||||
created: 2026-06-01
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||||
updated: 2026-06-01
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||||
address: c-000110
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aliases:
|
||||
- Abaqus connector elements
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||||
- Abaqus connector behavior
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- CONN2D2 and CONN3D2
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tags:
|
||||
- concept
|
||||
- finite-element-method
|
||||
- abaqus
|
||||
- connector-elements
|
||||
- nonlinear-analysis
|
||||
status: current
|
||||
related:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]"
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]"
|
||||
- "[[Abaqus Element Selection and Formulation]]"
|
||||
- "[[Abaqus Loads and Predefined Fields]]"
|
||||
- "[[Abaqus Prescribed Conditions and Amplitudes]]"
|
||||
- "[[Nonlinear Finite Element Analysis]]"
|
||||
- "[[Finite Element Contact Formulation]]"
|
||||
- "[[Abaqus Progressive Damage and Failure]]"
|
||||
sources:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]"
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]"
|
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---
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|
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# Abaqus Connector Elements and Behaviors
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## Definition
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Abaqus connector elements are two-node or node-to-ground elements that impose, release, actuate, or assign behavior to relative motion components between two points.
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## How They Work
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The connector element topology is simple, but the connection-type library determines which relative translational and rotational components are constrained or available for behavior. Connector behavior can include elasticity, damping, friction, plasticity, damage, stops, locks, failure, actuation, and coupled force-displacement functions.
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This makes connectors useful for joints, bushings, hinges, fasteners, linkages, control devices, and idealized mechanisms where a full geometric contact or continuum model would be excessive.
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[[Abaqus-Analysis-User-s-Guide-Volume-V|Volume V]] connects connectors to the prescribed-condition layer: connector elements can receive prescribed loads or motions, including actuated behavior controlled by amplitudes or procedure-specific histories.
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## Why It Matters
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Connectors are compact nonlinear models. They can represent a physical joint with a small number of degrees of freedom, but their local coordinate systems, available components, and behavior laws define the actual mechanics.
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## Connections
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|
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- [[Nonlinear Finite Element Analysis]] supplies the path-dependent and failure context for connector behavior.
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- [[Abaqus Progressive Damage and Failure]] connects to connector damage and failure behavior.
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- [[Finite Element Contact Formulation]] is an alternative when interaction geometry, rather than a point-to-point relation, controls the response.
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- [[Abaqus Loads and Predefined Fields]] covers connector loads and motions as prescribed conditions.
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- [[Abaqus Element Selection and Formulation]] places connector elements beside springs, dashpots, and other discrete element families.
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|
||||
## Sources
|
||||
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]
|
||||
@@ -4,7 +4,7 @@ title: "Abaqus Constitutive Integration"
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||||
complexity: advanced
|
||||
domain: computational-mechanics
|
||||
created: 2026-05-29
|
||||
updated: 2026-05-29
|
||||
updated: 2026-06-01
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||||
address: c-000059
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||||
aliases:
|
||||
- Abaqus material integration
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@@ -19,11 +19,17 @@ tags:
|
||||
status: current
|
||||
related:
|
||||
- "[[Abaqus Theory Manual]]"
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]]"
|
||||
- "[[Abaqus Analysis Procedures]]"
|
||||
- "[[Nonlinear Finite Element Analysis]]"
|
||||
- "[[Hybrid Incompressible Elements]]"
|
||||
- "[[Abaqus Material Library and Data Definition]]"
|
||||
- "[[Abaqus Metal Plasticity Models]]"
|
||||
- "[[Abaqus Progressive Damage and Failure]]"
|
||||
- "[[Abaqus User-Defined Material Behavior]]"
|
||||
sources:
|
||||
- "[[Abaqus Theory Manual]]"
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]]"
|
||||
---
|
||||
|
||||
# Abaqus Constitutive Integration
|
||||
@@ -38,6 +44,8 @@ Element routines pass kinematic information to material calculations at integrat
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For plasticity, the manual organizes material behavior through yield functions, flow potentials, hardening laws, rate dependence, and stress integration. A backward-Euler style integration with consistent linearization is central because the quality of the material tangent strongly affects Newton convergence.
|
||||
|
||||
[[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]] adds the analyst-facing side of this same layer. It shows how built-in material behaviors are selected and combined, how tabular material data are supplied, how damage and state variables are exposed, and how user materials must return stresses, state variables, and, in Abaqus/Standard, a material Jacobian.
|
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|
||||
## Why It Matters
|
||||
|
||||
Constitutive integration is where material theory becomes finite element stiffness and residual terms. Even if the mesh and global solver are appropriate, a poor stress update or inconsistent tangent can cause convergence problems, path errors, or incorrect dissipation.
|
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@@ -47,8 +55,10 @@ Constitutive integration is where material theory becomes finite element stiffne
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- [[Nonlinear Finite Element Analysis]] supplies the global residual and tangent iteration that depend on material-point updates.
|
||||
- [[Abaqus Analysis Procedures]] determines when and how material states are advanced.
|
||||
- [[Hybrid Incompressible Elements]] relies on constitutive separation of deviatoric and pressure-like response.
|
||||
- [[Abaqus Material Library and Data Definition]] supplies the input-level material blocks that drive constitutive updates.
|
||||
- [[Abaqus User-Defined Material Behavior]] is the direct extension point for custom stress updates and tangents.
|
||||
|
||||
## Sources
|
||||
|
||||
- [[Abaqus Theory Manual]]
|
||||
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]]
|
||||
|
||||
@@ -0,0 +1,57 @@
|
||||
---
|
||||
type: concept
|
||||
title: "Abaqus Contact Diagnostics and Modeling Difficulties"
|
||||
complexity: advanced
|
||||
domain: computational-mechanics
|
||||
created: 2026-06-01
|
||||
updated: 2026-06-01
|
||||
address: c-000126
|
||||
aliases:
|
||||
- Abaqus contact diagnostics
|
||||
- Abaqus contact modeling difficulties
|
||||
- Abaqus initial overclosure diagnostics
|
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tags:
|
||||
- concept
|
||||
- finite-element-method
|
||||
- abaqus
|
||||
- contact
|
||||
- diagnostics
|
||||
status: current
|
||||
related:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]"
|
||||
- "[[Abaqus Contact Interaction Definition]]"
|
||||
- "[[Abaqus Contact Formulations and Enforcement]]"
|
||||
- "[[Abaqus Embedded Elements and Overconstraints]]"
|
||||
- "[[Abaqus Output Database and Results Files]]"
|
||||
- "[[Abaqus Nonlinear Solution Control]]"
|
||||
sources:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]"
|
||||
---
|
||||
|
||||
# Abaqus Contact Diagnostics and Modeling Difficulties
|
||||
|
||||
## Definition
|
||||
|
||||
Abaqus contact diagnostics and modeling difficulties are the checks, output variables, and modeling symptoms used to identify contact setup and numerical enforcement problems.
|
||||
|
||||
## How They Work
|
||||
|
||||
Diagnostics report initial overclosures, nodal adjustments, crossed surfaces, surface normals, contact status, and other contact setup details through message, status, data, output database, and visualization workflows depending on product and contact algorithm.
|
||||
|
||||
Common difficulties include initial overclosure, duplicate or crossed surfaces, inadequate master surfaces, poor surface discretization, contact at single points or corners, coarse second-order surfaces, redundant constraints, conflicts with boundary conditions or MPCs, large mass mismatch, rigid-to-rigid penalty sensitivity, and finite-sliding behavior near symmetry planes.
|
||||
|
||||
## Why It Matters
|
||||
|
||||
Contact problems often fail because the interaction geometry or constraints are inconsistent, not because the material law is wrong. Diagnostics provide a way to distinguish modeling errors from solver-control issues.
|
||||
|
||||
## Connections
|
||||
|
||||
- [[Abaqus Contact Formulations and Enforcement]] explains why different formulations produce different diagnostic symptoms.
|
||||
- [[Abaqus Embedded Elements and Overconstraints]] covers broader constraint conflicts.
|
||||
- [[Abaqus Output Database and Results Files]] supplies the files and fields used to inspect contact diagnostics.
|
||||
- [[Abaqus Nonlinear Solution Control]] is affected when contact difficulties cause cutbacks or nonconvergence.
|
||||
|
||||
## Sources
|
||||
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]
|
||||
|
||||
@@ -0,0 +1,58 @@
|
||||
---
|
||||
type: concept
|
||||
title: "Abaqus Contact Formulations and Enforcement"
|
||||
complexity: advanced
|
||||
domain: computational-mechanics
|
||||
created: 2026-06-01
|
||||
updated: 2026-06-01
|
||||
address: c-000125
|
||||
aliases:
|
||||
- Abaqus contact enforcement
|
||||
- Abaqus contact formulations
|
||||
- Abaqus penalty contact
|
||||
tags:
|
||||
- concept
|
||||
- finite-element-method
|
||||
- abaqus
|
||||
- contact
|
||||
- nonlinear-analysis
|
||||
- constraints
|
||||
status: current
|
||||
related:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]"
|
||||
- "[[Abaqus Contact Interaction Definition]]"
|
||||
- "[[Abaqus Contact Property Models]]"
|
||||
- "[[Abaqus Contact Diagnostics and Modeling Difficulties]]"
|
||||
- "[[Finite Element Contact Formulation]]"
|
||||
- "[[Abaqus Nonlinear Solution Control]]"
|
||||
sources:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]"
|
||||
---
|
||||
|
||||
# Abaqus Contact Formulations and Enforcement
|
||||
|
||||
## Definition
|
||||
|
||||
Abaqus contact formulations and enforcement methods determine how contact kinematics are discretized and how nonpenetration and interface laws are imposed numerically.
|
||||
|
||||
## How They Work
|
||||
|
||||
Contact formulations include node-to-surface, surface-to-surface, edge-to-surface, edge-to-edge, vertex-to-surface, small-sliding, and finite-sliding tracking. The formulation affects contact normals, opening distance, shell thickness treatment, master/slave assignment, and behavior near corners or symmetry planes.
|
||||
|
||||
Constraint enforcement methods include direct Lagrange multiplier enforcement, penalty enforcement, and augmented Lagrange enforcement depending on product, contact definition, and interaction behavior. Penalty methods allow controlled penetration; direct methods enforce constraints more strictly but can interact strongly with other constraints.
|
||||
|
||||
## Why It Matters
|
||||
|
||||
Two models with the same surfaces and friction law can differ if the contact formulation or enforcement method changes. These choices affect robustness, smoothness, contact pressure oscillation, overconstraint sensitivity, and computational cost.
|
||||
|
||||
## Connections
|
||||
|
||||
- [[Abaqus Contact Interaction Definition]] chooses general contact or contact pairs before formulation details are applied.
|
||||
- [[Abaqus Contact Property Models]] supplies the interface law being enforced.
|
||||
- [[Abaqus Contact Diagnostics and Modeling Difficulties]] describes symptoms of poor formulation or enforcement choices.
|
||||
- [[Abaqus Nonlinear Solution Control]] is affected by contact enforcement, stabilization, and cutbacks.
|
||||
|
||||
## Sources
|
||||
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]
|
||||
|
||||
@@ -0,0 +1,59 @@
|
||||
---
|
||||
type: concept
|
||||
title: "Abaqus Contact Interaction Definition"
|
||||
complexity: advanced
|
||||
domain: computational-mechanics
|
||||
created: 2026-06-01
|
||||
updated: 2026-06-01
|
||||
address: c-000123
|
||||
aliases:
|
||||
- Abaqus general contact
|
||||
- Abaqus contact pairs
|
||||
- Abaqus contact definitions
|
||||
tags:
|
||||
- concept
|
||||
- finite-element-method
|
||||
- abaqus
|
||||
- contact
|
||||
- interactions
|
||||
status: current
|
||||
related:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]"
|
||||
- "[[Finite Element Contact Formulation]]"
|
||||
- "[[Abaqus Surface and Assembly Modeling]]"
|
||||
- "[[Abaqus Contact Property Models]]"
|
||||
- "[[Abaqus Contact Formulations and Enforcement]]"
|
||||
- "[[Abaqus Standard Contact Elements]]"
|
||||
sources:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]"
|
||||
---
|
||||
|
||||
# Abaqus Contact Interaction Definition
|
||||
|
||||
## Definition
|
||||
|
||||
Abaqus contact interaction definition is the workflow for declaring which surfaces may interact and whether the interaction is handled by general contact, contact pairs, or contact elements.
|
||||
|
||||
## How It Works
|
||||
|
||||
General contact defines a broad contact domain and then assigns surface attributes and contact properties as needed. Contact pairs define pairwise interactions between specified surfaces. Both approaches use surfaces, but they differ in default formulation, shell thickness treatment, master/slave handling, initial overclosure handling, and product-specific capability.
|
||||
|
||||
In Abaqus/Standard, general contact and contact pairs share many underlying algorithms, and an analysis can include both. Contact pairs can still be needed for analytical rigid surfaces, node-based surfaces, small-sliding contact, tied contact, pressure-penetration loading, or local controls.
|
||||
|
||||
In Abaqus/Explicit, general contact and contact pairs are separate algorithms. General contact allows broad surface types, eroding bodies, Eulerian-Lagrangian contact, DEM/SPH contact, and simplified setup, while contact pairs provide some behaviors unavailable in general contact.
|
||||
|
||||
## Why It Matters
|
||||
|
||||
Contact setup controls which bodies can interact, which surfaces carry thickness or offsets, how initial overclosures are treated, and which numerical algorithm enforces impenetrability.
|
||||
|
||||
## Connections
|
||||
|
||||
- [[Finite Element Contact Formulation]] provides the general interface-modeling context.
|
||||
- [[Abaqus Contact Property Models]] defines what happens once surfaces interact.
|
||||
- [[Abaqus Contact Formulations and Enforcement]] explains the numerical enforcement branch.
|
||||
- [[Abaqus Standard Contact Elements]] covers specialized contact elements when surface-based contact is not appropriate.
|
||||
|
||||
## Sources
|
||||
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]
|
||||
|
||||
@@ -0,0 +1,58 @@
|
||||
---
|
||||
type: concept
|
||||
title: "Abaqus Contact Property Models"
|
||||
complexity: advanced
|
||||
domain: computational-mechanics
|
||||
created: 2026-06-01
|
||||
updated: 2026-06-01
|
||||
address: c-000124
|
||||
aliases:
|
||||
- Abaqus contact properties
|
||||
- Abaqus frictional behavior
|
||||
- Abaqus pressure-overclosure
|
||||
tags:
|
||||
- concept
|
||||
- finite-element-method
|
||||
- abaqus
|
||||
- contact
|
||||
- friction
|
||||
- interface-modeling
|
||||
status: current
|
||||
related:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]"
|
||||
- "[[Abaqus Contact Interaction Definition]]"
|
||||
- "[[Abaqus Contact Formulations and Enforcement]]"
|
||||
- "[[Finite Element Contact Formulation]]"
|
||||
- "[[Abaqus Cohesive and Gasket Elements]]"
|
||||
- "[[Abaqus Multiphysics Coupling and Co-simulation]]"
|
||||
sources:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]"
|
||||
---
|
||||
|
||||
# Abaqus Contact Property Models
|
||||
|
||||
## Definition
|
||||
|
||||
Abaqus contact property models define the normal, tangential, thermal, electrical, pore-fluid, and user-defined behavior of interacting surfaces.
|
||||
|
||||
## How They Work
|
||||
|
||||
By default, contact resists penetration in the normal direction. A contact property can add hard or softened pressure-overclosure behavior, contact damping, friction, user-defined interfacial constitutive behavior, breakable bonds, pressure penetration, surface-based cohesive behavior, thermal conductance, heat generation, electrical conductance, or pore-fluid transfer.
|
||||
|
||||
The contact property is assigned to a contact pair or to a region of a general contact domain. This separates the geometric contact definition from the interface law.
|
||||
|
||||
## Why It Matters
|
||||
|
||||
The contact surfaces determine where interaction can occur; the contact property determines what interaction means physically. Friction, damping, cohesive behavior, and coupled-field transfer can dominate nonlinear response.
|
||||
|
||||
## Connections
|
||||
|
||||
- [[Finite Element Contact Formulation]] gives the contact constraint context.
|
||||
- [[Abaqus Contact Interaction Definition]] defines the surfaces or domain to which properties are assigned.
|
||||
- [[Abaqus Contact Formulations and Enforcement]] determines how the property is enforced numerically.
|
||||
- [[Abaqus Cohesive and Gasket Elements]] is the element-based interface alternative to surface-based cohesive behavior.
|
||||
|
||||
## Sources
|
||||
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]
|
||||
|
||||
@@ -0,0 +1,64 @@
|
||||
---
|
||||
type: concept
|
||||
title: "Abaqus Continuum Element Families"
|
||||
complexity: advanced
|
||||
domain: computational-mechanics
|
||||
created: 2026-06-01
|
||||
updated: 2026-06-01
|
||||
address: c-000106
|
||||
aliases:
|
||||
- Abaqus continuum elements
|
||||
- Abaqus solid elements
|
||||
- Abaqus fluid continuum elements
|
||||
tags:
|
||||
- concept
|
||||
- finite-element-method
|
||||
- abaqus
|
||||
- continuum-elements
|
||||
- solid-elements
|
||||
status: current
|
||||
related:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]"
|
||||
- "[[Abaqus Element Selection and Formulation]]"
|
||||
- "[[Isoparametric Linear Solid Elements]]"
|
||||
- "[[Isoparametric Finite Elements]]"
|
||||
- "[[Reduced Integration and Hourglass Control]]"
|
||||
- "[[Hybrid Incompressible Elements]]"
|
||||
- "[[Plane Stress and Plane Strain Elements]]"
|
||||
- "[[Axisymmetric Finite Elements]]"
|
||||
sources:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]"
|
||||
---
|
||||
|
||||
# Abaqus Continuum Element Families
|
||||
|
||||
## Definition
|
||||
|
||||
Abaqus continuum element families model volume or area continua with translational and field degrees of freedom rather than structural-section degrees of freedom.
|
||||
|
||||
## How They Work
|
||||
|
||||
The general-purpose continuum library includes one-dimensional links, two-dimensional plane stress and plane strain solids, three-dimensional solids, cylindrical solids, axisymmetric solids, and axisymmetric elements that allow nonlinear asymmetric deformation. Common stress/displacement examples include tetrahedra, wedges, pyramids, and bricks such as `C3D4`, `C3D6`, `C3D8`, `C3D8R`, `C3D8I`, and `C3D10`.
|
||||
|
||||
Many continuum families have variants for coupled fields and special formulations. Suffixes identify thermally coupled, pore-pressure, piezoelectric, hybrid, reduced-integration, incompatible-mode, and improved stress-visualization behavior. The same geometric topology can therefore support different analysis physics.
|
||||
|
||||
The volume also covers fluid continuum elements for Abaqus/CFD, infinite elements for unbounded domains, acoustic elements, and warping elements for beam-section calculations.
|
||||
|
||||
## Practical Selection Notes
|
||||
|
||||
- First-order fully integrated solids can lock in bending-dominated or incompressible limits.
|
||||
- First-order reduced-integration solids can be efficient but require hourglass control and adequate mesh refinement.
|
||||
- Hybrid elements are important for incompressible or nearly incompressible material behavior.
|
||||
- Modified tetrahedral elements are often preferable to constant-stress tetrahedra when tetrahedral meshing is unavoidable.
|
||||
|
||||
## Connections
|
||||
|
||||
- [[Isoparametric Linear Solid Elements]] supplies the basic 3D continuum interpolation pattern.
|
||||
- [[Plane Stress and Plane Strain Elements]] and [[Axisymmetric Finite Elements]] are reduced-dimensional continuum abstractions.
|
||||
- [[Reduced Integration and Hourglass Control]] and [[Hybrid Incompressible Elements]] describe the main formulation variants.
|
||||
- [[Abaqus Fluid Acoustic Eulerian and Particle Elements]] covers continuum-adjacent acoustic, fluid, and particle families.
