김경종
214 lines
9.5 KiB
Markdown
214 lines
9.5 KiB
Markdown
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Contact modeling if substructures are present 37.3.9
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Contact modeling if asymmetric-axisymmetric elements are present 37.3.10
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# Defining general contact in Abaqus/Explicit
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Defining general contact interactions in Abaqus/Explicit 37.4.1
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Assigning surface properties for general contact in Abaqus/Explicit 37.4.2
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Assigning contact properties for general contact in Abaqus/Explicit 37.4.3
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Controlling initial contact status for general contact in Abaqus/Explicit 37.4.4
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Contact controls for general contact in Abaqus/Explicit 37.4.5
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# Defining contact pairs in Abaqus/Explicit
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Defining contact pairs in Abaqus/Explicit 37.5.1
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Assigning surface properties for contact pairs in Abaqus/Explicit 37.5.2
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Assigning contact properties for contact pairs in Abaqus/Explicit 37.5.3
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Adjusting initial surface positions and specifying initial clearances for contact pairs in Abaqus/Explicit 37.5.4
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Contact controls for contact pairs in Abaqus/Explicit 37.5.5
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# 38. Contact Property Models
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# Mechanical contact properties
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Mechanical contact properties: overview 38.1.1
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Contact pressure-overclosure relationships 38.1.2
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Contact damping 38.1.3
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Contact blockage 38.1.4
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Frictional behavior 38.1.5
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User-defined interfacial constitutive behavior 38.1.6
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Pressure penetration loading 38.1.7
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Interaction of debonded surfaces 38.1.8
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Breakable bonds 38.1.9
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Surface-based cohesive behavior 38.1.10
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# Thermal contact properties
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Thermal contact properties 38.2.1
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# Electrical contact properties
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Electrical contact properties 38.3.1
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# Pore fluid contact properties
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Pore fluid contact properties 38.4.1
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# 39. Contact Formulations and Numerical Methods
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# Contact formulations and numerical methods in Abaqus/Standard
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Contact formulations in Abaqus/Standard 39.1.1
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Contact constraint enforcement methods in Abaqus/Standard 39.1.2
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Smoothing contact surfaces in Abaqus/Standard 39.1.3
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# Contact formulations and numerical methods in Abaqus/Explicit
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Contact formulation for general contact in Abaqus/Explicit 39.2.1
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Contact formulations for contact pairs in Abaqus/Explicit 39.2.2
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Contact constraint enforcement methods in Abaqus/Explicit 39.2.3
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# 40. Contact Difficulties and Diagnostics
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# Resolving contact difficulties in Abaqus/Standard
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Contact diagnostics in an Abaqus/Standard analysis 40.1.1
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Common difficulties associated with contact modeling in Abaqus/Standard 40.1.2
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# Resolving contact difficulties in Abaqus/Explicit
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Contact diagnostics in an Abaqus/Explicit analysis 40.2.1
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Common difficulties associated with contact modeling using contact pairs in Abaqus/Explicit 40.2.2
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# 41. Contact Elements in Abaqus/Standard
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# Contact modeling with elements
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Contact modeling with elements 41.1.1
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# Gap contact elements
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Gap contact elements 41.2.1
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Gap element library 41.2.2
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# Tube-to-tube contact elements
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Tube-to-tube contact elements 41.3.1
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Tube-to-tube contact element library 41.3.2
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# Slide line contact elements
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Slide line contact elements 41.4.1
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Axisymmetric slide line element library 41.4.2
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# Rigid surface contact elements
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Rigid surface contact elements 41.5.1
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Axisymmetric rigid surface contact element library 41.5.2
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# 42. Defining Cavity Radiation in Abaqus/Standard
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# Defining cavity radiation
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Cavity radiation 42.1.1
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# Part VII: Prescribed Conditions
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• Chapter 34, “Prescribed Conditions”
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# 34. Prescribed Conditions
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Overview 34.1
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Initial conditions 34.2
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Boundary conditions 34.3
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Loads 34.4
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Prescribed assembly loads 34.5
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Predefined fields 34.6
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# 34.1 Overview
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• “Prescribed conditions: overview,” Section 34.1.1
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• “Amplitude curves,” Section 34.1.2
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# 34.1.1 PRESCRIBED CONDITIONS: OVERVIEW
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The following types of external conditions can be prescribed in an Abaqus model:
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• Initial conditions: Nonzero initial conditions can be defined for many variables, as described in “Initial conditions in Abaqus/Standard and Abaqus/Explicit,” Section 34.2.1, and “Initial conditions in Abaqus/CFD,” Section 34.2.2.
