김경종
51 lines
2.4 KiB
Markdown
51 lines
2.4 KiB
Markdown
---
|
|
type: concept
|
|
title: "Midas Civil Boundary and Material Nonlinear Analysis"
|
|
created: 2026-06-02
|
|
updated: 2026-06-02
|
|
address: c-000164
|
|
aliases:
|
|
- MIDAS Civil nonlinear analysis
|
|
- midas Civil material nonlinear analysis
|
|
tags:
|
|
- concept
|
|
- finite-element-method
|
|
- midas-civil
|
|
- nonlinear-analysis
|
|
- plasticity
|
|
status: current
|
|
related:
|
|
- "[[Midas-Civil-Analysis-Reference|Midas Civil Analysis Reference]]"
|
|
- "[[midas Civil]]"
|
|
- "[[Nonlinear Finite Element Analysis]]"
|
|
- "[[Finite Element Plasticity]]"
|
|
- "[[Midas FEA Nonlinear Solution Algorithms]]"
|
|
sources:
|
|
- "[[Midas-Civil-Analysis-Reference|Midas Civil Analysis Reference]]"
|
|
---
|
|
|
|
# Midas Civil Boundary and Material Nonlinear Analysis
|
|
|
|
## Definition
|
|
|
|
Midas Civil boundary and material nonlinear analysis is the incremental finite element workflow for nonlinear supports, nonlinear links, plastic material behavior, and path-dependent structural response.
|
|
|
|
## How It Works
|
|
|
|
The analysis reference includes Newton-Raphson iteration, arc-length methods, P-Delta effects, boundary nonlinear analysis, material nonlinear analysis, and pushover-related workflows. Material nonlinearity is described through plasticity theory, constitutive matrices, stress integration, plastic material models, and hardening laws such as perfectly plastic, isotropic, kinematic, and mixed hardening.
|
|
|
|
Boundary nonlinearity appears through support or link behavior whose stiffness changes with force state, gap/contact status, or hysteretic rule. The nonlinear solve must therefore update both element state and boundary/link state across increments and iterations.
|
|
|
|
## Solver Development Notes
|
|
|
|
- Each nonlinear feature needs state variables, trial-state updates, accepted-state commits, and rollback behavior.
|
|
- Newton methods require consistent residual, tangent, convergence norms, and line or increment control policies.
|
|
- Arc-length control is a requirement when the load-displacement path passes limit points.
|
|
- Boundary nonlinearities should share the same active-state and convergence infrastructure as material nonlinearities where possible.
|
|
|
|
## Connections
|
|
|
|
- [[Nonlinear Finite Element Analysis]] is the general nonlinear FE context.
|
|
- [[Finite Element Plasticity]], [[Plasticity Yield Criteria]], and [[Plastic Flow Rules and Hardening]] provide the plasticity theory layer.
|
|
- [[Midas FEA Nonlinear Solution Algorithms]] is the sibling product algorithm reference.
|