|
||||
|
||||
## Sources
|
||||
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]
|
||||
|
||||
@@ -0,0 +1,56 @@
|
||||
---
|
||||
type: concept
|
||||
title: "Abaqus Elastic Material Models"
|
||||
complexity: intermediate
|
||||
domain: computational-mechanics
|
||||
created: 2026-06-01
|
||||
updated: 2026-06-01
|
||||
address: c-000094
|
||||
aliases:
|
||||
- Abaqus elasticity
|
||||
- Abaqus linear elasticity
|
||||
- Abaqus porous elasticity
|
||||
- Abaqus hypoelasticity
|
||||
tags:
|
||||
- concept
|
||||
- finite-element-method
|
||||
- abaqus
|
||||
- elasticity
|
||||
- materials
|
||||
status: current
|
||||
related:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]]"
|
||||
- "[[Abaqus Material Library and Data Definition]]"
|
||||
- "[[Abaqus Constitutive Integration]]"
|
||||
- "[[Plane Stress and Plane Strain Elements]]"
|
||||
- "[[Hybrid Incompressible Elements]]"
|
||||
sources:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]]"
|
||||
---
|
||||
|
||||
# Abaqus Elastic Material Models
|
||||
|
||||
## Definition
|
||||
|
||||
Abaqus elastic material models define recoverable mechanical response before, or apart from, irreversible material behavior.
|
||||
|
||||
## How It Works
|
||||
|
||||
The guide organizes elastic behavior into linear elasticity, modified elastic response, porous elasticity, and hypoelasticity. Linear elasticity can be isotropic, orthotropic, transversely isotropic, fully anisotropic, plane-stress orthotropic, warping-element specific, or traction-separation based for cohesive response.
|
||||
|
||||
Special elastic variants capture modeling assumptions that are not ordinary symmetric stiffness matrices. No-compression or no-tension behavior removes stiffness under selected stress states. Plane-stress orthotropic failure measures provide failure indicators for orthotropic lamina-like behavior. Porous elasticity separates volumetric and shear behavior for porous materials, while hypoelasticity defines the rate of stress change from a tangent modulus matrix and is intended for small elastic strains under monotonic loading.
|
||||
|
||||
## Why It Matters
|
||||
|
||||
Elasticity is often the baseline behavior that plasticity, damage, viscoelasticity, thermal expansion, and user material models build on. Choosing the wrong elastic assumption can make later nonlinear behavior look incorrect even when the solver is functioning normally.
|
||||
|
||||
## Connections
|
||||
|
||||
- [[Plane Stress and Plane Strain Elements]] depend on the selected elastic idealization.
|
||||
- [[Hybrid Incompressible Elements]] become important when elastic or hyperelastic behavior is nearly incompressible.
|
||||
- [[Abaqus Constitutive Integration]] updates stresses and material tangents from the elastic or elastic-plastic model.
|
||||
|
||||
## Sources
|
||||
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]]
|
||||
|
||||
@@ -0,0 +1,57 @@
|
||||
---
|
||||
type: concept
|
||||
title: "Abaqus Element Indexes and Naming Conventions"
|
||||
complexity: intermediate
|
||||
domain: computational-mechanics
|
||||
created: 2026-06-01
|
||||
updated: 2026-06-01
|
||||
address: c-000115
|
||||
aliases:
|
||||
- Abaqus element index
|
||||
- Abaqus element naming conventions
|
||||
- Abaqus element type names
|
||||
tags:
|
||||
- concept
|
||||
- finite-element-method
|
||||
- abaqus
|
||||
- element-library
|
||||
- naming
|
||||
status: current
|
||||
related:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]"
|
||||
- "[[Abaqus Element Selection and Formulation]]"
|
||||
- "[[Abaqus Element Library]]"
|
||||
- "[[Abaqus Continuum Element Families]]"
|
||||
- "[[Abaqus Structural Element Families]]"
|
||||
sources:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]"
|
||||
---
|
||||
|
||||
# Abaqus Element Indexes and Naming Conventions
|
||||
|
||||
## Definition
|
||||
|
||||
Abaqus element indexes and naming conventions are the product-specific lookup system for mapping element type names to families, topology, formulation, integration, and manual sections.
|
||||
|
||||
## How It Works
|
||||
|
||||
An Abaqus element name usually begins with a family prefix and includes dimensionality or topology information. Examples include `C` for continuum, `S` for shell, `B` for beam, `T` for truss, `COH` for cohesive, `CONN` for connector, `AC` for acoustic, `EC` for Eulerian, `PD` for discrete particle, and `PC` for continuum particle.
|
||||
|
||||
Suffixes and trailing letters often identify formulation variants. `R` commonly marks reduced integration, `H` marks hybrid pressure treatment, `I` marks incompatible modes, and field letters such as `T`, `P`, or `E` identify coupled temperature, pore-pressure, or piezoelectric variants in many continuum families.
|
||||
|
||||
Volume IV includes separate indexes for Abaqus/Standard, Abaqus/Explicit, and Abaqus/CFD. Some internal element names may appear in output databases or data files even though they are not listed for user selection.
|
||||
|
||||
## Why It Matters
|
||||
|
||||
The element index is the fastest way to prevent a modeling mismatch. It confirms whether the intended topology, physics, formulation, and product are actually available before the analyst commits to a mesh and procedure.
|
||||
|
||||
## Connections
|
||||
|
||||
- [[Abaqus Element Selection and Formulation]] explains what the name is trying to encode.
|
||||
- [[Abaqus Continuum Element Families]] and [[Abaqus Structural Element Families]] cover the largest element-name families.
|
||||
- [[Abaqus Element Library]] is the theory and workflow context for the indexes.
|
||||
|
||||
## Sources
|
||||
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]
|
||||
|
||||
@@ -4,7 +4,7 @@ title: "Abaqus Element Library"
|
||||
complexity: advanced
|
||||
domain: computational-mechanics
|
||||
created: 2026-05-29
|
||||
updated: 2026-05-29
|
||||
updated: 2026-06-01
|
||||
address: c-000056
|
||||
aliases:
|
||||
- ABAQUS element library
|
||||
@@ -18,7 +18,12 @@ status: current
|
||||
related:
|
||||
- "[[Abaqus Theory Manual]]"
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-I|Abaqus Analysis User's Guide Volume I]]"
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]"
|
||||
- "[[ABAQUS]]"
|
||||
- "[[Abaqus Element Selection and Formulation]]"
|
||||
- "[[Abaqus Continuum Element Families]]"
|
||||
- "[[Abaqus Structural Element Families]]"
|
||||
- "[[Abaqus Element Indexes and Naming Conventions]]"
|
||||
- "[[Abaqus Spatial Model Definition]]"
|
||||
- "[[Abaqus Surface and Assembly Modeling]]"
|
||||
- "[[Isoparametric Finite Elements]]"
|
||||
@@ -28,6 +33,7 @@ related:
|
||||
sources:
|
||||
- "[[Abaqus Theory Manual]]"
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-I|Abaqus Analysis User's Guide Volume I]]"
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]"
|
||||
---
|
||||
|
||||
# Abaqus Element Library
|
||||
@@ -44,16 +50,22 @@ The library includes continuum solids, infinite elements, membranes, trusses, be
|
||||
|
||||
The user guide adds the input-file side of the library: an element definition pairs an element number and connectivity with an element type, then uses element sets, sections, surfaces, and assembly instances to connect that formulation to materials, loads, constraints, and output.
|
||||
|
||||
[[Abaqus-Analysis-User-s-Guide-Volume-IV|Volume IV]] adds the selection side of the library. It organizes elements by family, active degrees of freedom, number of nodes, interpolation order, formulation, integration rule, section requirements, and product availability.
|
||||
|
||||
## Formulation Choices
|
||||
|
||||
- Full integration improves rank and suppresses zero-energy modes but may lock in bending or incompressible limits.
|
||||
- Reduced integration can lower cost and improve some strain estimates but may introduce hourglass modes.
|
||||
- Selective reduced integration and hybrid elements address volumetric locking and incompressibility.
|
||||
- Second-order elements are often preferred for smooth elliptic problems, while first-order or enriched elements are common in localization, contact, and severe nonlinearity.
|
||||
- Element names encode practical choices: `R` commonly marks reduced integration, `H` marks hybrid pressure treatment, and family prefixes identify continuum, shell, beam, connector, cohesive, acoustic, Eulerian, and particle elements.
|
||||
|
||||
## Connections
|
||||
|
||||
- [[Isoparametric Finite Elements]] gives the common mapping and interpolation language.
|
||||
- [[Abaqus Element Selection and Formulation]] explains how family, degrees of freedom, interpolation, formulation, and integration become a concrete element choice.
|
||||
- [[Abaqus Continuum Element Families]] and [[Abaqus Structural Element Families]] split the largest element families by modeling abstraction.
|
||||
- [[Abaqus Element Indexes and Naming Conventions]] decodes the element-name and product-availability lookup layer.
|
||||
- [[Reduced Integration and Hourglass Control]] explains the main under-integration tradeoff.
|
||||
- [[Hybrid Incompressible Elements]] explains the mixed treatment used when displacement-only elements become too stiff.
|
||||
- [[Solid Element Stiffness Integration]] is the local stiffness assembly case for three-dimensional continuum elements.
|
||||
@@ -64,3 +76,4 @@ The user guide adds the input-file side of the library: an element definition pa
|
||||
|
||||
- [[Abaqus Theory Manual]]
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-I|Abaqus Analysis User's Guide Volume I]]
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]
|
||||
|
||||
@@ -0,0 +1,61 @@
|
||||
---
|
||||
type: concept
|
||||
title: "Abaqus Element Selection and Formulation"
|
||||
complexity: advanced
|
||||
domain: computational-mechanics
|
||||
created: 2026-06-01
|
||||
updated: 2026-06-01
|
||||
address: c-000105
|
||||
aliases:
|
||||
- Abaqus element selection
|
||||
- Abaqus element formulation
|
||||
- element formulation suffixes
|
||||
tags:
|
||||
- concept
|
||||
- finite-element-method
|
||||
- abaqus
|
||||
- element-formulation
|
||||
- element-selection
|
||||
status: current
|
||||
related:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]"
|
||||
- "[[Abaqus Element Library]]"
|
||||
- "[[Abaqus Element Indexes and Naming Conventions]]"
|
||||
- "[[Reduced Integration and Hourglass Control]]"
|
||||
- "[[Hybrid Incompressible Elements]]"
|
||||
- "[[Abaqus Spatial Model Definition]]"
|
||||
- "[[Abaqus Analysis Procedures]]"
|
||||
sources:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]"
|
||||
---
|
||||
|
||||
# Abaqus Element Selection and Formulation
|
||||
|
||||
## Definition
|
||||
|
||||
Abaqus element selection and formulation is the workflow for choosing an element family, degrees of freedom, interpolation order, mathematical formulation, and integration rule that match the analysis procedure and modeling abstraction.
|
||||
|
||||
## How It Works
|
||||
|
||||
Every Abaqus element type encodes several decisions: family, active degrees of freedom, number of nodes, interpolation order, formulation, and integration rule. A name such as `C3D8R` identifies a continuum brick with eight nodes and reduced integration; `C3D8H` identifies a hybrid continuum brick for incompressible behavior; `S4R` identifies a four-node reduced-integration shell.
|
||||
|
||||
Formulation choices matter because they change the element's numerical behavior. Most stress/displacement elements are Lagrangian, so the mesh deforms with the material. Abaqus/Explicit also offers Eulerian elements for material flow through a fixed spatial mesh, and ALE adaptive meshing allows mesh motion to differ from material motion.
|
||||
|
||||
Abaqus also filters element usefulness by product and analysis type. Stress/displacement, heat-transfer, pore-pressure, acoustic, electromagnetic, fluid, pipe, connector, and user-defined elements activate different degrees of freedom and are not interchangeable across all procedures.
|
||||
|
||||
## Why It Matters
|
||||
|
||||
Element selection is a modeling decision, not a catalog lookup. A wrong element can lock, hourglass, converge poorly, fail to represent the intended physics, or be ignored by an incompatible analysis procedure.
|
||||
|
||||
## Connections
|
||||
|
||||
- [[Abaqus Element Library]] is the broader library context.
|
||||
- [[Abaqus Element Indexes and Naming Conventions]] decodes element names and product availability.
|
||||
- [[Reduced Integration and Hourglass Control]] explains the `R` branch of many element names.
|
||||
- [[Hybrid Incompressible Elements]] explains the `H` branch used for incompressible or inextensible behavior.
|
||||
- [[Abaqus Spatial Model Definition]] is where element type and connectivity enter the model.
|
||||
|
||||
## Sources
|
||||
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]
|
||||
|
||||
@@ -0,0 +1,57 @@
|
||||
---
|
||||
type: concept
|
||||
title: "Abaqus Embedded Elements and Overconstraints"
|
||||
complexity: advanced
|
||||
domain: computational-mechanics
|
||||
created: 2026-06-01
|
||||
updated: 2026-06-01
|
||||
address: c-000122
|
||||
aliases:
|
||||
- Abaqus embedded elements
|
||||
- Abaqus overconstraint checks
|
||||
- Abaqus element end release
|
||||
tags:
|
||||
- concept
|
||||
- finite-element-method
|
||||
- abaqus
|
||||
- constraints
|
||||
- diagnostics
|
||||
status: current
|
||||
related:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]"
|
||||
- "[[Abaqus Kinematic Constraints and MPCs]]"
|
||||
- "[[Abaqus Surface-Based Constraints and Couplings]]"
|
||||
- "[[Abaqus Contact Diagnostics and Modeling Difficulties]]"
|
||||
- "[[Abaqus Nonlinear Solution Control]]"
|
||||
sources:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]"
|
||||
---
|
||||
|
||||
# Abaqus Embedded Elements and Overconstraints
|
||||
|
||||
## Definition
|
||||
|
||||
Abaqus embedded elements and overconstraint checks cover two related modeling issues: embedding one discretization in another and detecting redundant or conflicting constraints.
|
||||
|
||||
## How They Work
|
||||
|
||||
Embedded element constraints tie embedded nodes to host elements so that reinforcement, inclusions, or smaller features can move with a surrounding host mesh without conforming mesh topology.
|
||||
|
||||
Element end release removes selected moment or force transfer at structural element ends. It is a local release of kinematic or force continuity rather than a global constraint equation.
|
||||
|
||||
Overconstraint checks diagnose redundant boundary conditions, MPCs, tie constraints, contact constraints, couplings, rigid body constraints, and embedded constraints. Abaqus can sometimes remove redundant constraints automatically, but the resulting reactions or contact forces may still require interpretation.
|
||||
|
||||
## Why It Matters
|
||||
|
||||
Overconstraints are a common source of convergence problems, indeterminate reactions, and noisy contact response. They often appear only after multiple modeling features are combined.
|
||||
|
||||
## Connections
|
||||
|
||||
- [[Abaqus Kinematic Constraints and MPCs]] and [[Abaqus Surface-Based Constraints and Couplings]] provide the constraint types that can conflict.
|
||||
- [[Abaqus Contact Diagnostics and Modeling Difficulties]] covers contact-specific constraint conflicts.
|
||||
- [[Abaqus Nonlinear Solution Control]] is affected when constraint conflicts cause cutbacks or failed equilibrium iterations.
|
||||
|
||||
## Sources
|
||||
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]
|
||||
|
||||
@@ -4,7 +4,7 @@ title: "Abaqus Eulerian and Particle Methods"
|
||||
complexity: advanced
|
||||
domain: computational-mechanics
|
||||
created: 2026-05-29
|
||||
updated: 2026-05-29
|
||||
updated: 2026-06-01
|
||||
address: c-000088
|
||||
aliases:
|
||||
- Abaqus Eulerian analysis
|
||||
@@ -19,12 +19,15 @@ tags:
|
||||
status: current
|
||||
related:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-II|Abaqus Analysis User's Guide Volume II]]"
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]"
|
||||
- "[[Abaqus Fluid Acoustic Eulerian and Particle Elements]]"
|
||||
- "[[Abaqus Adaptivity and Mesh Replacement]]"
|
||||
- "[[Direct Time Integration Methods]]"
|
||||
- "[[Finite Element Contact Formulation]]"
|
||||
- "[[Finite Element Heat Transfer and Field Problems]]"
|
||||
sources:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-II|Abaqus Analysis User's Guide Volume II]]"
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]"
|
||||
---
|
||||
|
||||
# Abaqus Eulerian and Particle Methods
|
||||
@@ -41,6 +44,8 @@ The discrete element method represents large numbers of rigid spherical particle
|
||||
|
||||
Smoothed particle hydrodynamics represents a continuum with particles and kernel interpolation instead of a connected finite element mesh. It is fully Lagrangian and useful for large deformation, free surfaces, and fluid-like continuum motion, though it can be less accurate than finite elements when deformation is moderate.
|
||||
|
||||
[[Abaqus-Analysis-User-s-Guide-Volume-IV|Volume IV]] supplies the element-library side: `PD3D` is the discrete particle element for DEM workflows, `PC3D` is the continuum particle element for SPH workflows, and Eulerian element names such as `EC3D8R` identify multimaterial Eulerian bricks in Abaqus/Explicit.
|
||||
|
||||
## Why It Matters
|
||||
|
||||
These methods are alternatives when a conventional Lagrangian mesh would distort, lose accuracy, or be the wrong abstraction. They trade finite element mesh connectivity for volume-fraction transport, contact-dominated particle motion, or mesh-free interpolation.
|
||||
@@ -48,10 +53,11 @@ These methods are alternatives when a conventional Lagrangian mesh would distort
|
||||
## Connections
|
||||
|
||||
- [[Abaqus Adaptivity and Mesh Replacement]] is the mesh-smoothing/remeshing alternative for large deformation.
|
||||
- [[Abaqus Fluid Acoustic Eulerian and Particle Elements]] covers the element families behind Eulerian, DEM, SPH, acoustic, and pipe-flow workflows.
|
||||
- [[Finite Element Contact Formulation]] matters for Eulerian-Lagrangian and DEM contact.
|
||||
- [[Direct Time Integration Methods]] supplies the explicit dynamics context used by these methods.
|
||||
|
||||
## Sources
|
||||
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-II|Abaqus Analysis User's Guide Volume II]]
|
||||
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]
|
||||
|
||||
@@ -0,0 +1,62 @@
|
||||
---
|
||||
type: concept
|
||||
title: "Abaqus Fluid Acoustic Eulerian and Particle Elements"
|
||||
complexity: advanced
|
||||
domain: computational-mechanics
|
||||
created: 2026-06-01
|
||||
updated: 2026-06-01
|
||||
address: c-000113
|
||||
aliases:
|
||||
- Abaqus acoustic elements
|
||||
- Abaqus Eulerian elements
|
||||
- Abaqus particle elements
|
||||
- Abaqus fluid pipe elements
|
||||
tags:
|
||||
- concept
|
||||
- finite-element-method
|
||||
- abaqus
|
||||
- eulerian
|
||||
- acoustic
|
||||
- particle-methods
|
||||
- fluid-elements
|
||||
status: current
|
||||
related:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]"
|
||||
- "[[Abaqus Eulerian and Particle Methods]]"
|
||||
- "[[Abaqus Continuum Element Families]]"
|
||||
- "[[Abaqus Multiphysics Coupling and Co-simulation]]"
|
||||
- "[[Finite Element Heat Transfer and Field Problems]]"
|
||||
- "[[Direct Time Integration Methods]]"
|
||||
sources:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]"
|
||||
---
|
||||
|
||||
# Abaqus Fluid Acoustic Eulerian and Particle Elements
|
||||
|
||||
## Definition
|
||||
|
||||
Abaqus fluid, acoustic, Eulerian, and particle elements support nonstandard continuum, flow, acoustic, granular, and mesh-free analysis workflows.
|
||||
|
||||
## How They Work
|
||||
|
||||
The continuum chapter includes acoustic and fluid continuum element libraries, while the special-purpose chapter includes Eulerian, fluid pipe, and fluid pipe connector elements. Eulerian elements in Abaqus/Explicit allow material to flow through a fixed mesh and can interact with Lagrangian elements through general contact.
|
||||
|
||||
The particle chapter separates discrete particle elements from continuum particle elements. `PD3D` is a one-node discrete particle element for DEM-style rigid spherical particles. `PC3D` is a one-node continuum particle element for SPH-style continuum particle analysis.
|
||||
|
||||
Fluid pipe and fluid pipe connector elements model incompressible pipe flow with pore-pressure-type degrees of freedom. Acoustic and acoustic interface elements support pressure-wave and fluid-structure interaction abstractions.