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• Boundary conditions: Boundary conditions are used to prescribe values of basic solution variables: displacements and rotations in stress/displacement analysis, temperature in heat transfer or coupled thermal-stress analysis, electrical potential in coupled thermal-electrical analysis, pore pressure in soils analysis, acoustic pressure in acoustic analysis, etc. Boundary conditions can be defined as described in “Boundary conditions in Abaqus/Standard and Abaqus/Explicit,” Section 34.3.1, and “Boundary conditions in Abaqus/CFD,” Section 34.3.2.
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• Loads: Many types of loading are available, depending on the analysis procedure. “Applying loads: overview,” Section 34.4.1, gives an overview of loading in Abaqus. Load types specific to one analysis procedure are described in the appropriate procedure section in Part III, “Analysis Procedures, Solution, and Control.” General loads, which can be applied in multiple analysis types, are described in:
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– “Concentrated loads,” Section 34.4.2
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– “Distributed loads,” Section 34.4.3
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– “Thermal loads,” Section 34.4.4
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– “Electromagnetic loads,” Section 34.4.5
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– “Acoustic and shock loads,” Section 34.4.6
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– “Pore fluid flow,” Section 34.4.7
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• Prescribed assembly loads: Pre-tension sections can be defined in Abaqus/Standard to prescribe assembly loads in bolts or any other type of fastener. Pre-tension sections are described in “Prescribed assembly loads,” Section 34.5.1.
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• Connector loads and motions: Connector elements can be used to define complex mechanical connections between parts, including actuation with prescribed loads or motions. Connector elements are described in “Connectors: overview,” Section 31.1.1.
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• Predefined fields: Predefined fields are time-dependent, non-solution-dependent fields that exist over the spatial domain of the model. Temperature is the most commonly defined field. Predefined fields are described in “Predefined fields,” Section 34.6.1.
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# Amplitude variations
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Complex time- or frequency-dependent boundary conditions, loads, and predefined fields can be specified by referring to an amplitude curve in the prescribed condition definition. Amplitude curves are explained in “Amplitude curves,” Section 34.1.2.
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In Abaqus/Standard if no amplitude is referenced from the boundary condition, loading, or predefined field definition, the total magnitude can be applied instantaneously at the start of the step and
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remain constant throughout the step (a “step” variation) or it can vary linearly over the step from the value at the end of the previous step (or from zero at the start of the analysis) to the magnitude given (a “ramp” variation). You choose the type of variation when you define the step; the default variation depends on the procedure chosen, as shown in “Defining an analysis,” Section 6.1.2.
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In Abaqus/Standard the variation of many prescribed conditions can be defined in user subroutines. In this case the magnitude of the variable can vary in any way with position and time. The magnitude variation for prescribing and removing conditions must be specified in the subroutine (see “User subroutines and utilities,” Section 18.1”).
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In Abaqus/Explicit if no amplitude is referenced from the boundary condition or loading definition, the total value will be applied instantaneously at the start of the step and will remain constant throughout the step (a “step” variation), although Abaqus/Explicit does not admit jumps in displacement (see “Boundary conditions in Abaqus/Standard and Abaqus/Explicit,” Section 34.3.1). If no amplitude is referenced from a predefined field definition, the total magnitude will vary linearly over the step from the value at the end of the previous step (or from zero at the start of the analysis) to the magnitude given (a “ramp” variation).
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When boundary conditions are removed (see “Boundary conditions in Abaqus/Standard and Abaqus/Explicit,” Section 34.3.1), the boundary condition (displacement or rotation constraint in stress/displacement analysis) is converted to an applied conjugate flux (force or moment in stress/displacement analysis) at the beginning of the step. This flux magnitude is set to zero with a “step” or “ramp” variation depending on the procedure chosen, as discussed in “Defining an analysis,” Section 6.1.2. Similarly, when loads and predefined fields are removed, the load is set to zero and the predefined field is set to its initial value.
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In Abaqus/CFD if no amplitude is referenced from the boundary or loading condition, the total value is applied instantaneously at the start of the step and remains constant throughout the step. Abaqus/CFD does admit jumps in the velocity, temperature, etc. from the end value of the previous step to the magnitude given in the current step. However, jumps in velocity boundary conditions may result in a divergence-free projection that adjusts the initial velocities to be consistent with the prescribed boundary conditions in order to define a well-posed incompressible flow problem.
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# Applying boundary conditions and loads in a local coordinate system
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You can define a local coordinate system at a node as described in “Transformed coordinate systems,” Section 2.1.5. Then, all input data for concentrated force and moment loading and for displacement and rotation boundary conditions are given in the local system.
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