김경종
54 lines
2.3 KiB
Markdown
54 lines
2.3 KiB
Markdown
---
|
|
type: concept
|
|
title: "Midas FEA Interface Elements and Nonlinearities"
|
|
created: 2026-06-02
|
|
updated: 2026-06-02
|
|
address: c-000148
|
|
aliases:
|
|
- MIDAS FEA interface elements
|
|
- midas FEA interface nonlinearities
|
|
tags:
|
|
- concept
|
|
- finite-element-method
|
|
- interface
|
|
- contact
|
|
- nonlinear-analysis
|
|
- midas-fea
|
|
status: current
|
|
related:
|
|
- "[[Midas-FEA-Analysis-Manual|Midas FEA Analysis Manual]]"
|
|
- "[[Midas FEA Element Library]]"
|
|
- "[[Midas FEA Static Contact Analysis]]"
|
|
- "[[Finite Element Contact Formulation]]"
|
|
- "[[Abaqus Cohesive and Gasket Elements]]"
|
|
- "[[Abaqus Contact Property Models]]"
|
|
sources:
|
|
- "[[Midas-FEA-Analysis-Manual|Midas FEA Analysis Manual]]"
|
|
---
|
|
|
|
# Midas FEA Interface Elements and Nonlinearities
|
|
|
|
## Definition
|
|
|
|
Midas FEA interface elements and nonlinearities model relative displacement and traction across points, lines, or surfaces, including cracks, bond-slip, friction, and masonry-like joint behavior.
|
|
|
|
## How It Works
|
|
|
|
The element-library side describes point, line, and surface interface elements and their finite element formulation in terms of relative displacement. The material-library side then assigns nonlinear laws such as discrete crack behavior, crack dilatancy, bond-slip, Coulomb friction, and combined cracking-shearing-crushing.
|
|
|
|
The manual emphasizes that normal and tangential interface behavior can be coupled. Crack dilatancy and frictional flow can introduce off-diagonal stiffness terms or nonsymmetric tangent behavior, which matters for solver selection and convergence.
|
|
|
|
## Solver Development Notes
|
|
|
|
- Store interface orientation and relative displacement components carefully.
|
|
- Treat interface elements separately from general contact: an interface element has predefined connectivity, while contact often needs search and active-set updates.
|
|
- Expect non-associated friction or dilatancy to produce nonsymmetric stiffness and slower convergence.
|
|
- Include element-level tests for normal opening, tangential slip, coupled dilation, and unloading/reloading.
|
|
|
|
## Connections
|
|
|
|
- [[Finite Element Contact Formulation]] gives the broader contact and interface context.
|
|
- [[Midas FEA Static Contact Analysis]] describes search-based contact in the same product.
|
|
- [[Abaqus Cohesive and Gasket Elements]] and [[Abaqus Contact Property Models]] give parallel production concepts.
|
|
|