|
||||
|
||||
## Why It Matters
|
||||
|
||||
These element families are chosen when mesh motion, acoustic pressure, pipe flow, or particulate behavior is the modeling focus. They are not simple substitutes for standard Lagrangian solid elements; they change the kinematics, degrees of freedom, and output expectations.
|
||||
|
||||
## Connections
|
||||
|
||||
- [[Abaqus Eulerian and Particle Methods]] explains the analysis techniques that consume Eulerian, DEM, and SPH elements.
|
||||
- [[Abaqus Multiphysics Coupling and Co-simulation]] supplies the broader coupling context for acoustic and fluid-structure workflows.
|
||||
- [[Finite Element Heat Transfer and Field Problems]] covers the non-structural field-problem background.
|
||||
- [[Direct Time Integration Methods]] is important for Explicit particle and Eulerian workflows.
|
||||
|
||||
## Sources
|
||||
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]
|
||||
|
||||
@@ -0,0 +1,58 @@
|
||||
---
|
||||
type: concept
|
||||
title: "Abaqus Geomaterial and Concrete Plasticity"
|
||||
complexity: advanced
|
||||
domain: computational-mechanics
|
||||
created: 2026-06-01
|
||||
updated: 2026-06-01
|
||||
address: c-000097
|
||||
aliases:
|
||||
- Abaqus Drucker-Prager plasticity
|
||||
- Abaqus cap plasticity
|
||||
- Abaqus Mohr-Coulomb plasticity
|
||||
- Abaqus clay plasticity
|
||||
- Abaqus concrete plasticity
|
||||
tags:
|
||||
- concept
|
||||
- finite-element-method
|
||||
- abaqus
|
||||
- plasticity
|
||||
- geomaterials
|
||||
- concrete
|
||||
status: current
|
||||
related:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]]"
|
||||
- "[[Abaqus Metal Plasticity Models]]"
|
||||
- "[[Abaqus Porous Media and Pore Fluid Materials]]"
|
||||
- "[[Nonlinear Finite Element Analysis]]"
|
||||
- "[[Mixed Finite Element Formulations]]"
|
||||
sources:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]]"
|
||||
---
|
||||
|
||||
# Abaqus Geomaterial and Concrete Plasticity
|
||||
|
||||
## Definition
|
||||
|
||||
Abaqus geomaterial and concrete plasticity models describe pressure-dependent inelastic response, compaction, dilatancy, cracking, crushing, and stiffness degradation for soils, rocks, foams, jointed materials, and concrete-like media.
|
||||
|
||||
## How It Works
|
||||
|
||||
The source separates these models from ordinary metal plasticity because hydrostatic pressure can strongly influence yielding and volume change. Extended Drucker-Prager models represent pressure-dependent materials such as granular materials and polymers. Modified Drucker-Prager/Cap models add a cap yield surface to control volumetric compaction. Mohr-Coulomb and critical-state clay models support geotechnical applications with pressure and invariant-dependent yield behavior.
|
||||
|
||||
Crushable foam models target energy-absorbing foams and similar crushable media. Jointed material behavior represents continua containing dense sets of joint surfaces, such as sedimentary rock. Concrete is represented by multiple models: smeared cracking in Abaqus/Standard, brittle cracking in Abaqus/Explicit, and concrete damaged plasticity in both solvers.
|
||||
|
||||
## Why It Matters
|
||||
|
||||
These materials cannot usually be modeled by metal-style pressure-insensitive plasticity. They require pressure-dependent yield surfaces, inelastic volumetric strain, tensile cracking, crushing, or damage recovery effects that are tied to element choice, confinement, and loading path.
|
||||
|
||||
## Connections
|
||||
|
||||
- [[Mixed Finite Element Formulations]] are relevant when volumetric locking or pressure-like fields dominate the response.
|
||||
- [[Abaqus Porous Media and Pore Fluid Materials]] extends geomaterial modeling to pore-fluid flow and saturation effects.
|
||||
- [[Nonlinear Finite Element Analysis]] supplies the global iteration framework for pressure-dependent plasticity and concrete damage.
|
||||
|
||||
## Sources
|
||||
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]]
|
||||
|
||||
@@ -0,0 +1,57 @@
|
||||
---
|
||||
type: concept
|
||||
title: "Abaqus Hydrodynamic Equation of State Materials"
|
||||
complexity: advanced
|
||||
domain: computational-mechanics
|
||||
created: 2026-06-01
|
||||
updated: 2026-06-01
|
||||
address: c-000099
|
||||
aliases:
|
||||
- Abaqus EOS materials
|
||||
- Abaqus equation of state
|
||||
- Abaqus hydrodynamic materials
|
||||
- Abaqus JWL equation of state
|
||||
tags:
|
||||
- concept
|
||||
- finite-element-method
|
||||
- abaqus
|
||||
- equation-of-state
|
||||
- explicit-dynamics
|
||||
- materials
|
||||
status: current
|
||||
related:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]]"
|
||||
- "[[Abaqus Explicit Analysis Efficiency Techniques]]"
|
||||
- "[[Abaqus Metal Plasticity Models]]"
|
||||
- "[[Direct Time Integration Methods]]"
|
||||
- "[[Abaqus User-Defined Material Behavior]]"
|
||||
sources:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]]"
|
||||
---
|
||||
|
||||
# Abaqus Hydrodynamic Equation of State Materials
|
||||
|
||||
## Definition
|
||||
|
||||
Abaqus hydrodynamic equation of state materials define pressure as a function of density and internal energy for high-pressure, shock, explosive, gas, and fluid-like Abaqus/Explicit analyses.
|
||||
|
||||
## How It Works
|
||||
|
||||
The guide defines an equation of state as a volumetric constitutive relation where pressure is positive in compression and depends on density and specific internal energy. Abaqus/Explicit supports Mie-Gruneisen equations of state with a linear shock-velocity/particle-velocity Hugoniot form, tabulated equations of state linear in energy, P-alpha compaction for ductile porous materials, JWL high explosive equations of state, ignition-and-growth forms, ideal gas behavior, and user-defined EOS behavior through `VUEOS`.
|
||||
|
||||
EOS materials may have no shear strength or may be combined with isotropic elastic or viscous deviatoric behavior. They can also be combined with selected plasticity models and tensile failure for dynamic spall or pressure cutoff behavior. Unless a fully coupled temperature-displacement dynamic analysis is used, the EOS response assumes adiabatic conditions.
|
||||
|
||||
## Why It Matters
|
||||
|
||||
EOS models shift material modeling from stress-strain elasticity to pressure-density-energy response. They are essential for impact, shock, explosion, compaction, and fluid-like explicit simulations where volumetric response controls wave speed, pressure, and stable time increment.
|
||||
|
||||
## Connections
|
||||
|
||||
- [[Direct Time Integration Methods]] supplies the explicit dynamic time-stepping context.
|
||||
- [[Abaqus Explicit Analysis Efficiency Techniques]] is affected by EOS wave speeds and stable increments.
|
||||
- [[Abaqus User-Defined Material Behavior]] includes `VUEOS` when built-in EOS forms are insufficient.
|
||||
|
||||
## Sources
|
||||
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]]
|
||||
|
||||
@@ -0,0 +1,59 @@
|
||||
---
|
||||
type: concept
|
||||
title: "Abaqus Hyperelastic and Viscoelastic Materials"
|
||||
complexity: advanced
|
||||
domain: computational-mechanics
|
||||
created: 2026-06-01
|
||||
updated: 2026-06-01
|
||||
address: c-000095
|
||||
aliases:
|
||||
- Abaqus hyperelasticity
|
||||
- Abaqus viscoelasticity
|
||||
- Abaqus elastomer materials
|
||||
- Abaqus Mullins effect
|
||||
tags:
|
||||
- concept
|
||||
- finite-element-method
|
||||
- abaqus
|
||||
- hyperelasticity
|
||||
- viscoelasticity
|
||||
- materials
|
||||
status: current
|
||||
related:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]]"
|
||||
- "[[Abaqus Elastic Material Models]]"
|
||||
- "[[Hybrid Incompressible Elements]]"
|
||||
- "[[Nonlinear Finite Element Analysis]]"
|
||||
- "[[Abaqus Thermal Expansion and Damping Materials]]"
|
||||
sources:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]]"
|
||||
---
|
||||
|
||||
# Abaqus Hyperelastic and Viscoelastic Materials
|
||||
|
||||
## Definition
|
||||
|
||||
Abaqus hyperelastic and viscoelastic material models describe large-strain recoverable response and time- or frequency-dependent response, especially for rubberlike materials and elastomeric foams.
|
||||
|
||||
## How It Works
|
||||
|
||||
Hyperelastic models use strain energy potentials to describe finite-strain elastic response. The source lists rubberlike isotropic hyperelasticity, elastomeric foams, and anisotropic hyperelastic behavior. Rubberlike materials are often nearly incompressible, so Abaqus/Standard commonly requires hybrid continuum elements for highly confined nearly incompressible cases, while Abaqus/Explicit requires explicit compressibility because it cannot enforce exact incompressibility at each material point.
|
||||
|
||||
The guide also covers stress softening and dissipation in elastomers. Mullins-effect modeling reduces stiffness after prior loading; elastomeric foam energy dissipation and permanent set models capture hysteretic or residual effects.
|
||||
|
||||
Viscoelastic behavior appears in time-domain and frequency-domain forms. Time-domain models use relaxation behavior, while frequency-domain models describe storage and loss response. Nonlinear viscoelastic capabilities include hysteresis in elastomers and the parallel rheological framework.
|
||||
|
||||
## Why It Matters
|
||||
|
||||
Elastomer and foam models are strongly tied to nonlinear geometry, incompressibility, test-data calibration, and dissipation. A stable element and procedure choice is part of the material model, not a separate afterthought.
|
||||
|
||||
## Connections
|
||||
|
||||
- [[Hybrid Incompressible Elements]] are often required for nearly incompressible hyperelastic solids in Abaqus/Standard.
|
||||
- [[Nonlinear Finite Element Analysis]] supplies the finite-strain and contact-capable solution setting these models usually need.
|
||||
- [[Abaqus Thermal Expansion and Damping Materials]] connects thermal expansion and damping behavior that may be combined with elastomer models.
|
||||
|
||||
## Sources
|
||||
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]]
|
||||
|
||||
@@ -0,0 +1,59 @@
|
||||
---
|
||||
type: concept
|
||||
title: "Abaqus Inertial Rigid and Capacitance Elements"
|
||||
complexity: intermediate
|
||||
domain: computational-mechanics
|
||||
created: 2026-06-01
|
||||
updated: 2026-06-01
|
||||
address: c-000109
|
||||
aliases:
|
||||
- Abaqus point mass elements
|
||||
- Abaqus rotary inertia elements
|
||||
- Abaqus rigid elements
|
||||
- Abaqus heat capacitance elements
|
||||
tags:
|
||||
- concept
|
||||
- finite-element-method
|
||||
- abaqus
|
||||
- inertial-elements
|
||||
- rigid-elements
|
||||
status: current
|
||||
related:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]"
|
||||
- "[[Abaqus Element Selection and Formulation]]"
|
||||
- "[[Direct Time Integration Methods]]"
|
||||
- "[[Abaqus Spatial Model Definition]]"
|
||||
- "[[Finite Element Heat Transfer and Field Problems]]"
|
||||
sources:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]"
|
||||
---
|
||||
|
||||
# Abaqus Inertial Rigid and Capacitance Elements
|
||||
|
||||
## Definition
|
||||
|
||||
Abaqus inertial, rigid, and capacitance elements add concentrated mass, rotary inertia, rigid geometry, or point heat capacity without modeling a full deformable continuum.
|
||||
|
||||
## How They Work
|
||||
|
||||
Point mass and rotary inertia elements attach translational or rotational inertia to nodes. They are useful when the inertia of a component is important but its deformation is not being modeled explicitly.
|
||||
|
||||
Rigid elements define rigid links, facets, or axisymmetric rigid geometry. They can participate in constraints, contact, or load transfer while avoiding deformable-element stiffness.
|
||||
|
||||
Point capacitance elements add thermal storage to a node in heat-transfer workflows. They are the thermal analog of a concentrated capacity rather than a deformable structural element.
|
||||
|
||||
## Why It Matters
|
||||
|
||||
These elements are modeling shortcuts with physical consequences. They can make a model much cheaper and clearer, but they also concentrate inertia, stiffness, or heat capacity at specific nodes and must be tied to the surrounding model deliberately.
|
||||
|
||||
## Connections
|
||||
|
||||
- [[Direct Time Integration Methods]] is sensitive to concentrated mass and rotary inertia.
|
||||
- [[Abaqus Spatial Model Definition]] provides the node and element-set context for these discrete elements.
|
||||
- [[Finite Element Heat Transfer and Field Problems]] supplies the heat-capacitance use case.
|
||||
- [[Abaqus Element Selection and Formulation]] places these families in the broader element library.
|
||||
|
||||
## Sources
|
||||
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]
|
||||
|
||||
@@ -0,0 +1,57 @@
|
||||
---
|
||||
type: concept
|
||||
title: "Abaqus Initial and Boundary Conditions"
|
||||
complexity: intermediate
|
||||
domain: computational-mechanics
|
||||
created: 2026-06-01
|
||||
updated: 2026-06-01
|
||||
address: c-000118
|
||||
aliases:
|
||||
- Abaqus boundary conditions
|
||||
- Abaqus initial conditions
|
||||
- Abaqus CFD boundary conditions
|
||||
tags:
|
||||
- concept
|
||||
- finite-element-method
|
||||
- abaqus
|
||||
- boundary-conditions
|
||||
- initial-conditions
|
||||
status: current
|
||||
related:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]"
|
||||
- "[[Abaqus Prescribed Conditions and Amplitudes]]"
|
||||
- "[[Abaqus Spatial Model Definition]]"
|
||||
- "[[Abaqus General and Linear Perturbation Steps]]"
|
||||
- "[[Abaqus Multiphysics Coupling and Co-simulation]]"
|
||||
sources:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]"
|
||||
---
|
||||
|
||||
# Abaqus Initial and Boundary Conditions
|
||||
|
||||
## Definition
|
||||
|
||||
Abaqus initial and boundary conditions prescribe starting values or constrained solution variables for structural, thermal, acoustic, pore-pressure, electrical, and fluid analyses.
|
||||
|
||||
## How They Work
|
||||
|
||||
Initial conditions assign nonzero starting values before the step history begins. Boundary conditions prescribe solution variables such as displacement, rotation, temperature, electric potential, pore pressure, acoustic pressure, velocity, turbulence quantities, or other active degrees of freedom.
|
||||
|
||||
Boundary conditions can propagate between steps, be modified, or be removed. They can also be expressed in transformed local coordinate systems, so the same nodal data can represent local directions rather than global axes.
|
||||
|
||||
Abaqus/CFD has its own boundary-condition classes for inflow, outflow, wall, no-slip/no-penetration, slip wall, and related flow conditions. These conditions define a well-posed incompressible flow problem rather than structural constraints.
|
||||
|
||||
## Why It Matters
|
||||
|
||||
Boundary conditions close the mathematical model. Incorrect initial values or constraints can dominate reactions, contact behavior, convergence, and coupled-field results even when the mesh and material definitions are correct.
|
||||
|
||||
## Connections
|
||||
|
||||
- [[Abaqus Prescribed Conditions and Amplitudes]] describes the shared amplitude and propagation rules.
|
||||
- [[Abaqus Spatial Model Definition]] supplies the node, set, and coordinate-system references.
|
||||
- [[Abaqus Multiphysics Coupling and Co-simulation]] uses fields and boundary values transferred from prior analyses.
|
||||
|
||||
## Sources
|
||||
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]
|
||||
|
||||
@@ -4,7 +4,7 @@ title: "Abaqus Input File Syntax"
|
||||
complexity: intermediate
|
||||
domain: computational-mechanics
|
||||
created: 2026-05-29
|
||||
updated: 2026-05-29
|
||||
updated: 2026-06-01
|
||||
address: c-000072
|
||||
aliases:
|
||||
- ABAQUS input syntax
|
||||
@@ -18,12 +18,17 @@ tags:
|
||||
status: current
|
||||
related:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-I|Abaqus Analysis User's Guide Volume I]]"
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]"
|
||||
- "[[ABAQUS]]"
|
||||
- "[[Abaqus Spatial Model Definition]]"
|
||||
- "[[Abaqus Prescribed Conditions and Amplitudes]]"
|
||||
- "[[Abaqus Kinematic Constraints and MPCs]]"
|
||||
- "[[Abaqus Contact Interaction Definition]]"
|
||||
- "[[Abaqus Job Execution Workflow]]"
|
||||
- "[[Finite Element Program Implementation]]"
|
||||
sources:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-I|Abaqus Analysis User's Guide Volume I]]"
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]"
|
||||
---
|
||||
|
||||
# Abaqus Input File Syntax
|
||||
@@ -38,6 +43,8 @@ An Abaqus input file is an ASCII file arranged as option blocks. Keyword lines b
|
||||
|
||||
The guide separates input into model data and history data. Model data define the reusable analysis model: nodes, elements, materials, sections, sets, initial conditions, and assembly structure. History data define analysis steps: procedure type, loads, boundary conditions, interactions, controls, and output requests. `*STEP` and `*END STEP` delimit each step.
|
||||
|
||||
[[Abaqus-Analysis-User-s-Guide-Volume-V|Volume V]] expands the history-data side of this syntax: prescribed conditions, amplitude references, boundary conditions, loads, predefined fields, constraints, contact interactions, contact properties, and cavity radiation controls all become keyword-level definitions tied to steps, surfaces, sets, or named properties.
|
||||
|
||||
Sets and labels are the main referencing mechanism. Nodes and elements can be grouped into sets so later options can apply constraints, sections, loads, surfaces, or output requests without restating individual IDs. Labels are generally case-insensitive unless quoted, and include files can split a large model across multiple files.
|
||||
|
||||
## Why It Matters
|
||||
@@ -47,9 +54,11 @@ The input syntax is the user-visible API of a finite element code. It turns the
|
||||
## Connections
|
||||
|
||||
- [[Abaqus Spatial Model Definition]] supplies the node, element, set, and assembly content referenced by the syntax.
|
||||
- [[Abaqus Prescribed Conditions and Amplitudes]] and [[Abaqus Contact Interaction Definition]] show how history data drives loads, constraints, and interactions.
|
||||
- [[Abaqus Job Execution Workflow]] consumes the input file through the `abaqus` command and related checks.
|
||||
- [[Abaqus Output Database and Results Files]] is controlled by output requests placed in history data.
|
||||
|
||||
## Sources
|
||||
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-I|Abaqus Analysis User's Guide Volume I]]
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]
|
||||
|
||||
@@ -0,0 +1,58 @@
|
||||
---
|
||||
type: concept
|
||||
title: "Abaqus Kinematic Constraints and MPCs"
|
||||
complexity: advanced
|
||||
domain: computational-mechanics
|
||||
created: 2026-06-01
|
||||
updated: 2026-06-01
|
||||
address: c-000120
|
||||
aliases:
|
||||
- Abaqus MPCs
|
||||
- Abaqus multi-point constraints
|
||||
- Abaqus linear constraint equations
|
||||
tags:
|
||||
- concept
|
||||
- finite-element-method
|
||||
- abaqus
|
||||
- constraints
|
||||
- mpc
|
||||
status: current
|
||||
related:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]"
|
||||
- "[[Abaqus Surface-Based Constraints and Couplings]]"
|
||||
- "[[Abaqus Embedded Elements and Overconstraints]]"
|
||||
- "[[Mixed Finite Element Formulations]]"
|
||||
- "[[Abaqus User Subroutines and Utility Routines]]"
|
||||
sources:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]"
|
||||
---
|
||||
|
||||
# Abaqus Kinematic Constraints and MPCs
|
||||
|
||||
## Definition
|
||||
|
||||
Abaqus kinematic constraints and MPCs impose algebraic relationships among nodal degrees of freedom beyond ordinary element connectivity.
|
||||
|
||||
## How They Work
|
||||
|
||||
The constraints chapter covers linear constraint equations, general multi-point constraints, kinematic coupling constraints, surface-based constraints, embedded elements, element end release, and overconstraint checks.
