김경종
74 lines
2.9 KiB
Markdown
74 lines
2.9 KiB
Markdown
---
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type: concept
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title: "Abaqus Kinematic Constraints and MPCs"
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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-000120
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aliases:
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- Abaqus MPCs
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- Abaqus multi-point constraints
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- Abaqus linear constraint equations
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tags:
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- concept
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- finite-element-method
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- abaqus
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- constraints
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- mpc
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status: current
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related:
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- "[[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]"
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- "[[Abaqus Surface-Based Constraints and Couplings]]"
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- "[[Abaqus Embedded Elements and Overconstraints]]"
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- "[[Mixed Finite Element Formulations]]"
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- "[[Abaqus User Subroutines and Utility Routines]]"
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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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source_refs:
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- source: "[[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]"
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raw_path: ".raw/AbaqusAnalysisUserGuide5/"
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raw_files:
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- "AbaqusAnalysisUserGuide5_026.md"
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- "AbaqusAnalysisUserGuide5_027.md"
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- "AbaqusAnalysisUserGuide5_030.md"
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- "AbaqusAnalysisUserGuide5_028.md"
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md_indices:
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- 26
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- 27
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- 30
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- 28
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match: "heuristic-heading-keyword"
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confidence: high
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---
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# Abaqus Kinematic Constraints and MPCs
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## Definition
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Abaqus kinematic constraints and MPCs impose algebraic relationships among nodal degrees of freedom beyond ordinary element connectivity.
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## How They Work
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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.
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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.
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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.
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## Why It Matters
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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.
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## Connections
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- [[Abaqus Surface-Based Constraints and Couplings]] covers the surface-region branch of the constraint workflow.
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- [[Abaqus Embedded Elements and Overconstraints]] covers constraint conflicts and diagnostic checks.
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- [[Mixed Finite Element Formulations]] supplies the broader constraint-enforcement context.
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- [[Abaqus User Subroutines and Utility Routines]] covers the user-code path for custom MPCs.
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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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