|
||||
|
||||
Linear equations define explicit algebraic relationships between degrees of freedom. Built-in MPC types provide common rigid, pinned, beam-like, or tied kinematic relationships. User subroutine `MPC` can define custom constraints but can only use degrees of freedom that exist somewhere in the model.
|
||||
|
||||
Kinematic coupling constraints tie selected degrees of freedom on a coupled region to a reference node. This creates a compact way to impose rigid-body-like motion or collect reactions without building a rigid part.
|
||||
|
||||
## Why It Matters
|
||||
|
||||
Constraints change the algebraic structure of the global system. They can simplify modeling, but competing constraints, contact, boundary conditions, or unsupported degrees of freedom can create overconstraints or misleading reactions.
|
||||
|
||||
## Connections
|
||||
|
||||
- [[Abaqus Surface-Based Constraints and Couplings]] covers the surface-region branch of the constraint workflow.
|
||||
- [[Abaqus Embedded Elements and Overconstraints]] covers constraint conflicts and diagnostic checks.
|
||||
- [[Mixed Finite Element Formulations]] supplies the broader constraint-enforcement context.
|
||||
- [[Abaqus User Subroutines and Utility Routines]] covers the user-code path for custom MPCs.
|
||||
|
||||
## Sources
|
||||
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]
|
||||
|
||||
@@ -0,0 +1,59 @@
|
||||
---
|
||||
type: concept
|
||||
title: "Abaqus Loads and Predefined Fields"
|
||||
complexity: intermediate
|
||||
domain: computational-mechanics
|
||||
created: 2026-06-01
|
||||
updated: 2026-06-01
|
||||
address: c-000119
|
||||
aliases:
|
||||
- Abaqus loads
|
||||
- Abaqus predefined fields
|
||||
- Abaqus pretension loads
|
||||
tags:
|
||||
- concept
|
||||
- finite-element-method
|
||||
- abaqus
|
||||
- loads
|
||||
- predefined-fields
|
||||
status: current
|
||||
related:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]"
|
||||
- "[[Abaqus Prescribed Conditions and Amplitudes]]"
|
||||
- "[[Finite Element Load Vector Assembly]]"
|
||||
- "[[Abaqus Surface and Assembly Modeling]]"
|
||||
- "[[Abaqus Multiphysics Coupling and Co-simulation]]"
|
||||
- "[[Abaqus Connector Elements and Behaviors]]"
|
||||
sources:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]"
|
||||
---
|
||||
|
||||
# Abaqus Loads and Predefined Fields
|
||||
|
||||
## Definition
|
||||
|
||||
Abaqus loads and predefined fields are prescribed external actions and non-solution-dependent spatial fields applied to an analysis model.
|
||||
|
||||
## How They Work
|
||||
|
||||
The load library includes concentrated loads, distributed loads, thermal loads, electromagnetic loads, acoustic and shock loads, pore-fluid flow, substructure loads, added mass, base motion, current density, electric charge, film conditions, fluxes, pressure, and other procedure-dependent loading types.
|
||||
|
||||
Predefined fields supply spatially and temporally varying quantities that are not solved as primary unknowns in the current procedure. Temperature is the most common predefined field, especially for sequential thermal-stress workflows.
|
||||
|
||||
Prescribed assembly loads include pretension sections for bolts or other fasteners in Abaqus/Standard. Connector elements can also receive prescribed loads or motions to represent actuated mechanisms.
|
||||
|
||||
## Why It Matters
|
||||
|
||||
Loads and fields are the right-hand side and environment of the finite element problem. They must be compatible with the active procedure, degrees of freedom, element families, and intended time history.
|
||||
|
||||
## Connections
|
||||
|
||||
- [[Finite Element Load Vector Assembly]] gives the finite element interpretation of concentrated and distributed loading.
|
||||
- [[Abaqus Surface and Assembly Modeling]] supplies surfaces, assemblies, and pretension-related regions.
|
||||
- [[Abaqus Multiphysics Coupling and Co-simulation]] uses predefined fields for sequentially coupled analyses.
|
||||
- [[Abaqus Connector Elements and Behaviors]] covers connector loads and motions.
|
||||
|
||||
## Sources
|
||||
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]
|
||||
|
||||
@@ -0,0 +1,58 @@
|
||||
---
|
||||
type: concept
|
||||
title: "Abaqus Material Library and Data Definition"
|
||||
complexity: intermediate
|
||||
domain: computational-mechanics
|
||||
created: 2026-06-01
|
||||
updated: 2026-06-01
|
||||
address: c-000093
|
||||
aliases:
|
||||
- Abaqus material data definition
|
||||
- Abaqus material library
|
||||
- material behavior combinations
|
||||
tags:
|
||||
- concept
|
||||
- finite-element-method
|
||||
- abaqus
|
||||
- materials
|
||||
- constitutive-modeling
|
||||
status: current
|
||||
related:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]]"
|
||||
- "[[Abaqus Input File Syntax]]"
|
||||
- "[[Abaqus Spatial Model Definition]]"
|
||||
- "[[Abaqus Constitutive Integration]]"
|
||||
- "[[Abaqus User-Defined Material Behavior]]"
|
||||
sources:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]]"
|
||||
---
|
||||
|
||||
# Abaqus Material Library and Data Definition
|
||||
|
||||
## Definition
|
||||
|
||||
Abaqus material library and data definition is the keyword-level system for naming materials, combining compatible material behaviors, supplying property data, and attaching those materials to model regions through section definitions.
|
||||
|
||||
## How It Works
|
||||
|
||||
A material definition starts with a named `*MATERIAL` block and then contains one or more material behavior options. A simple linear static stress analysis may need only elasticity, while nonlinear, thermal, coupled-field, or damage analyses may combine elasticity, density, plasticity, damping, expansion, conductivity, damage, and other behavior blocks.
|
||||
|
||||
Material data can depend on temperature and independent field variables. In Abaqus/Standard some behavior can also depend on solution variables. For anisotropic behavior, the material may require a local coordinate system; for spatially varying behavior in homogeneous solid continuum elements, some properties can be supplied through distributions.
|
||||
|
||||
The source emphasizes data discipline: tabular material data must be ordered by increasing independent variable values, enough points must be supplied to represent strongly nonlinear behavior, and finite-strain material data should use true stress and logarithmic strain when required by the model.
|
||||
|
||||
## Why It Matters
|
||||
|
||||
The material library is where a finite element model becomes physically specific. The same mesh and procedure can represent a metal forming operation, elastomer seal, concrete structure, porous soil, acoustic medium, or electromagnetic material depending on the material blocks attached to the model.
|
||||
|
||||
## Connections
|
||||
|
||||
- [[Abaqus Input File Syntax]] supplies the keyword and data-line structure used by material definitions.
|
||||
- [[Abaqus Spatial Model Definition]] assigns materials to element regions through sections.
|
||||
- [[Abaqus Constitutive Integration]] is the integration-point process that consumes material definitions during an analysis.
|
||||
- [[Abaqus User-Defined Material Behavior]] extends the material library when built-in behavior is insufficient.
|
||||
|
||||
## Sources
|
||||
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]]
|
||||
|
||||
@@ -0,0 +1,58 @@
|
||||
---
|
||||
type: concept
|
||||
title: "Abaqus Metal Plasticity Models"
|
||||
complexity: advanced
|
||||
domain: computational-mechanics
|
||||
created: 2026-06-01
|
||||
updated: 2026-06-01
|
||||
address: c-000096
|
||||
aliases:
|
||||
- Abaqus plasticity
|
||||
- Abaqus metal plasticity
|
||||
- Abaqus Johnson-Cook plasticity
|
||||
- Abaqus cyclic hardening
|
||||
tags:
|
||||
- concept
|
||||
- finite-element-method
|
||||
- abaqus
|
||||
- plasticity
|
||||
- materials
|
||||
status: current
|
||||
related:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]]"
|
||||
- "[[Abaqus Material Library and Data Definition]]"
|
||||
- "[[Abaqus Constitutive Integration]]"
|
||||
- "[[Nonlinear Finite Element Analysis]]"
|
||||
- "[[Abaqus Progressive Damage and Failure]]"
|
||||
sources:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]]"
|
||||
---
|
||||
|
||||
# Abaqus Metal Plasticity Models
|
||||
|
||||
## Definition
|
||||
|
||||
Abaqus metal plasticity models describe irreversible deformation, hardening, rate effects, thermal history effects, and specialized metal behavior within the Abaqus material library.
|
||||
|
||||
## How It Works
|
||||
|
||||
The guide frames most plasticity models as incremental theories. A yield surface determines whether the response is elastic, a flow rule determines plastic strain increments, and hardening or evolution laws update the yield or flow definition as inelastic deformation accumulates.
|
||||
|
||||
For metals, the major built-in families include classical Mises and Hill plasticity, isotropic and kinematic hardening, cyclic hardening, rate-dependent yield, creep and swelling, annealing or melting, anisotropic yield and creep, Johnson-Cook plasticity for high-strain-rate deformation, dynamic failure models, porous metal plasticity, cast iron plasticity, two-layer viscoplasticity, the ORNL model, and deformation plasticity for fully plastic fracture-mechanics solutions.
|
||||
|
||||
The source highlights data interpretation details: plastic hardening data use plastic strain rather than total strain; finite-strain metal data should generally be true stress and logarithmic plastic strain; and initial equivalent plastic strain can be supplied when prior hardening must be represented.
|
||||
|
||||
## Why It Matters
|
||||
|
||||
Plasticity is the primary material nonlinearity in many structural and manufacturing analyses. The correct model depends on loading history, rate, temperature, pressure dependence, cyclic behavior, and whether damage or failure is part of the simulation goal.
|
||||
|
||||
## Connections
|
||||
|
||||
- [[Abaqus Constitutive Integration]] performs the integration-point return/evolution calculations implied by plasticity models.
|
||||
- [[Nonlinear Finite Element Analysis]] provides the global incremental framework for plastic deformation.
|
||||
- [[Abaqus Progressive Damage and Failure]] often extends plasticity models with stiffness degradation and element deletion.
|
||||
|
||||
## Sources
|
||||
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]]
|
||||
|
||||
@@ -4,7 +4,7 @@ title: "Abaqus Multiphysics Coupling and Co-simulation"
|
||||
complexity: advanced
|
||||
domain: computational-mechanics
|
||||
created: 2026-05-29
|
||||
updated: 2026-05-29
|
||||
updated: 2026-06-01
|
||||
address: c-000089
|
||||
aliases:
|
||||
- Abaqus co-simulation
|
||||
@@ -19,12 +19,24 @@ tags:
|
||||
status: current
|
||||
related:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-II|Abaqus Analysis User's Guide Volume II]]"
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]]"
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]"
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]"
|
||||
- "[[Finite Element Heat Transfer and Field Problems]]"
|
||||
- "[[Abaqus Output Database and Results Files]]"
|
||||
- "[[Abaqus Job Execution Workflow]]"
|
||||
- "[[Abaqus User Subroutines and Utility Routines]]"
|
||||
- "[[Abaqus Transport Acoustic and Electromagnetic Materials]]"
|
||||
- "[[Abaqus Porous Media and Pore Fluid Materials]]"
|
||||
- "[[Abaqus Fluid Acoustic Eulerian and Particle Elements]]"
|
||||
- "[[Abaqus Loads and Predefined Fields]]"
|
||||
- "[[Abaqus Contact Property Models]]"
|
||||
- "[[Abaqus Cavity Radiation Interactions]]"
|
||||
sources:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-II|Abaqus Analysis User's Guide Volume II]]"
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]]"
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]"
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]"
|
||||
---
|
||||
|
||||
# Abaqus Multiphysics Coupling and Co-simulation
|
||||
@@ -39,6 +51,12 @@ Sequential coupling uses results from one analysis as predefined fields or loads
|
||||
|
||||
Co-simulation performs run-time coupling between Abaqus and another Abaqus analysis or a third-party program. The coupled domains exchange data over a common interface in a synchronized way. Examples include fluid-structure interaction, conjugate heat transfer, electromagnetic-thermal coupling, electromagnetic-mechanical coupling, Standard/Explicit structural partitioning, and structural-logical coupling with system-level models.
|
||||
|
||||
[[Abaqus-Analysis-User-s-Guide-Volume-III|Volume III]] adds the material definitions that make many coupled procedures meaningful: conductivity and specific heat for thermal coupling, diffusivity and solubility for mass diffusion, piezoelectric and electromagnetic properties for electromechanical coupling, and permeability/sorption/swelling data for pore-fluid stress coupling.
|
||||
|
||||
[[Abaqus-Analysis-User-s-Guide-Volume-IV|Volume IV]] adds the element families that carry many coupled fields: thermally coupled solid and shell variants, pore-pressure elements, acoustic elements, fluid continuum elements, fluid pipe and fluid pipe connector elements, and Eulerian elements.
|
||||
|
||||
[[Abaqus-Analysis-User-s-Guide-Volume-V|Volume V]] adds the boundary and interaction side of coupling: predefined fields carry sequentially coupled results, contact properties can include thermal, electrical, and pore-fluid transfer, and cavity radiation defines radiative thermal interaction among surfaces.
|
||||
|
||||
## Why It Matters
|
||||
|
||||
Coupled physics can be too expensive, too specialized, or too weakly coupled to solve with one monolithic procedure. Sequential coupling and co-simulation let analysts choose the coupling strength and solver boundary deliberately.
|
||||
@@ -48,8 +66,15 @@ Coupled physics can be too expensive, too specialized, or too weakly coupled to
|
||||
- [[Finite Element Heat Transfer and Field Problems]] gives the broader field-problem and multiphysics context.
|
||||
- [[Abaqus Output Database and Results Files]] provides the stored field histories used in sequential coupling.
|
||||
- [[Abaqus User Subroutines and Utility Routines]] provides lower-level extension paths for custom staggered or external data exchange.
|
||||
- [[Abaqus Transport Acoustic and Electromagnetic Materials]] supplies material properties for field and electromagnetic coupling.
|
||||
- [[Abaqus Porous Media and Pore Fluid Materials]] supplies material properties for coupled pore-pressure and deformation workflows.
|
||||
- [[Abaqus Fluid Acoustic Eulerian and Particle Elements]] supplies the element-family side of acoustic, fluid, Eulerian, and pipe-flow workflows.
|
||||
- [[Abaqus Loads and Predefined Fields]] supplies the field-transfer side of sequential workflows.
|
||||
- [[Abaqus Contact Property Models]] and [[Abaqus Cavity Radiation Interactions]] supply surface-interaction coupling mechanisms.
|
||||
|
||||
## Sources
|
||||
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-II|Abaqus Analysis User's Guide Volume II]]
|
||||
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]]
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]
|
||||
|
||||
@@ -4,7 +4,7 @@ title: "Abaqus Nonlinear Solution Control"
|
||||
complexity: advanced
|
||||
domain: computational-mechanics
|
||||
created: 2026-05-29
|
||||
updated: 2026-05-29
|
||||
updated: 2026-06-01
|
||||
address: c-000081
|
||||
aliases:
|
||||
- Abaqus convergence controls
|
||||
@@ -19,12 +19,17 @@ tags:
|
||||
status: current
|
||||
related:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-II|Abaqus Analysis User's Guide Volume II]]"
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]"
|
||||
- "[[Nonlinear Finite Element Analysis]]"
|
||||
- "[[Abaqus Prescribed Conditions and Amplitudes]]"
|
||||
- "[[Abaqus Contact Formulations and Enforcement]]"
|
||||
- "[[Abaqus Contact Diagnostics and Modeling Difficulties]]"
|
||||
- "[[Static Equilibrium Equation Solvers]]"
|
||||
- "[[Direct Time Integration Methods]]"
|
||||
- "[[Abaqus Analysis Procedures]]"
|
||||
sources:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-II|Abaqus Analysis User's Guide Volume II]]"
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]"
|
||||
---
|
||||
|
||||
# Abaqus Nonlinear Solution Control
|
||||
@@ -41,6 +46,8 @@ If the iteration diverges or fails to meet tolerances, Abaqus may cut back the i
|
||||
|
||||
The guide also separates force residual convergence, correction-size checks, commonly used control parameters, automatic stabilization for unstable static problems, and transient time-integration accuracy checks.
|
||||
|
||||
[[Abaqus-Analysis-User-s-Guide-Volume-V|Volume V]] adds two common sources of nonlinear difficulty: abrupt prescribed-condition histories and contact enforcement. Amplitude choices, boundary-condition removal, contact penalty or direct enforcement, initial overclosures, redundant contact constraints, and poorly discretized surfaces can all drive cutbacks or nonconvergence.
|
||||
|
||||
## Why It Matters
|
||||
|
||||
Nonlinear failure is often not a material or element problem alone. It can reflect step size, stabilization, contact status, load amplitude, solver controls, or transient accuracy. This page is the operational counterpart to [[Nonlinear Finite Element Analysis]].
|
||||
@@ -49,9 +56,11 @@ Nonlinear failure is often not a material or element problem alone. It can refle
|
||||
|
||||
- [[Static Equilibrium Equation Solvers]] supplies the linear solves inside Newton iterations.
|
||||
- [[Direct Time Integration Methods]] supplies the transient integration context for dynamic steps.
|
||||
- [[Abaqus Prescribed Conditions and Amplitudes]] controls load and boundary-condition histories.
|
||||
- [[Abaqus Contact Formulations and Enforcement]] and [[Abaqus Contact Diagnostics and Modeling Difficulties]] cover contact-specific convergence drivers.
|
||||
- [[Abaqus Resource and Parallel Execution]] affects the cost of repeated tangent solves and cutbacks.
|
||||
|
||||
## Sources
|
||||
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-II|Abaqus Analysis User's Guide Volume II]]
|
||||
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]
|
||||
|
||||
@@ -0,0 +1,58 @@
|
||||
---
|
||||
type: concept
|
||||
title: "Abaqus Porous Media and Pore Fluid Materials"
|
||||
complexity: advanced
|
||||
domain: computational-mechanics
|
||||
created: 2026-06-01
|
||||
updated: 2026-06-01
|
||||
address: c-000102
|
||||
aliases:
|
||||
- Abaqus pore fluid materials
|
||||
- Abaqus permeability
|
||||
- Abaqus sorption
|
||||
- Abaqus moisture swelling
|
||||
- Abaqus porous media
|
||||
tags:
|
||||
- concept
|
||||
- finite-element-method
|
||||
- abaqus
|
||||
- porous-media
|
||||
- pore-fluid
|
||||
- materials
|
||||
status: current
|
||||
related:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]]"
|
||||
- "[[Abaqus Geomaterial and Concrete Plasticity]]"
|
||||
- "[[Abaqus Multiphysics Coupling and Co-simulation]]"
|
||||
- "[[Finite Element Heat Transfer and Field Problems]]"
|
||||
- "[[Mixed Finite Element Formulations]]"
|
||||
sources:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]]"
|
||||
---
|
||||
|
||||
# Abaqus Porous Media and Pore Fluid Materials
|
||||
|
||||
## Definition
|
||||
|
||||
Abaqus porous media and pore fluid material definitions describe flow, compressibility, saturation, sorption, and swelling behavior in fluid-filled porous materials.
|
||||
|
||||
## How It Works
|
||||
|
||||
The guide lists pore-fluid material properties for coupled pore fluid diffusion and stress analysis. Permeability defines the relation between flow rate and hydraulic or piezometric head gradients. In Abaqus/Standard it can be isotropic, orthotropic, anisotropic, velocity-dependent, and saturation-dependent; in Abaqus/CFD it can also use relations such as Carman-Kozeny and inertial drag.
|
||||
|
||||
Porous bulk moduli define the compressibility of solid grains and the permeating fluid. Sorption defines absorption and exsorption under partially saturated flow. Swelling gel and moisture swelling capture saturation-driven volumetric swelling behavior, including anisotropic swelling ratios and consistency requirements for initial saturation and pore pressure.
|
||||
|
||||
## Why It Matters
|
||||
|
||||
Porous media analysis couples mechanical deformation, pore pressure, saturation, and flow. The material data are not just constitutive constants; they control the coupled storage, transport, and deformation response of soils, rocks, gels, and other saturated or partially saturated media.
|
||||
|
||||
## Connections
|
||||
|
||||
- [[Abaqus Geomaterial and Concrete Plasticity]] supplies adjacent pressure-dependent solid skeleton models.
|
||||
- [[Mixed Finite Element Formulations]] is relevant because pore pressure acts as an additional field.
|
||||
- [[Abaqus Multiphysics Coupling and Co-simulation]] provides the broader coupled-analysis workflow.
|
||||
|
||||
## Sources
|
||||
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]]
|
||||
|
||||
@@ -0,0 +1,59 @@
|
||||
---
|
||||
type: concept
|
||||
title: "Abaqus Prescribed Conditions and Amplitudes"
|
||||
complexity: intermediate
|
||||
domain: computational-mechanics
|
||||
created: 2026-06-01
|
||||
updated: 2026-06-01
|
||||
address: c-000117
|
||||
aliases:
|
||||
- Abaqus prescribed conditions
|
||||
- Abaqus amplitude curves
|
||||
- Abaqus time-dependent loads
|
||||
tags:
|
||||
- concept
|
||||
- finite-element-method
|
||||
- abaqus
|
||||
- prescribed-conditions
|
||||
- amplitudes
|
||||
status: current
|
||||
related:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]"
|
||||
- "[[Abaqus Initial and Boundary Conditions]]"
|
||||
- "[[Abaqus Loads and Predefined Fields]]"
|
||||
- "[[Abaqus Input File Syntax]]"
|
||||
- "[[Abaqus General and Linear Perturbation Steps]]"
|
||||
- "[[Abaqus Nonlinear Solution Control]]"
|
||||
sources:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]"
|
||||
---
|
||||
|
||||
# Abaqus Prescribed Conditions and Amplitudes
|
||||
|
||||
## Definition
|
||||
|
||||
Abaqus prescribed conditions are externally imposed model quantities such as initial conditions, boundary conditions, loads, assembly loads, connector motions, and predefined fields. Amplitudes define their time or frequency variation.
|
||||
|
||||
## How It Works
|
||||
|
||||
A prescribed condition can be applied as model data or history data depending on the feature. Boundary conditions, loads, and predefined fields can refer to named amplitude curves. Without an explicit amplitude, Abaqus applies default ramp or step behavior depending on the product, procedure, and condition type.
|
||||
|
||||
Amplitude definitions can be tabular, equally spaced, periodic, modulated, smooth step, exponential, solution-dependent, user-defined, or imported from alternate files. They can use step time or total time and can be shared by many conditions.
|
||||
|
||||
In Abaqus/Standard, removing a displacement or rotation boundary condition in a stress/displacement analysis converts it to an applied conjugate flux that is then ramped or stepped to zero. This makes condition removal part of the load history rather than a purely symbolic edit.
|
||||
|
||||
## Why It Matters
|
||||
|
||||
The same nominal load or boundary value can produce very different nonlinear and dynamic results depending on its amplitude history. Prescribed conditions are therefore part of the analysis strategy, not just input decoration.
|
||||
|
||||
## Connections
|
||||
|
||||
- [[Abaqus Initial and Boundary Conditions]] covers the boundary-condition subset.
|
||||
- [[Abaqus Loads and Predefined Fields]] covers load and field definitions.
|
||||
- [[Abaqus General and Linear Perturbation Steps]] determines how step context changes condition interpretation.
|
||||
- [[Abaqus Nonlinear Solution Control]] is sensitive to abrupt prescribed-condition changes.
|
||||
|
||||
## Sources
|
||||
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]
|
||||
|
||||
@@ -0,0 +1,59 @@
|
||||
---
|
||||
type: concept
|
||||
title: "Abaqus Progressive Damage and Failure"
|
||||
complexity: advanced
|
||||
domain: computational-mechanics
|
||||
created: 2026-06-01
|
||||
updated: 2026-06-01
|
||||
address: c-000098
|
||||
aliases:
|
||||
- Abaqus damage initiation
|
||||
- Abaqus damage evolution
|
||||
- Abaqus element deletion
|
||||
- Abaqus composite damage
|
||||
tags:
|
||||
- concept
|
||||
- finite-element-method
|
||||
- abaqus
|
||||
- damage
|
||||
- failure
|
||||
- materials
|
||||
status: current
|
||||
related:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]]"
|
||||
- "[[Abaqus Metal Plasticity Models]]"
|
||||
- "[[Abaqus Fracture and Enriched Discontinuity Modeling]]"
|
||||
- "[[Abaqus Output Database and Results Files]]"
|
||||
- "[[Nonlinear Finite Element Analysis]]"
|
||||
sources:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]]"
|
||||
---
|
||||
|
||||
# Abaqus Progressive Damage and Failure
|
||||
|
||||
## Definition
|
||||
|
||||
Abaqus progressive damage and failure models degrade material stiffness after a damage initiation criterion is met and can remove failed elements from the calculation.
|
||||
|
||||
## How It Works
|
||||
|
||||
The guide organizes failure modeling into four parts: the undamaged material response, damage initiation, damage evolution, and optional element deletion. For ductile metals, Abaqus supports multiple initiation criteria, including ductile, shear, forming-limit, forming-limit-stress, MSFLD, and Marciniak-Kuczynski criteria. Damage evolution then progressively degrades stiffness.
|
||||
|
||||
For fiber-reinforced composites, the undamaged response is treated as linearly elastic, damage initiation is based on Hashin-type criteria, and damage evolution is based on energy dissipated during the damage process. For low-cycle fatigue in Abaqus/Standard, damage initiation and evolution are driven by accumulated inelastic hysteresis energy per stabilized cycle in the direct cyclic workflow.
|
||||
|
||||
The source highlights mesh dependency in softening materials. Abaqus alleviates this by using a characteristic length tied to element size and expressing damage evolution in a stress-displacement or energy-per-area form rather than a purely local stress-strain softening curve.
|
||||
|
||||
## Why It Matters
|
||||
|
||||
Failure simulation changes the finite element problem from smooth nonlinear constitutive response to localization, stiffness degradation, and topology change. Without attention to characteristic length, energy dissipation, and element deletion side effects, results can become mesh-dependent or numerically unstable.
|
||||
|
||||
## Connections
|
||||
|
||||
- [[Abaqus Metal Plasticity Models]] supplies many of the plasticity models combined with ductile damage.
|
||||
- [[Abaqus Fracture and Enriched Discontinuity Modeling]] is the adjacent crack-analysis and XFEM thread.
|
||||
- [[Abaqus Output Database and Results Files]] records status, scalar degradation, and damage-related output variables.
|
||||
|
||||
## Sources
|
||||
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]]
|
||||
|
||||
@@ -0,0 +1,58 @@
|
||||
---
|
||||
type: concept
|
||||
title: "Abaqus Special-Purpose Interaction Elements"
|
||||
complexity: advanced
|
||||
domain: computational-mechanics
|
||||
created: 2026-06-01
|
||||
updated: 2026-06-01
|
||||
address: c-000112
|
||||
aliases:
|
||||
- Abaqus special-purpose elements
|
||||
- Abaqus spring and dashpot elements
|
||||
- Abaqus interaction elements
|
||||
tags:
|
||||
- concept
|
||||
- finite-element-method
|
||||
- abaqus
|
||||
- special-purpose-elements
|
||||
- interaction-elements
|
||||
status: current
|
||||
related:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]"
|
||||
- "[[Abaqus Element Selection and Formulation]]"
|
||||
- "[[Abaqus Connector Elements and Behaviors]]"
|
||||
- "[[Abaqus Cohesive and Gasket Elements]]"
|
||||
- "[[Finite Element Contact Formulation]]"
|
||||
- "[[Abaqus Fracture and Enriched Discontinuity Modeling]]"
|
||||
sources:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]"
|
||||
---
|
||||
|
||||
# Abaqus Special-Purpose Interaction Elements
|
||||
|
||||
## Definition
|
||||
|
||||
Abaqus special-purpose interaction elements are discrete, interface, or auxiliary element families used when standard continuum or structural elements are not the right abstraction.
|
||||
|
||||
## How They Work
|
||||
|
||||
The Volume IV special-purpose chapter includes spring and dashpot elements, flexible joints, distributing coupling elements, surface elements, tube support elements, line spring elements, elastic-plastic joints, drag chain elements, pipe-soil elements, acoustic interface elements, Eulerian elements, fluid pipe elements, fluid pipe connector elements, and user-defined elements.
|
||||
|
||||
These elements typically encode a specific interaction, boundary abstraction, or reduced model. Some are mechanical point or line behaviors, some expose surfaces for loads or interactions, and some support specialized analyses such as fracture, pipe flow, or acoustic coupling.
|
||||
|
||||
## Why It Matters
|
||||
|
||||
Special-purpose elements prevent over-modeling. They let an analyst represent a local physical mechanism without building a detailed continuum mesh, but each one carries assumptions that should be checked against the intended behavior.
|
||||
|
||||
## Connections
|
||||
|
||||
- [[Abaqus Connector Elements and Behaviors]] is the main point-to-point behavior system.
|
||||
- [[Abaqus Cohesive and Gasket Elements]] covers interface layers with their own constitutive response.
|
||||
- [[Finite Element Contact Formulation]] is the surface-interaction alternative.
|
||||
- [[Abaqus Fracture and Enriched Discontinuity Modeling]] connects to line springs and crack-related abstractions.
|
||||
- [[Abaqus Fluid Acoustic Eulerian and Particle Elements]] covers the fluid, acoustic, Eulerian, and particle subset.
|
||||
|
||||
## Sources
|
||||
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]
|
||||
|
||||
@@ -0,0 +1,57 @@
|
||||
---
|
||||
type: concept
|
||||
title: "Abaqus Standard Contact Elements"
|
||||
complexity: advanced
|
||||
domain: computational-mechanics
|
||||
created: 2026-06-01
|
||||
updated: 2026-06-01
|
||||
address: c-000127
|
||||
aliases:
|
||||
- Abaqus/Standard contact elements
|
||||
- Abaqus gap contact elements
|
||||
- Abaqus slide line contact elements
|
||||
tags:
|
||||
- concept
|
||||
- finite-element-method
|
||||
- abaqus
|
||||
- contact-elements
|
||||
- abaqus-standard
|
||||
status: current
|
||||
related:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]"
|
||||
- "[[Abaqus Contact Interaction Definition]]"
|
||||
- "[[Abaqus Contact Property Models]]"
|
||||
- "[[Abaqus Special-Purpose Interaction Elements]]"
|
||||
- "[[Finite Element Contact Formulation]]"
|
||||
- "[[Abaqus Element Selection and Formulation]]"
|
||||
sources:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]"
|
||||
---
|
||||
|
||||
# Abaqus Standard Contact Elements
|
||||
|
||||
## Definition
|
||||
|
||||
Abaqus Standard contact elements are specialized Abaqus/Standard element families for contact cases that are not best handled by surface-based general contact or contact pairs.
|
||||
|
||||
## How They Work
|
||||
|
||||
The contact element library includes gap contact elements, tube-to-tube contact elements, slide line contact elements, and rigid surface contact elements. They require element creation, section or property assignment, and contact property definitions, similar in spirit to surface-based contact but expressed through element topology.
|
||||
|
||||
Gap elements model contact along specified directions between nodes or between a node and a surface. Tube-to-tube elements model contact between pipes or tubes. Slide line elements support certain axisymmetric or line-based finite-sliding contact workflows. Rigid surface contact elements support specialized rigid-deformable interactions.
|
||||
|
||||
## Why It Matters
|
||||
|
||||
Surface-based contact is usually preferred, but contact elements remain useful for specialized Abaqus/Standard models such as pipe-in-pipe contact, one-dimensional thermal contact, substructure-related contact, or asymmetric-axisymmetric workflows.
|
||||
|
||||
## Connections
|
||||
|
||||
- [[Abaqus Contact Interaction Definition]] explains when surface-based contact is preferred.
|
||||
- [[Abaqus Contact Property Models]] supplies the interface laws used by contact elements.
|
||||
- [[Abaqus Special-Purpose Interaction Elements]] places contact elements in the broader special-purpose element family.
|
||||
- [[Abaqus Element Selection and Formulation]] explains the element-library selection context.
|
||||
|
||||
## Sources
|
||||
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]
|
||||
|
||||
@@ -0,0 +1,58 @@
|
||||
---
|
||||
type: concept
|
||||
title: "Abaqus Structural Element Families"
|
||||
complexity: advanced
|
||||
domain: computational-mechanics
|
||||
created: 2026-06-01
|
||||
updated: 2026-06-01
|
||||
address: c-000107
|
||||
aliases:
|
||||
- Abaqus structural elements
|
||||
- Abaqus shell beam membrane truss elements
|
||||
- Abaqus shell elements
|
||||
tags:
|
||||
- concept
|
||||
- finite-element-method
|
||||
- abaqus
|
||||
- structural-elements
|
||||
- shell-elements
|
||||
status: current
|
||||
related:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]"
|
||||
- "[[Abaqus Element Selection and Formulation]]"
|
||||
- "[[Abaqus Beam and Shell Section Definitions]]"
|
||||
- "[[Beam and Frame Finite Elements]]"
|
||||
- "[[Bar and Truss Finite Elements]]"
|
||||
- "[[MITC4 Shell Element]]"
|
||||
- "[[Shell Locking Phenomenon]]"
|
||||
sources:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]"
|
||||
---
|
||||
|
||||
# Abaqus Structural Element Families
|
||||
|
||||
## Definition
|
||||
|
||||
Abaqus structural element families model lower-dimensional structural idealizations such as membranes, trusses, beams, frames, elbows, conventional shells, continuum shells, and axisymmetric shells.
|
||||
|
||||
## How They Work
|
||||
|
||||
Structural elements reduce dimensionality by introducing kinematic assumptions and section behavior. Trusses carry axial force. Beams and frames add bending, shear, torsion, rotations, and cross-section behavior. Membranes carry in-plane behavior without bending stiffness. Shells represent surface-like structures with membrane, bending, and transverse shear effects.
|
||||
|
||||
The shell library splits into conventional shell elements, continuum shell elements, and axisymmetric shell elements. Conventional shells use midsurface and thickness-section definitions, while continuum shells are three-dimensional in topology but shell-like through their section behavior. This makes element choice tightly coupled to section definition, thickness integration, and expected locking behavior.
|
||||
|
||||
## Why It Matters
|
||||
|
||||
Structural elements are efficient only when their assumptions match the physical structure. A beam or shell can be much cheaper than a solid model, but the section definition, orientation, transverse shear treatment, and connection to other element families become part of the model.
|
||||
|
||||
## Connections
|
||||
|
||||
- [[Abaqus Beam and Shell Section Definitions]] defines the section data that makes structural elements meaningful.
|
||||
- [[Beam and Frame Finite Elements]] and [[Bar and Truss Finite Elements]] provide the textbook structural-member background.
|
||||
- [[MITC4 Shell Element]] and [[Shell Locking Phenomenon]] explain why low-order shell interpolation needs careful strain treatment.
|
||||
- [[Abaqus Element Selection and Formulation]] describes how product, family, and formulation variants are encoded in element names.
|
||||
|
||||
## Sources
|
||||
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]
|
||||
|
||||
@@ -4,7 +4,7 @@ title: "Abaqus Surface and Assembly Modeling"
|
||||
complexity: advanced
|
||||
domain: computational-mechanics
|
||||
created: 2026-05-29
|
||||
updated: 2026-05-29
|
||||
updated: 2026-06-01
|
||||
address: c-000074
|
||||
aliases:
|
||||
- Abaqus surfaces
|
||||
@@ -19,12 +19,17 @@ tags:
|
||||
status: current
|
||||
related:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-I|Abaqus Analysis User's Guide Volume I]]"
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]"
|
||||
- "[[Abaqus Spatial Model Definition]]"
|
||||
- "[[Finite Element Contact Formulation]]"
|
||||
- "[[Abaqus Contact Interaction Definition]]"
|
||||
- "[[Abaqus Surface-Based Constraints and Couplings]]"
|
||||
- "[[Abaqus Cavity Radiation Interactions]]"
|
||||
- "[[Finite Element Load Vector Assembly]]"
|
||||
- "[[ABAQUS]]"
|
||||
sources:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-I|Abaqus Analysis User's Guide Volume I]]"
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]"
|
||||
---
|
||||
|
||||
# Abaqus Surface and Assembly Modeling
|
||||
@@ -37,6 +42,8 @@ Abaqus surface and assembly modeling is the workflow for defining named geometri
|
||||
|
||||
Surfaces are named regions used for contact and interactions, distributed loads, tie and coupling constraints, cavities, radiation, pretension sections, integrated output sections, and free body output. The guide distinguishes element-based, node-based, analytical rigid, and Eulerian material surfaces. Surface definitions have orientation and normal direction, but they are geometric or topological abstractions rather than volumetric elements.
|
||||
|
||||
[[Abaqus-Analysis-User-s-Guide-Volume-V|Volume V]] shows the consequences of those surface definitions: the same surface infrastructure drives general contact, contact pairs, surface-based tie and coupling constraints, shell-to-solid coupling, contact properties, diagnostic output, and cavity radiation facets.
|
||||
|
||||
Assemblies organize reusable parts and positioned instances. A part contains its own nodes, elements, sets, surfaces, and sections; an instance places that part into the assembly. The assembly then defines interactions, constraints, and analysis-level references between instances. Names are scoped within parts, instances, and the assembly.
|
||||
|
||||
Typical input-file boundaries are `*PART` / `*END PART`, `*INSTANCE` / `*END INSTANCE`, and `*ASSEMBLY` / `*END ASSEMBLY`.
|
||||
@@ -48,9 +55,13 @@ Surfaces and assemblies are the practical bridge between mesh topology and engin
|
||||
## Connections
|
||||
|
||||
- [[Finite Element Contact Formulation]] depends on stable surface definitions for interface constraints.
|
||||
- [[Abaqus Contact Interaction Definition]] defines the contact domains and pairs that consume surfaces.
|
||||
- [[Abaqus Surface-Based Constraints and Couplings]] uses surfaces to connect mismatched meshes and reference points.
|
||||
- [[Abaqus Cavity Radiation Interactions]] uses element-based surfaces as radiating facets.
|
||||
- [[Finite Element Load Vector Assembly]] uses surfaces when distributed surface tractions or pressures are converted into equivalent nodal terms.
|
||||
- [[Abaqus Spatial Model Definition]] supplies the nodes, elements, and sets that surfaces and assemblies reference.
|
||||
|
||||
## Sources
|
||||
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-I|Abaqus Analysis User's Guide Volume I]]
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]
|
||||
|
||||
@@ -0,0 +1,56 @@
|
||||
---
|
||||
type: concept
|
||||
title: "Abaqus Surface-Based Constraints and Couplings"
|
||||
complexity: advanced
|
||||
domain: computational-mechanics
|
||||
created: 2026-06-01
|
||||
updated: 2026-06-01
|
||||
address: c-000121
|
||||
aliases:
|
||||
- Abaqus tie constraints
|
||||
- Abaqus coupling constraints
|
||||
- Abaqus shell-to-solid coupling
|
||||
tags:
|
||||
- concept
|
||||
- finite-element-method
|
||||
- abaqus
|
||||
- constraints
|
||||
- surface-based-modeling
|
||||
status: current
|
||||
related:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]"
|
||||
- "[[Abaqus Kinematic Constraints and MPCs]]"
|
||||
- "[[Abaqus Surface and Assembly Modeling]]"
|
||||
- "[[Finite Element Contact Formulation]]"
|
||||
- "[[Abaqus Structural Element Families]]"
|
||||
sources:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]"
|
||||
---
|
||||
|
||||
# Abaqus Surface-Based Constraints and Couplings
|
||||
|
||||
## Definition
|
||||
|
||||
Abaqus surface-based constraints and couplings enforce kinematic relationships over named surfaces or regions rather than only between individual nodes.
|
||||
|
||||
## How They Work
|
||||
|
||||
Tie constraints join two separate surfaces so that relative motion is removed, often allowing dissimilar meshes to be connected. Coupling constraints relate a surface or node set to a reference point using either kinematic or distributing behavior. Shell-to-solid coupling transfers motion between shell edges and solid faces when structural and continuum regions meet.
|
||||
|
||||
Surface-to-surface tie constraints enforce compatibility in an averaged sense over a finite region. This can reduce numerical noise when meshes do not match, but it also makes surface definition, normal direction, and interaction order important.
|
||||
|
||||
## Why It Matters
|
||||
|
||||
Surface-based constraints are production tools for connecting independently meshed regions, idealized structures, and reference points. They prevent mesh compatibility from becoming a hard requirement, but they can compete with contact or boundary conditions if regions overlap.
|
||||
|
||||
## Connections
|
||||
|
||||
- [[Abaqus Surface and Assembly Modeling]] supplies the named surfaces used by these constraints.
|
||||
- [[Finite Element Contact Formulation]] is related because surface-to-surface ties and contact both act on interfaces.
|
||||
- [[Abaqus Structural Element Families]] matters for shell-to-solid coupling and structural-to-continuum transitions.
|
||||
- [[Abaqus Embedded Elements and Overconstraints]] covers conflicts among constraints and interactions.
|
||||
|
||||
## Sources
|
||||
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]
|
||||
|
||||
@@ -0,0 +1,58 @@
|
||||
---
|
||||
type: concept
|
||||
title: "Abaqus Thermal Expansion and Damping Materials"
|
||||
complexity: intermediate
|
||||
domain: computational-mechanics
|
||||
created: 2026-06-01
|
||||
updated: 2026-06-01
|
||||
address: c-000100
|
||||
aliases:
|
||||
- Abaqus material damping
|
||||
- Abaqus Rayleigh damping
|
||||
- Abaqus thermal expansion
|
||||
- Abaqus field expansion
|
||||
- Abaqus viscosity
|
||||
tags:
|
||||
- concept
|
||||
- finite-element-method
|
||||
- abaqus
|
||||
- damping
|
||||
- thermal-expansion
|
||||
- materials
|
||||
status: current
|
||||
related:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]]"
|
||||
- "[[Direct Time Integration Methods]]"
|
||||
- "[[Finite Element Thermal Stress Analysis]]"
|
||||
- "[[Abaqus Hyperelastic and Viscoelastic Materials]]"
|
||||
- "[[Abaqus Transport Acoustic and Electromagnetic Materials]]"
|
||||
sources:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]]"
|
||||
---
|
||||
|
||||
# Abaqus Thermal Expansion and Damping Materials
|
||||
|
||||
## Definition
|
||||
|
||||
Abaqus thermal expansion and damping material definitions add dissipative, thermally induced, field-induced, and viscous effects to otherwise mechanical material behavior.
|
||||
|
||||
## How It Works
|
||||
|
||||
Material damping includes Rayleigh damping for direct-integration, steady-state, subspace-based, and mode-based dynamic analyses. The mass-proportional factor damps low-frequency motion through a mass contribution, while the stiffness-proportional factor is interpreted as viscous material damping tied to elastic stiffness and strain rate.
|
||||
|
||||
Thermal expansion defines thermal strain from temperature change and reference temperature. Field expansion follows the same pattern but uses user-defined field variables rather than temperature. Both can be isotropic, orthotropic, or anisotropic, and both can be tied to initial temperature or field-variable values. The guide also covers viscosity definitions for Newtonian and non-Newtonian shear behavior.
|
||||
|
||||
## Why It Matters
|
||||
|
||||
These material definitions connect structural response to dynamic dissipation and environmental fields. They are often small compared to primary stiffness or plasticity, but they can dominate thermal stress, modal damping, explicit stability, and coupled-field accuracy.
|
||||
|
||||
## Connections
|
||||
|
||||
- [[Direct Time Integration Methods]] uses damping in transient and steady-state dynamic response.
|
||||
- [[Finite Element Thermal Stress Analysis]] uses thermal expansion to convert temperature changes into strain and stress.
|
||||
- [[Abaqus Hyperelastic and Viscoelastic Materials]] overlaps with dissipative response in elastomers and foams.
|
||||
|
||||
## Sources
|
||||
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]]
|
||||
|
||||
@@ -0,0 +1,61 @@
|
||||
---
|
||||
type: concept
|
||||
title: "Abaqus Transport Acoustic and Electromagnetic Materials"
|
||||
complexity: intermediate
|
||||
domain: computational-mechanics
|
||||
created: 2026-06-01
|
||||
updated: 2026-06-01
|
||||
address: c-000101
|
||||
aliases:
|
||||
- Abaqus thermal properties
|
||||
- Abaqus acoustic medium
|
||||
- Abaqus mass diffusion materials
|
||||
- Abaqus electromagnetic materials
|
||||
- Abaqus piezoelectric materials
|
||||
tags:
|
||||
- concept
|
||||
- finite-element-method
|
||||
- abaqus
|
||||
- transport
|
||||
- acoustics
|
||||
- electromagnetics
|
||||
- materials
|
||||
status: current
|
||||
related:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]]"
|
||||
- "[[Finite Element Heat Transfer and Field Problems]]"
|
||||
- "[[Abaqus Multiphysics Coupling and Co-simulation]]"
|
||||
- "[[Abaqus Thermal Expansion and Damping Materials]]"
|
||||
- "[[Abaqus Porous Media and Pore Fluid Materials]]"
|
||||
sources:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]]"
|
||||
---
|
||||
|
||||
# Abaqus Transport Acoustic and Electromagnetic Materials
|
||||
|
||||
## Definition
|
||||
|
||||
Abaqus transport, acoustic, and electromagnetic material properties define nonstructural field behavior and coupled-field material response.
|
||||
|
||||
## How It Works
|
||||
|
||||
The source groups thermal properties into conductivity, specific heat, and latent heat. Conductivity can be isotropic, orthotropic, or anisotropic, while specific heat and latent heat provide energy storage terms for heat-transfer and coupled thermal procedures.
|
||||
|
||||
Acoustic medium properties define compressibility, density-related wave behavior, volumetric drag, porous acoustic material models, and frequency-dependent acoustic response. Mass diffusion properties define diffusivity and solubility and can include temperature-driven or pressure-stress-driven diffusion.
|
||||
|
||||
Electromagnetic properties include electrical conductivity, piezoelectric behavior, dielectric properties, magnetic permeability, nonlinear magnetic behavior, and permanent magnetization. Piezoelectric behavior couples stress, strain, electrical potential gradient, and electric displacement, so it must be paired with appropriate elastic and dielectric definitions.
|
||||
|
||||
## Why It Matters
|
||||
|
||||
These properties show that the Abaqus material library is not only a solid-mechanics library. Material definitions also control thermal conduction, latent heat, acoustics, diffusion, piezoelectricity, electrical conduction, and magnetics, which makes them central to multiphysics finite element analysis.
|
||||
|
||||
## Connections
|
||||
|
||||
- [[Finite Element Heat Transfer and Field Problems]] is the broader finite element field-problem context.
|
||||
- [[Abaqus Multiphysics Coupling and Co-simulation]] uses these properties in sequential and coupled analyses.
|
||||
- [[Abaqus Thermal Expansion and Damping Materials]] connects mechanical strain and damping to field variables.
|
||||
|
||||
## Sources
|
||||
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]]
|
||||
|
||||
@@ -4,7 +4,7 @@ title: "Abaqus User Subroutines and Utility Routines"
|
||||
complexity: advanced
|
||||
domain: computational-mechanics
|
||||
created: 2026-05-29
|
||||
updated: 2026-05-29
|
||||
updated: 2026-06-01
|
||||
address: c-000091
|
||||
aliases:
|
||||
- Abaqus user subroutines
|
||||
@@ -19,12 +19,18 @@ tags:
|
||||
status: current
|
||||
related:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-II|Abaqus Analysis User's Guide Volume II]]"
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]]"
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]"
|
||||
- "[[Abaqus Job Execution Workflow]]"
|
||||
- "[[Abaqus Resource and Parallel Execution]]"
|
||||
- "[[Finite Element Program Implementation]]"
|
||||
- "[[Abaqus Multiphysics Coupling and Co-simulation]]"
|
||||
- "[[Abaqus User-Defined Material Behavior]]"
|
||||
- "[[Abaqus User-Defined Elements]]"
|
||||
sources:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-II|Abaqus Analysis User's Guide Volume II]]"
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]]"
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]"
|
||||
---
|
||||
|
||||
# Abaqus User Subroutines and Utility Routines
|
||||
@@ -41,6 +47,10 @@ Subroutines can call certain Abaqus utility routines, but user subroutines canno
|
||||
|
||||
The guide emphasizes implementation discipline: include the required Abaqus parameter files, follow Fortran/C calling conventions, avoid overwriting variables not designated for user definition, allocate large arrays dynamically, respect Abaqus file unit numbers, and test on small models before production use.
|
||||
|
||||
[[Abaqus-Analysis-User-s-Guide-Volume-III|Volume III]] adds the material-specific branch of this extension system. `UMAT`, `VUMAT`, and `UMATHT` define mechanical or thermal material behavior, allocate and update state variables, supply material tangents where required, and can participate in element deletion through state-variable flags.
|
||||
|
||||
[[Abaqus-Analysis-User-s-Guide-Volume-IV|Volume IV]] adds the element-specific branch. `UEL`, `UELMAT`, and `VUEL` allow custom element residuals, matrices, explicit element behavior, active degrees of freedom, state variables, loads, and output, but user elements have important contact and import limitations.
|
||||
|
||||
## Why It Matters
|
||||
|
||||
User subroutines are the point where a production finite element code becomes an extensible platform. They can encode material behavior, loads, fields, output, control logic, and external coupling, but they also introduce compiler, memory, thread-safety, restart, and debugging risks.
|
||||
@@ -50,8 +60,11 @@ User subroutines are the point where a production finite element code becomes an
|
||||
- [[Abaqus Job Execution Workflow]] supplies the command-line path for compiling and linking user code.
|
||||
- [[Abaqus Resource and Parallel Execution]] matters because user routines share memory and must behave correctly under parallel execution.
|
||||
- [[Finite Element Program Implementation]] is the broader code-architecture context for extension points.
|
||||
- [[Abaqus User-Defined Material Behavior]] focuses on the material subroutine subset of the extension workflow.
|
||||
- [[Abaqus User-Defined Elements]] focuses on the element subroutine subset of the extension workflow.
|
||||
|
||||
## Sources
|
||||
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-II|Abaqus Analysis User's Guide Volume II]]
|
||||
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]]
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]
|
||||
|
||||
@@ -0,0 +1,57 @@
|
||||
---
|
||||
type: concept
|
||||
title: "Abaqus User-Defined Elements"
|
||||
complexity: advanced
|
||||
domain: computational-mechanics
|
||||
created: 2026-06-01
|
||||
updated: 2026-06-01
|
||||
address: c-000114
|
||||
aliases:
|
||||
- Abaqus UEL
|
||||
- Abaqus UELMAT
|
||||
- Abaqus VUEL
|
||||
- user element
|
||||
tags:
|
||||
- concept
|
||||
- finite-element-method
|
||||
- abaqus
|
||||
- user-subroutines
|
||||
- element-formulation
|
||||
status: current
|
||||
related:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]"
|
||||
- "[[Abaqus User Subroutines and Utility Routines]]"
|
||||
- "[[Abaqus User-Defined Material Behavior]]"
|
||||
- "[[Finite Element Program Implementation]]"
|
||||
- "[[Abaqus Element Selection and Formulation]]"
|
||||
sources:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]"
|
||||
---
|
||||
|
||||
# Abaqus User-Defined Elements
|
||||
|
||||
## Definition
|
||||
|
||||
Abaqus user-defined elements let analysts implement custom element formulations through user subroutines rather than selecting a built-in element type.
|
||||
|
||||
## How They Work
|
||||
|
||||
In Abaqus/Standard, user elements can be implemented through `UEL`; `UELMAT` can access Abaqus material behavior from inside the element. In Abaqus/Explicit, `VUEL` supplies the explicit user-element contribution. The user defines the element type key, active nodal degrees of freedom, number of nodes, coordinate requirements, properties, state variables, loads, mass behavior, and element contributions.
|
||||
|
||||
User-defined element output must generally be stored as solution-dependent state variables. User elements can use node-based surfaces in limited contact roles, but they do not behave like built-in elements in all contact and import workflows. Standard-to-Explicit or Explicit-to-Standard import does not transfer user-element state automatically.
|
||||
|
||||
## Why It Matters
|
||||
|
||||
User-defined elements are the extension point for research formulations and specialized discretizations. They are powerful, but the analyst becomes responsible for element residuals, tangents or stable increments, state storage, loading, and numerical robustness.
|
||||
|
||||
## Connections
|
||||
|
||||
- [[Abaqus User Subroutines and Utility Routines]] supplies the general compiled-extension workflow.
|
||||
- [[Abaqus User-Defined Material Behavior]] is the material-level counterpart to user elements.
|
||||
- [[Finite Element Program Implementation]] provides the broader element-residual and assembly context.
|
||||
- [[Abaqus Element Selection and Formulation]] explains the built-in element decision space that user elements extend.
|
||||
|
||||
## Sources
|
||||
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]
|
||||
|
||||
@@ -0,0 +1,60 @@
|
||||
---
|
||||
type: concept
|
||||
title: "Abaqus User-Defined Material Behavior"
|
||||
complexity: advanced
|
||||
domain: computational-mechanics
|
||||
created: 2026-06-01
|
||||
updated: 2026-06-01
|
||||
address: c-000103
|
||||
aliases:
|
||||
- Abaqus UMAT
|
||||
- Abaqus VUMAT
|
||||
- Abaqus UMATHT
|
||||
- Abaqus user material
|
||||
- Abaqus user-defined material
|
||||
tags:
|
||||
- concept
|
||||
- finite-element-method
|
||||
- abaqus
|
||||
- user-subroutines
|
||||
- materials
|
||||
- implementation
|
||||
status: current
|
||||
related:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]]"
|
||||
- "[[Abaqus User Subroutines and Utility Routines]]"
|
||||
- "[[Abaqus Constitutive Integration]]"
|
||||
- "[[Abaqus Material Library and Data Definition]]"
|
||||
- "[[Finite Element Program Implementation]]"
|
||||
sources:
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]]"
|
||||
---
|
||||
|
||||
# Abaqus User-Defined Material Behavior
|
||||
|
||||
## Definition
|
||||
|
||||
Abaqus user-defined material behavior lets analysts implement mechanical or thermal constitutive laws through material subroutines when built-in material models are insufficient.
|
||||
|
||||
## How It Works
|
||||
|
||||
For mechanical behavior, Abaqus/Standard calls `UMAT` at material points during each iteration and requires updated stresses, solution-dependent state variables, and the material Jacobian matrix. The Jacobian quality strongly influences Newton convergence and computational efficiency. Abaqus/Explicit calls `VUMAT` on blocks of material points and passes information suited to explicit vectorized updates.
|
||||
|
||||
For thermal behavior, `UMATHT` defines constitutive thermal response. User materials can allocate state variables, output them through SDV identifiers, and use state variables to control element deletion. In Abaqus/Explicit, deleted material points remain in the subroutine block but receive zero stresses and strain increments after deletion.
|
||||
|
||||
The guide also describes practical combinations and limitations. User-defined mechanical materials can often be combined with density, thermal expansion, permeability, and heat-transfer properties, while stiffness-proportional damping must be handled through the user material in some cases.
|
||||
|
||||
## Why It Matters
|
||||
|
||||
User materials are the most direct bridge from finite element theory to production implementation. They offer maximum constitutive flexibility but move correctness burdens onto the analyst: stress update, state evolution, tangent consistency, deletion logic, heat generation, and compatibility with elements and procedures.
|
||||
|
||||
## Connections
|
||||
|
||||
- [[Abaqus User Subroutines and Utility Routines]] is the broader compiled-extension workflow.
|
||||
- [[Abaqus Constitutive Integration]] explains why stress updates and material tangents matter.
|
||||
- [[Finite Element Program Implementation]] provides the general FE code architecture context.
|
||||
|
||||
## Sources
|
||||
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]]
|
||||
|
||||
@@ -4,7 +4,7 @@ title: "Beam and Frame Finite Elements"
|
||||
complexity: intermediate
|
||||
domain: computational-mechanics
|
||||
created: 2026-05-29
|
||||
updated: 2026-05-29
|
||||
updated: 2026-06-01
|
||||
address: c-000065
|
||||
aliases:
|
||||
- beam finite element
|
||||
@@ -23,8 +23,11 @@ related:
|
||||
- "[[Finite Element Load Vector Assembly]]"
|
||||
- "[[Direct Time Integration Methods]]"
|
||||
- "[[Shell Locking Phenomenon]]"
|
||||
- "[[Abaqus Structural Element Families]]"
|
||||
- "[[Abaqus Beam and Shell Section Definitions]]"
|
||||
sources:
|
||||
- "[[A-First-Course-in-the-Finite-Element-Method|A First Course in the Finite Element Method]]"
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]"
|
||||
---
|
||||
|
||||
# Beam and Frame Finite Elements
|
||||
@@ -39,6 +42,8 @@ The Euler-Bernoulli beam element uses transverse displacement and rotation degre
|
||||
|
||||
For short or deep beams, transverse shear deformation can become significant, motivating Timoshenko beam theory. Frame elements then combine axial bar behavior with beam bending behavior and use coordinate transformation matrices so arbitrarily oriented members can be assembled into plane frames, grids, and spatial frames.
|
||||
|
||||
[[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]] connects this member theory to Abaqus beam, frame, pipe, and elbow element families. It also separates the element topology from the beam section definition, where cross-section geometry, orientation, material behavior, and integration rules are supplied.
|
||||
|
||||
## Why It Matters
|
||||
|
||||
Beam and frame elements sit between simple axial trusses and full continuum or shell models. They are efficient for bridges, buildings, machine frames, and grid structures when member-level idealization is appropriate.
|
||||
@@ -49,8 +54,10 @@ Beam and frame elements sit between simple axial trusses and full continuum or s
|
||||
- [[Finite Element Load Vector Assembly]] handles distributed loads and equivalent nodal forces on beams.
|
||||
- [[Direct Time Integration Methods]] uses beam mass matrices for vibration and transient structural analysis.
|
||||
- [[Shell Locking Phenomenon]] is conceptually related through transverse shear treatment, though shell locking is a different element pathology.
|
||||
- [[Abaqus Structural Element Families]] places beams and frames beside trusses, membranes, shells, and elbows in the Abaqus library.
|
||||
- [[Abaqus Beam and Shell Section Definitions]] covers the cross-section and orientation data that beam elements require.
|
||||
|
||||
## Sources
|
||||
|
||||
- [[A-First-Course-in-the-Finite-Element-Method|A First Course in the Finite Element Method]]
|
||||
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]
|
||||
|
||||
@@ -4,7 +4,7 @@ title: "Finite Element Contact Formulation"
|
||||
complexity: advanced
|
||||
domain: computational-mechanics
|
||||
created: 2026-05-29
|
||||
updated: 2026-05-29
|
||||
updated: 2026-06-01
|
||||
address: c-000060
|
||||
aliases:
|
||||
- contact formulation
|
||||
@@ -19,13 +19,25 @@ status: current
|
||||
related:
|
||||
- "[[Abaqus Theory Manual]]"
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-I|Abaqus Analysis User's Guide Volume I]]"
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]"
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]"
|
||||
- "[[Abaqus Surface and Assembly Modeling]]"
|
||||
- "[[Abaqus Analysis Procedures]]"
|
||||
- "[[Abaqus Contact Interaction Definition]]"
|
||||
- "[[Abaqus Contact Property Models]]"
|
||||
- "[[Abaqus Contact Formulations and Enforcement]]"
|
||||
- "[[Abaqus Contact Diagnostics and Modeling Difficulties]]"
|
||||
- "[[Abaqus Standard Contact Elements]]"
|
||||
- "[[Abaqus Connector Elements and Behaviors]]"
|
||||
- "[[Abaqus Cohesive and Gasket Elements]]"
|
||||
- "[[Abaqus Special-Purpose Interaction Elements]]"
|
||||
- "[[Nonlinear Finite Element Analysis]]"
|
||||
- "[[ABAQUS]]"
|
||||
sources:
|
||||
- "[[Abaqus Theory Manual]]"
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-I|Abaqus Analysis User's Guide Volume I]]"
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]"
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]"
|
||||
---
|
||||
|
||||
# Finite Element Contact Formulation
|
||||
@@ -42,6 +54,10 @@ Surface interactions can also carry frictional, thermal, electrical, acoustic, o
|
||||
|
||||
The user guide adds the model-definition layer: contact and interface behavior are applied to named surfaces, which can be element-based, node-based, analytical rigid, or Eulerian material surfaces. This makes surface definition and orientation part of the contact model, not just preprocessing detail.
|
||||
|
||||
[[Abaqus-Analysis-User-s-Guide-Volume-IV|Volume IV]] adds element alternatives to pure surface contact. Connector elements can idealize point-to-point joint behavior, cohesive and gasket elements can give an interface its own constitutive thickness or traction-separation law, and special-purpose surface or acoustic interface elements can expose targeted interaction behavior.
|
||||
|
||||
[[Abaqus-Analysis-User-s-Guide-Volume-V|Volume V]] expands contact into a complete modeling workflow: define general contact or contact pairs, assign surface and contact properties, select formulation and enforcement methods, inspect diagnostics, resolve modeling difficulties, and use Abaqus/Standard contact elements only for specialized cases.
|
||||
|
||||
## Why It Matters
|
||||
|
||||
Contact is one of the common reasons a finite element problem becomes nonlinear. It can dominate convergence, mesh sensitivity, and physical response, especially in shell-to-solid interaction, impact, forming, bolted assemblies, and problems with changing boundary conditions.
|
||||
@@ -52,8 +68,13 @@ Contact is one of the common reasons a finite element problem becomes nonlinear.
|
||||
- [[Abaqus Analysis Procedures]] determines whether the contact is solved by implicit, explicit, dynamic, or specialized workflows.
|
||||
- [[Abaqus Element Library]] supplies the surfaces and element types that participate in contact.
|
||||
- [[Abaqus Surface and Assembly Modeling]] describes how named surfaces are constructed before they are used by contact.
|
||||
- [[Abaqus Contact Interaction Definition]], [[Abaqus Contact Property Models]], and [[Abaqus Contact Formulations and Enforcement]] split the Abaqus contact workflow into definition, behavior, and numerical enforcement.
|
||||
- [[Abaqus Contact Diagnostics and Modeling Difficulties]] covers initial overclosures, surface quality, redundant constraints, and other contact failure modes.
|
||||
- [[Abaqus Connector Elements and Behaviors]] and [[Abaqus Cohesive and Gasket Elements]] cover element-based interaction alternatives.
|
||||
|
||||
## Sources
|
||||
|
||||
- [[Abaqus Theory Manual]]
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-I|Abaqus Analysis User's Guide Volume I]]
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]
|
||||
|
||||
@@ -7,7 +7,7 @@ aliases:
|
||||
- finite element field problems
|
||||
- finite element heat transfer
|
||||
created: 2026-05-28
|
||||
updated: 2026-05-29
|
||||
updated: 2026-06-01
|
||||
address: c-000012
|
||||
tags:
|
||||
- concept
|
||||
@@ -21,10 +21,17 @@ related:
|
||||
- "[[Finite Element Thermal Stress Analysis]]"
|
||||
- "[[Finite Element Load Vector Assembly]]"
|
||||
- "[[Abaqus Multiphysics Coupling and Co-simulation]]"
|
||||
- "[[Abaqus Transport Acoustic and Electromagnetic Materials]]"
|
||||
- "[[Abaqus Porous Media and Pore Fluid Materials]]"
|
||||
- "[[Abaqus Loads and Predefined Fields]]"
|
||||
- "[[Abaqus Contact Property Models]]"
|
||||
- "[[Abaqus Cavity Radiation Interactions]]"
|
||||
sources:
|
||||
- "[[Finite Element Procedures]]"
|
||||
- "[[A-First-Course-in-the-Finite-Element-Method|A First Course in the Finite Element Method]]"
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-II|Abaqus Analysis User's Guide Volume II]]"
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]]"
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]"
|
||||
---
|
||||
|
||||
# Finite Element Heat Transfer and Field Problems
|
||||
@@ -41,6 +48,10 @@ The governing field equation and boundary conditions are written in a weak or we
|
||||
|
||||
[[Abaqus-Analysis-User-s-Guide-Volume-II|Abaqus Analysis User's Guide Volume II]] adds production procedure coverage for heat transfer, coupled thermal-stress, adiabatic analysis, incompressible CFD, electromagnetic procedures, pore fluid diffusion and stress, mass diffusion, acoustic and shock analysis, Aqua loading, sequential coupling, and co-simulation.
|
||||
|
||||
[[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]] adds the material-property side of those procedures: conductivity, specific heat, latent heat, acoustic medium behavior, diffusivity, solubility, electrical conductivity, piezoelectricity, magnetic permeability, permeability, sorption, and porous bulk moduli.
|
||||
|
||||
[[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]] adds the boundary and interaction side: thermal loads, predefined temperature fields, thermal contact properties, pore-fluid contact properties, and cavity radiation interactions.
|
||||
|
||||
## Why It Matters
|
||||
|
||||
The chapter shows that finite element procedures are not limited to solid mechanics. Similar discretization and assembly patterns can solve different physical laws when the governing equations and boundary terms are formulated correctly.
|
||||
@@ -52,9 +63,15 @@ The chapter shows that finite element procedures are not limited to solid mechan
|
||||
- [[Mixed Finite Element Formulations]] is relevant for incompressible flow and pressure-like fields.
|
||||
- [[Finite Element Thermal Stress Analysis]] uses temperature fields to create thermal strain and stress contributions.
|
||||
- [[Abaqus Multiphysics Coupling and Co-simulation]] captures the sequential and run-time coupling workflows for field and structural domains.
|
||||
- [[Abaqus Transport Acoustic and Electromagnetic Materials]] supplies the field-specific material definitions used by many nonstructural procedures.
|
||||
- [[Abaqus Porous Media and Pore Fluid Materials]] supplies material data for coupled pore-fluid and stress problems.
|
||||
- [[Abaqus Loads and Predefined Fields]] covers thermal, acoustic, electromagnetic, and pore-fluid prescribed conditions.
|
||||
- [[Abaqus Cavity Radiation Interactions]] covers enclosure radiation as a heat-transfer surface interaction.
|
||||
|
||||
## Sources
|
||||
|
||||
- [[Finite Element Procedures]]
|
||||
- [[A-First-Course-in-the-Finite-Element-Method|A First Course in the Finite Element Method]]
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-II|Abaqus Analysis User's Guide Volume II]]
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]]
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]
|
||||
|
||||
@@ -4,7 +4,7 @@ title: "Finite Element Load Vector Assembly"
|
||||
complexity: intermediate
|
||||
domain: computational-mechanics
|
||||
created: 2026-05-29
|
||||
updated: 2026-05-29
|
||||
updated: 2026-06-01
|
||||
address: c-000068
|
||||
aliases:
|
||||
- equivalent nodal forces
|
||||
@@ -23,9 +23,12 @@ related:
|
||||
- "[[Plane Stress and Plane Strain Elements]]"
|
||||
- "[[Finite Element Thermal Stress Analysis]]"
|
||||
- "[[Abaqus Surface and Assembly Modeling]]"
|
||||
- "[[Abaqus Loads and Predefined Fields]]"
|
||||
- "[[Abaqus Prescribed Conditions and Amplitudes]]"
|
||||
sources:
|
||||
- "[[A-First-Course-in-the-Finite-Element-Method|A First Course in the Finite Element Method]]"
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-I|Abaqus Analysis User's Guide Volume I]]"
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]"
|
||||
---
|
||||
|
||||
# Finite Element Load Vector Assembly
|
||||
@@ -42,6 +45,8 @@ The source introduces this through distributed beam loading and later through bo
|
||||
|
||||
The Abaqus user guide shows the production modeling counterpart: named surfaces are used to apply pressure, traction, radiation, pretension, coupling, and other surface-based model features before the solver converts them into finite element contributions.
|
||||
|
||||
[[Abaqus-Analysis-User-s-Guide-Volume-V|Volume V]] broadens this to the full prescribed-condition layer: concentrated and distributed loads, thermal loads, electromagnetic loads, acoustic and shock loads, pore-fluid flow, pretension, connector loads and motions, and predefined fields all enter the model through procedure-compatible definitions and optional amplitudes.
|
||||
|
||||
## Why It Matters
|
||||
|
||||
Stiffness assembly alone does not define a finite element problem. Incorrectly transformed or assembled loads can produce wrong reactions, stress fields, and convergence behavior even when the element stiffness matrix is correct.
|
||||
@@ -53,8 +58,11 @@ Stiffness assembly alone does not define a finite element problem. Incorrectly t
|
||||
- [[Plane Stress and Plane Strain Elements]] require body and surface force vectors.
|
||||
- [[Finite Element Thermal Stress Analysis]] treats thermal strain as an equivalent initial force contribution.
|
||||
- [[Abaqus Surface and Assembly Modeling]] supplies the named surfaces used by production input files for many distributed loads.
|
||||
- [[Abaqus Loads and Predefined Fields]] catalogs the Abaqus load and field workflows.
|
||||
- [[Abaqus Prescribed Conditions and Amplitudes]] controls how loads vary through step or total time.
|
||||
|
||||
## Sources
|
||||
|
||||
- [[A-First-Course-in-the-Finite-Element-Method|A First Course in the Finite Element Method]]
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-I|Abaqus Analysis User's Guide Volume I]]
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]
|
||||
|
||||
@@ -4,7 +4,7 @@ title: "Finite Element Thermal Stress Analysis"
|
||||
complexity: intermediate
|
||||
domain: computational-mechanics
|
||||
created: 2026-05-29
|
||||
updated: 2026-05-29
|
||||
updated: 2026-06-01
|
||||
address: c-000070
|
||||
aliases:
|
||||
- thermal stress finite element analysis
|
||||
@@ -22,8 +22,10 @@ related:
|
||||
- "[[Plane Stress and Plane Strain Elements]]"
|
||||
- "[[Axisymmetric Finite Elements]]"
|
||||
- "[[Displacement-Based Finite Element Formulation]]"
|
||||
- "[[Abaqus Thermal Expansion and Damping Materials]]"
|
||||
sources:
|
||||
- "[[A-First-Course-in-the-Finite-Element-Method|A First Course in the Finite Element Method]]"
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]]"
|
||||
---
|
||||
|
||||
# Finite Element Thermal Stress Analysis
|
||||
@@ -38,6 +40,8 @@ The source treats thermal strain as an initial strain contribution. For a unifor
|
||||
|
||||
The same idea is applied to one-dimensional bars, plane stress and plane strain elements, and axisymmetric triangular elements. If the structure is free to expand, thermal strain may produce displacement without stress. If constraints or material incompatibility prevent free expansion, thermal stresses appear.
|
||||
|
||||
[[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]] adds production material definitions for this mechanism: thermal expansion coefficients, reference temperatures, temperature/field dependencies, isotropic/orthotropic/anisotropic expansion, and user-defined expansion increments through `UEXPAN`.
|
||||
|
||||
## Why It Matters
|
||||
|
||||
Thermal loading is not just another external force. It changes the strain state inside the element and can create stress only through constraint, incompatibility, or temperature gradients. Treating it as an equivalent nodal contribution keeps the global equation format compatible with the displacement formulation.
|
||||
@@ -47,8 +51,9 @@ Thermal loading is not just another external force. It changes the strain state
|
||||
- [[Finite Element Heat Transfer and Field Problems]] can supply the temperature distribution.
|
||||
- [[Finite Element Load Vector Assembly]] explains the equivalent nodal force interpretation.
|
||||
- [[Plane Stress and Plane Strain Elements]] and [[Axisymmetric Finite Elements]] provide common structural discretizations for thermal stress.
|
||||
- [[Abaqus Thermal Expansion and Damping Materials]] supplies Abaqus-specific thermal expansion and field expansion material definitions.
|
||||
|
||||
## Sources
|
||||
|
||||
- [[A-First-Course-in-the-Finite-Element-Method|A First Course in the Finite Element Method]]
|
||||
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]]
|
||||
|
||||
@@ -4,7 +4,7 @@ title: "Hybrid Incompressible Elements"
|
||||
complexity: advanced
|
||||
domain: computational-mechanics
|
||||
created: 2026-05-29
|
||||
updated: 2026-05-29
|
||||
updated: 2026-06-01
|
||||
address: c-000058
|
||||
aliases:
|
||||
- hybrid elements
|
||||
@@ -18,12 +18,18 @@ tags:
|
||||
status: current
|
||||
related:
|
||||
- "[[Abaqus Theory Manual]]"
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]"
|
||||
- "[[Abaqus Element Library]]"
|
||||
- "[[Abaqus Element Selection and Formulation]]"
|
||||
- "[[Abaqus Continuum Element Families]]"
|
||||
- "[[Mixed Finite Element Formulations]]"
|
||||
- "[[Reduced Integration and Hourglass Control]]"
|
||||
- "[[Isoparametric Finite Elements]]"
|
||||
- "[[Abaqus Hyperelastic and Viscoelastic Materials]]"
|
||||
sources:
|
||||
- "[[Abaqus Theory Manual]]"
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]]"
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]"
|
||||
---
|
||||
|
||||
# Hybrid Incompressible Elements
|
||||
@@ -36,6 +42,10 @@ Hybrid incompressible elements are mixed finite element formulations that introd
|
||||
|
||||
Displacement-only solid elements can become too stiff when the material response strongly constrains volume change. Abaqus addresses partly incompressible behavior through selective reduced integration of the volumetric strain contribution, and fully incompressible behavior through hybrid formulations where hydrostatic pressure acts as an additional unknown or Lagrange multiplier.
|
||||
|
||||
[[Abaqus-Analysis-User-s-Guide-Volume-III|Volume III]] makes this practical for material selection. Nearly incompressible hyperelastic solids, especially confined rubberlike materials, often require hybrid continuum elements in Abaqus/Standard; Abaqus/Explicit cannot enforce exact incompressibility at each material point and therefore requires a compressible approximation.
|
||||
|
||||
[[Abaqus-Analysis-User-s-Guide-Volume-IV|Volume IV]] makes the element-library side explicit: hybrid Abaqus elements are commonly marked with `H`, as in `C3D8H` or `B31H`, and are selected within continuum, beam, and truss families when incompressible or inextensible behavior would otherwise lock.
|
||||
|
||||
This separates deviatoric deformation from the incompressibility constraint. The element can represent shear deformation while enforcing the pressure or volume constraint through a mixed field rather than forcing the displacement interpolation to carry both roles.
|
||||
|
||||
## Why It Matters
|
||||
@@ -45,10 +55,14 @@ Rubbers, elastomers, plastic flow with small elastic compressibility, and some l
|
||||
## Connections
|
||||
|
||||
- [[Mixed Finite Element Formulations]] gives the general multi-field stability setting.
|
||||
- [[Abaqus Element Selection and Formulation]] explains how the `H` suffix appears in concrete Abaqus element names.
|
||||
- [[Abaqus Continuum Element Families]] shows the solid-element families where hybrid pressure treatment is common.
|
||||
- [[Reduced Integration and Hourglass Control]] is related but not equivalent; reduced quadrature may relieve stiffness, while hybrid elements explicitly add pressure variables.
|
||||
- [[Abaqus Constitutive Integration]] provides the integration-point material response that supplies deviatoric stress and consistent tangent terms.
|
||||
- [[Abaqus Hyperelastic and Viscoelastic Materials]] is a common material class where hybrid or carefully compressible formulations matter.
|
||||
|
||||
## Sources
|
||||
|
||||
- [[Abaqus Theory Manual]]
|
||||
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]]
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]
|
||||
|
||||
@@ -7,7 +7,7 @@ aliases:
|
||||
- isoparametric elements
|
||||
- isoparametric formulation
|
||||
created: 2026-05-28
|
||||
updated: 2026-05-29
|
||||
updated: 2026-06-01
|
||||
address: c-000009
|
||||
tags:
|
||||
- concept
|
||||
@@ -24,6 +24,8 @@ related:
|
||||
- "[[Continuum Mechanics Based Four-Node Shell Element]]"
|
||||
- "[[Assumed Transverse Shear Strain Interpolation]]"
|
||||
- "[[Abaqus Element Library]]"
|
||||
- "[[Abaqus Continuum Element Families]]"
|
||||
- "[[Abaqus Element Selection and Formulation]]"
|
||||
- "[[Reduced Integration and Hourglass Control]]"
|
||||
- "[[Hybrid Incompressible Elements]]"
|
||||
- "[[Plane Stress and Plane Strain Elements]]"
|
||||
@@ -33,6 +35,7 @@ sources:
|
||||
- "[[A Continuum Mechanics Based Four-Node Shell]]"
|
||||
- "[[Solid Element Notes]]"
|
||||
- "[[Abaqus Theory Manual]]"
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]"
|
||||
- "[[A-First-Course-in-the-Finite-Element-Method|A First Course in the Finite Element Method]]"
|
||||
---
|
||||
|
||||
@@ -56,6 +59,8 @@ The four-node shell paper is an example of this bridge: a general quadrilateral
|
||||
|
||||
[[Abaqus Element Library]] shows the same framework at software-library scale: isoparametric interpolation, numerical integration points, full or reduced quadrature, multi-field interpolation, and hybrid pressure variables become selectable element families.
|
||||
|
||||
[[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]] turns those ideas into named continuum elements: bricks, wedges, tetrahedra, plane elements, axisymmetric elements, fluid continuum elements, and coupled-field variants whose suffixes indicate reduced integration, hybrid pressure treatment, incompatible modes, temperature, pore pressure, or piezoelectric fields.
|
||||
|
||||
[[A-First-Course-in-the-Finite-Element-Method|A First Course in the Finite Element Method]] adds the teaching path: it develops isoparametric bar, rectangular plane stress, general plane, higher-order, and three-dimensional stress elements before connecting them to Gaussian and Newton-Cotes quadrature.
|
||||
|
||||
## Failure Modes
|
||||
@@ -71,4 +76,5 @@ The four-node shell paper is an example of this bridge: a general quadrilateral
|
||||
- [[A Continuum Mechanics Based Four-Node Shell]]
|
||||
- [[Solid Element Notes]]
|
||||
- [[Abaqus Theory Manual]]
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]
|
||||
- [[A-First-Course-in-the-Finite-Element-Method|A First Course in the Finite Element Method]]
|
||||
|
||||
@@ -9,7 +9,7 @@ aliases:
|
||||
- isoparametric solid elements
|
||||
- 3D solid elements
|
||||
created: 2026-05-28
|
||||
updated: 2026-05-29
|
||||
updated: 2026-06-01
|
||||
address: c-000049
|
||||
tags:
|
||||
- concept
|
||||
@@ -25,9 +25,12 @@ related:
|
||||
- "[[Solid Element Strain-Displacement Matrix]]"
|
||||
- "[[Solid Element Stiffness Integration]]"
|
||||
- "[[A-First-Course-in-the-Finite-Element-Method|A First Course in the Finite Element Method]]"
|
||||
- "[[Abaqus Continuum Element Families]]"
|
||||
- "[[Abaqus Element Selection and Formulation]]"
|
||||
sources:
|
||||
- "[[Solid Element Notes]]"
|
||||
- "[[A-First-Course-in-the-Finite-Element-Method|A First Course in the Finite Element Method]]"
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]"
|
||||
---
|
||||
|
||||
# Isoparametric Linear Solid Elements
|
||||
@@ -51,6 +54,8 @@ The covered topologies are 4-node tetrahedron, 5-node pyramid, 6-node wedge, and
|
||||
|
||||
[[A-First-Course-in-the-Finite-Element-Method|A First Course in the Finite Element Method]] adds the introductory three-dimensional stress path through tetrahedral solid elements and isoparametric solid formulation after the plane and axisymmetric element chapters.
|
||||
|
||||
[[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]] maps this theory to production element families: first-order and second-order tetrahedra, wedges, pyramids, and bricks, with reduced-integration, hybrid, incompatible-mode, thermal, pore-pressure, and piezoelectric variants.
|
||||
|
||||
## Practical Notes
|
||||
|
||||
- Solid elements are suited to three-dimensional volume response rather than beam or shell idealizations.
|
||||
@@ -63,8 +68,10 @@ The covered topologies are 4-node tetrahedron, 5-node pyramid, 6-node wedge, and
|
||||
- [[Solid Element Strain-Displacement Matrix]] converts the displacement interpolation into engineering strain components.
|
||||
- [[Solid Element Stiffness Integration]] assembles the stiffness matrix from `B`, `D`, and the Jacobian.
|
||||
- [[Axisymmetric Finite Elements]] are an efficient reduced-dimensional alternative when body and load symmetry permit.
|
||||
- [[Abaqus Continuum Element Families]] shows the Abaqus solid-element names and variants built on the same continuum interpolation idea.
|
||||
|
||||
## Sources
|
||||
|
||||
- [[Solid Element Notes]]
|
||||
- [[A-First-Course-in-the-Finite-Element-Method|A First Course in the Finite Element Method]]
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]
|
||||
|
||||
@@ -8,7 +8,7 @@ aliases:
|
||||
- Mixed Interpolation of Tensorial Components shell element
|
||||
- four-node quadrilateral MITC shell
|
||||
created: 2026-05-28
|
||||
updated: 2026-05-28
|
||||
updated: 2026-06-01
|
||||
address: c-000023
|
||||
tags:
|
||||
- concept
|
||||
@@ -32,11 +32,14 @@ related:
|
||||
- "[[Assumed Transverse Shear Strain Interpolation]]"
|
||||
- "[[Scordelis-Lo Shell Benchmark]]"
|
||||
- "[[OOFEM]]"
|
||||
- "[[Abaqus Structural Element Families]]"
|
||||
- "[[Abaqus Beam and Shell Section Definitions]]"
|
||||
sources:
|
||||
- "[[On-the-Finite-Element-Analysis-of-Shell-Structures]]"
|
||||
- "[[Four-Node-Quadrilateral-Shell-Element-MITC4]]"
|
||||
- "[[MITC Study Notes]]"
|
||||
- "[[Dynamic-Buckling-Analysis-of-Shell-Structures-using-Finite-Element-Method]]"
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]"
|
||||
---
|
||||
|
||||
# MITC4 Shell Element
|
||||
@@ -55,6 +58,8 @@ The dynamic buckling thesis uses MITC4 as the shell element for a full analysis
|
||||
|
||||
[[On-the-Finite-Element-Analysis-of-Shell-Structures]] places MITC in the broader shell FE reliability problem: mixed interpolation should reduce [[Shell Locking Phenomenon]] in bending and mixed-dominated shells while preserving consistency and ellipticity in membrane-dominated shells.
|
||||
|
||||
[[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]] provides the production shell-library context around this research thread: conventional shells, continuum shells, axisymmetric shells, shell section definitions, reduced integration, and hourglass/drill stiffness controls are the practical choices analysts see when selecting elements such as `S4R` or `SC8R`.
|
||||
|
||||
## Why It Matters
|
||||
|
||||
Low-order shell elements are computationally attractive, but thin-shell bending exposes shear locking if the element cannot represent near-zero transverse shear strain. MITC4 preserves the economy of a four-node quadrilateral while making the element usable across thick and thin shells.
|
||||
@@ -73,3 +78,4 @@ The paper reports patch-test verification for pure bending, pure shear, pure twi
|
||||
- [[MITC Study Notes]]
|
||||
- [[Dynamic-Buckling-Analysis-of-Shell-Structures-using-Finite-Element-Method]]
|
||||
- [[On-the-Finite-Element-Analysis-of-Shell-Structures]]
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]
|
||||
|
||||
@@ -7,7 +7,7 @@ aliases:
|
||||
- nonlinear FEA
|
||||
- incremental finite element analysis
|
||||
created: 2026-05-28
|
||||
updated: 2026-05-29
|
||||
updated: 2026-06-01
|
||||
address: c-000011
|
||||
tags:
|
||||
- concept
|
||||
@@ -27,6 +27,9 @@ related:
|
||||
- "[[Dynamic Buckling Analysis]]"
|
||||
- "[[Abaqus Analysis Procedures]]"
|
||||
- "[[Abaqus Constitutive Integration]]"
|
||||
- "[[Abaqus Metal Plasticity Models]]"
|
||||
- "[[Abaqus Hyperelastic and Viscoelastic Materials]]"
|
||||
- "[[Abaqus Progressive Damage and Failure]]"
|
||||
- "[[Finite Element Contact Formulation]]"
|
||||
sources:
|
||||
- "[[Finite Element Procedures]]"
|
||||
@@ -34,6 +37,7 @@ sources:
|
||||
- "[[MITC Study Notes]]"
|
||||
- "[[Dynamic-Buckling-Analysis-of-Shell-Structures-using-Finite-Element-Method]]"
|
||||
- "[[Abaqus Theory Manual]]"
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]]"
|
||||
---
|
||||
|
||||
# Nonlinear Finite Element Analysis
|
||||
@@ -54,6 +58,8 @@ The dynamic buckling thesis uses geometric nonlinearity to build the geometric s
|
||||
|
||||
[[Abaqus Theory Manual]] adds the production-analysis view: nonlinear procedures rely on residual equations, tangent matrices, Newton or quasi-Newton corrections, automatic increments, cutbacks, material Jacobians, and changing contact constraints.
|
||||
|
||||
[[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]] expands the material-nonlinearity side: hyperelasticity, viscoelasticity, plasticity, pressure-dependent geomaterials, concrete, progressive damage, EOS behavior, and user-defined material updates all introduce state dependence into the nonlinear finite element problem.
|
||||
|
||||
## Why It Matters
|
||||
|
||||
Many engineering failures, large deformation behaviors, buckling events, contact interactions, and elastoplastic responses cannot be captured by a single linear solve. Nonlinear analysis adds physical realism but also adds dependence on increments, tangent quality, convergence tests, and path-following strategy.
|
||||
@@ -65,6 +71,7 @@ Many engineering failures, large deformation behaviors, buckling events, contact
|
||||
- Are increments small enough to follow the equilibrium path?
|
||||
- Do convergence criteria reflect the physical quantity of interest?
|
||||
- Are material updates and contact constraints supplying a tangent that matches the active nonlinear state?
|
||||
- Is the selected material model path-dependent, rate-dependent, damage-softening, or nearly incompressible?
|
||||
|
||||
## Sources
|
||||
|
||||
@@ -73,3 +80,4 @@ Many engineering failures, large deformation behaviors, buckling events, contact
|
||||
- [[MITC Study Notes]]
|
||||
- [[Dynamic-Buckling-Analysis-of-Shell-Structures-using-Finite-Element-Method]]
|
||||
- [[Abaqus Theory Manual]]
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]]
|
||||
|
||||
@@ -4,7 +4,7 @@ title: "Reduced Integration and Hourglass Control"
|
||||
complexity: advanced
|
||||
domain: computational-mechanics
|
||||
created: 2026-05-29
|
||||
updated: 2026-05-29
|
||||
updated: 2026-06-01
|
||||
address: c-000057
|
||||
aliases:
|
||||
- reduced integration
|
||||
@@ -18,13 +18,17 @@ tags:
|
||||
status: current
|
||||
related:
|
||||
- "[[Abaqus Theory Manual]]"
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]"
|
||||
- "[[Abaqus Element Library]]"
|
||||
- "[[Abaqus Element Selection and Formulation]]"
|
||||
- "[[Abaqus Continuum Element Families]]"
|
||||
- "[[Isoparametric Finite Elements]]"
|
||||
- "[[Solid Element Stiffness Integration]]"
|
||||
- "[[Shell Locking Phenomenon]]"
|
||||
- "[[Hybrid Incompressible Elements]]"
|
||||
sources:
|
||||
- "[[Abaqus Theory Manual]]"
|
||||
- "[[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]"
|
||||
---
|
||||
|
||||
# Reduced Integration and Hourglass Control
|
||||
@@ -39,6 +43,8 @@ Reduced integration can reduce computational cost and, in some element families,
|
||||
|
||||
The risk is rank deficiency: some displacement patterns can produce little or no strain energy at the reduced integration points. These patterns appear as hourglass or zero-energy modes. Abaqus controls them by adding artificial stiffness or related stabilization terms so the element remains usable without losing the intended benefits of reduced quadrature.
|
||||
|
||||
[[Abaqus-Analysis-User-s-Guide-Volume-IV|Volume IV]] shows how this becomes a naming and selection issue. Many Abaqus element names use `R` to mark reduced integration, such as `C3D8R` and `S4R`, and the element family determines which hourglass-control assumptions are appropriate.
|
||||
|
||||
## Why It Matters
|
||||
|
||||
Reduced integration is not just a cheaper quadrature rule. It changes the numerical behavior of the element and must be judged together with element topology, mesh distortion, material behavior, contact, and expected deformation mode.
|
||||
@@ -47,10 +53,12 @@ Reduced integration is not just a cheaper quadrature rule. It changes the numeri
|
||||
|
||||
- [[Isoparametric Finite Elements]] supplies the quadrature framework.
|
||||
- [[Abaqus Element Library]] places reduced integration among full, selective, and hybrid element choices.
|
||||
- [[Abaqus Element Selection and Formulation]] connects reduced integration to element suffixes and analysis-product availability.
|
||||
- [[Abaqus Continuum Element Families]] shows where reduced-integration solid and coupled-field variants appear.
|
||||
- [[Shell Locking Phenomenon]] is one reason under-integration or assumed-strain methods are introduced.
|
||||
- [[Hybrid Incompressible Elements]] is a more explicit mixed alternative for incompressible response.
|
||||
|
||||
## Sources
|
||||
|
||||
- [[Abaqus Theory Manual]]
|
||||
|
||||
- [[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]
|
||||
|
||||
+69
-1
@@ -1,7 +1,7 @@
|
||||
---
|
||||
type: meta
|
||||
title: "Concepts Index"
|
||||
updated: 2026-05-29
|
||||
updated: 2026-06-01
|
||||
tags:
|
||||
- meta
|
||||
- index
|
||||
@@ -22,6 +22,29 @@ related:
|
||||
- "[[Isoparametric Linear Solid Elements]]"
|
||||
- "[[Abaqus Analysis Procedures]]"
|
||||
- "[[Abaqus Element Library]]"
|
||||
- "[[Abaqus Element Selection and Formulation]]"
|
||||
- "[[Abaqus Continuum Element Families]]"
|
||||
- "[[Abaqus Structural Element Families]]"
|
||||
- "[[Abaqus Beam and Shell Section Definitions]]"
|
||||
- "[[Abaqus Inertial Rigid and Capacitance Elements]]"
|
||||
- "[[Abaqus Connector Elements and Behaviors]]"
|
||||
- "[[Abaqus Cohesive and Gasket Elements]]"
|
||||
- "[[Abaqus Special-Purpose Interaction Elements]]"
|
||||
- "[[Abaqus Fluid Acoustic Eulerian and Particle Elements]]"
|
||||
- "[[Abaqus User-Defined Elements]]"
|
||||
- "[[Abaqus Element Indexes and Naming Conventions]]"
|
||||
- "[[Abaqus Prescribed Conditions and Amplitudes]]"
|
||||
- "[[Abaqus Initial and Boundary Conditions]]"
|
||||
- "[[Abaqus Loads and Predefined Fields]]"
|
||||
- "[[Abaqus Kinematic Constraints and MPCs]]"
|
||||
- "[[Abaqus Surface-Based Constraints and Couplings]]"
|
||||
- "[[Abaqus Embedded Elements and Overconstraints]]"
|
||||
- "[[Abaqus Contact Interaction Definition]]"
|
||||
- "[[Abaqus Contact Property Models]]"
|
||||
- "[[Abaqus Contact Formulations and Enforcement]]"
|
||||
- "[[Abaqus Contact Diagnostics and Modeling Difficulties]]"
|
||||
- "[[Abaqus Standard Contact Elements]]"
|
||||
- "[[Abaqus Cavity Radiation Interactions]]"
|
||||
- "[[Abaqus Input File Syntax]]"
|
||||
- "[[Abaqus Spatial Model Definition]]"
|
||||
- "[[Abaqus Surface and Assembly Modeling]]"
|
||||
@@ -41,6 +64,17 @@ related:
|
||||
- "[[Abaqus Multiphysics Coupling and Co-simulation]]"
|
||||
- "[[Abaqus Structural Optimization and Parametric Studies]]"
|
||||
- "[[Abaqus User Subroutines and Utility Routines]]"
|
||||
- "[[Abaqus Material Library and Data Definition]]"
|
||||
- "[[Abaqus Elastic Material Models]]"
|
||||
- "[[Abaqus Hyperelastic and Viscoelastic Materials]]"
|
||||
- "[[Abaqus Metal Plasticity Models]]"
|
||||
- "[[Abaqus Geomaterial and Concrete Plasticity]]"
|
||||
- "[[Abaqus Progressive Damage and Failure]]"
|
||||
- "[[Abaqus Hydrodynamic Equation of State Materials]]"
|
||||
- "[[Abaqus Thermal Expansion and Damping Materials]]"
|
||||
- "[[Abaqus Transport Acoustic and Electromagnetic Materials]]"
|
||||
- "[[Abaqus Porous Media and Pore Fluid Materials]]"
|
||||
- "[[Abaqus User-Defined Material Behavior]]"
|
||||
- "[[Reduced Integration and Hourglass Control]]"
|
||||
- "[[Hybrid Incompressible Elements]]"
|
||||
- "[[Abaqus Constitutive Integration]]"
|
||||
@@ -78,6 +112,29 @@ All concept pages: finite-element and computational-mechanics concepts extracted
|
||||
- [[Nonlinear Finite Element Analysis]] - incremental solution of geometric, material, contact, and load nonlinearities
|
||||
- [[Abaqus Analysis Procedures]] - Abaqus procedure families for nonlinear, dynamic, modal, buckling, coupled-field, and special analyses
|
||||
- [[Abaqus Element Library]] - Abaqus element formulations, interpolation, numerical integration, and multi-field element choices
|
||||
- [[Abaqus Element Selection and Formulation]] - Abaqus element family, degrees of freedom, interpolation, formulation, and integration selection workflow
|
||||
- [[Abaqus Continuum Element Families]] - Abaqus solid, fluid continuum, infinite, warping, and coupled-field continuum elements
|
||||
- [[Abaqus Structural Element Families]] - Abaqus membrane, truss, beam, frame, elbow, shell, continuum shell, and axisymmetric shell elements
|
||||
- [[Abaqus Beam and Shell Section Definitions]] - beam cross-sections, shell thickness, composite layers, and section integration
|
||||
- [[Abaqus Inertial Rigid and Capacitance Elements]] - concentrated mass, rotary inertia, rigid geometry, and point heat capacitance
|
||||
- [[Abaqus Connector Elements and Behaviors]] - connector topology, connection types, actuation, and nonlinear connector behavior
|
||||
- [[Abaqus Cohesive and Gasket Elements]] - cohesive interface, traction-separation, pore-pressure cohesive, and gasket behavior
|
||||
- [[Abaqus Special-Purpose Interaction Elements]] - springs, dashpots, joints, couplings, surface elements, line springs, pipe-soil, and acoustic interfaces
|
||||
- [[Abaqus Fluid Acoustic Eulerian and Particle Elements]] - acoustic, fluid, Eulerian, fluid pipe, DEM, and SPH element workflows
|
||||
- [[Abaqus User-Defined Elements]] - UEL, UELMAT, VUEL, custom DOFs, state variables, and user-element limitations
|
||||
- [[Abaqus Element Indexes and Naming Conventions]] - element prefixes, suffixes, formulation markers, and Standard/Explicit/CFD indexes
|
||||
- [[Abaqus Prescribed Conditions and Amplitudes]] - prescribed-condition classes, amplitude curves, and time-history rules
|
||||
- [[Abaqus Initial and Boundary Conditions]] - initial values, boundary conditions, propagation, modification, and removal
|
||||
- [[Abaqus Loads and Predefined Fields]] - concentrated, distributed, thermal, electromagnetic, acoustic, pore-fluid, pretension, connector, and predefined-field workflows
|
||||
- [[Abaqus Kinematic Constraints and MPCs]] - linear equations, multi-point constraints, user MPCs, and kinematic couplings
|
||||
- [[Abaqus Surface-Based Constraints and Couplings]] - tie, coupling, shell-to-solid, and surface-based constraint workflows
|
||||
- [[Abaqus Embedded Elements and Overconstraints]] - embedded elements, element end release, and overconstraint diagnostics
|
||||
- [[Abaqus Contact Interaction Definition]] - general contact, contact pair, and contact element definition workflow
|
||||
- [[Abaqus Contact Property Models]] - normal, frictional, damping, cohesive, thermal, electrical, and pore-fluid contact properties
|
||||
- [[Abaqus Contact Formulations and Enforcement]] - contact discretization, sliding, penalty, Lagrange multiplier, and augmented enforcement choices
|
||||
- [[Abaqus Contact Diagnostics and Modeling Difficulties]] - contact overclosure, surface quality, redundant constraint, and diagnostic workflows
|
||||
- [[Abaqus Standard Contact Elements]] - Abaqus/Standard gap, tube-to-tube, slide line, and rigid surface contact elements
|
||||
- [[Abaqus Cavity Radiation Interactions]] - enclosure radiation, view factors, emissivity, open/closed cavities, and parallel cavity decomposition
|
||||
- [[Abaqus Input File Syntax]] - keyword, data-line, model-data, and history-data syntax for Abaqus input files
|
||||
- [[Abaqus Spatial Model Definition]] - nodes, elements, sets, coordinate systems, and spatial model topology in Abaqus
|
||||
- [[Abaqus Surface and Assembly Modeling]] - named surfaces and part-instance assemblies for contact, loads, constraints, and output
|
||||
@@ -97,6 +154,17 @@ All concept pages: finite-element and computational-mechanics concepts extracted
|
||||
- [[Abaqus Multiphysics Coupling and Co-simulation]] - sequential predefined-field coupling and runtime solver co-simulation
|
||||
- [[Abaqus Structural Optimization and Parametric Studies]] - structural optimization, design sensitivity, and scripted parametric studies
|
||||
- [[Abaqus User Subroutines and Utility Routines]] - compiled extension points, utility routines, and external database hooks
|
||||
- [[Abaqus Material Library and Data Definition]] - material blocks, behavior combinations, temperature/field dependencies, distributions, and density
|
||||
- [[Abaqus Elastic Material Models]] - linear, modified, porous, and hypoelastic material definitions
|
||||
- [[Abaqus Hyperelastic and Viscoelastic Materials]] - large-strain elastomer, foam, Mullins, permanent-set, and viscoelastic behavior
|
||||
- [[Abaqus Metal Plasticity Models]] - metal plasticity, hardening, rate dependence, creep, annealing, Johnson-Cook, and specialized metal models
|
||||
- [[Abaqus Geomaterial and Concrete Plasticity]] - pressure-dependent geomaterial, foam, jointed-media, and concrete plasticity
|
||||
- [[Abaqus Progressive Damage and Failure]] - damage initiation, evolution, mesh regularization, composite damage, fatigue damage, and element deletion
|
||||
- [[Abaqus Hydrodynamic Equation of State Materials]] - Abaqus/Explicit pressure-density-energy EOS material behavior
|
||||
- [[Abaqus Thermal Expansion and Damping Materials]] - damping, thermal expansion, field expansion, and viscosity material definitions
|
||||
- [[Abaqus Transport Acoustic and Electromagnetic Materials]] - thermal, acoustic, diffusion, electrical, piezoelectric, dielectric, and magnetic material properties
|
||||
- [[Abaqus Porous Media and Pore Fluid Materials]] - permeability, porous bulk moduli, sorption, swelling gel, and moisture swelling
|
||||
- [[Abaqus User-Defined Material Behavior]] - UMAT, VUMAT, UMATHT, state variables, material Jacobians, and deletion flags
|
||||
- [[Reduced Integration and Hourglass Control]] - under-integration tradeoffs, zero-energy modes, and stabilization
|
||||
- [[Hybrid Incompressible Elements]] - mixed displacement-pressure treatment for incompressible and nearly incompressible materials
|
||||
- [[Abaqus Constitutive Integration]] - material-point stress updates, state variables, and consistent material tangents
|
||||
|
||||
Reference in New Issue
Block a user