ReddRadar
Agent skill
abaqus-material
Define material properties for FEA models. Use when user mentions steel, aluminum, Young's modulus, elastic, plastic, density, or asks about material properties.
Install this agent skill to your Project
npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/data/abaqus-material
SKILL.md
Abaqus Material Skill
Define material properties and assign sections to parts. This skill handles elastic, plastic, thermal, and composite material definitions.
When to Use This Skill
Route here when user mentions:
- "steel", "aluminum", "titanium", or other material names
- "Young's modulus", "elastic", "Poisson's ratio"
- "plastic", "yielding", "hardening"
- "density" for gravity/dynamics
- "thermal conductivity", "expansion"
- "assign material to part"
Route elsewhere:
- Contact properties (friction, damping) →
/abaqus-interaction - Optimization material interpolation →
/abaqus-optimization - Temperature boundary conditions →
/abaqus-field
Key Decisions
1. What Properties Are Needed?
| Analysis Type | Required | Optional |
|---|---|---|
| Static stress | E, ν | - |
| Static with gravity | E, ν, ρ | - |
| Yielding/plastic | E, ν, σy | ρ |
| Modal/frequency | E, ν, ρ | - |
| Dynamic explicit | E, ν, ρ | Plasticity |
| Thermal stress | E, ν, α | k, cp |
| Heat transfer only | k | cp, ρ |
Key insight: Density (ρ) is required whenever inertia matters - modal analysis, dynamics, gravity loads.
2. Common Material Values
| Material | E (MPa) | ν | ρ (t/mm³) | σy (MPa) |
|---|---|---|---|---|
| Steel (mild) | 210000 | 0.30 | 7.85e-9 | 250 |
| Steel (high-strength) | 210000 | 0.30 | 7.85e-9 | 550 |
| Stainless 304 | 193000 | 0.29 | 8.00e-9 | 215 |
| Aluminum 6061-T6 | 68900 | 0.33 | 2.70e-9 | 276 |
| Aluminum 7075-T6 | 71700 | 0.33 | 2.81e-9 | 503 |
| Titanium Ti-6Al-4V | 113800 | 0.34 | 4.43e-9 | 880 |
Unit system: mm-tonne-s-N-MPa (consistent SI)
3. Section Type Selection
| Geometry Type | Section Type | When to Use |
|---|---|---|
| 3D solid (hex/tet) | HomogeneousSolidSection | Most FEA models |
| Thin walls (t/L < 0.1) | HomogeneousShellSection | Plates, sheet metal |
| Slender members (L/d > 10) | BeamSection | Frames, trusses |
| Layered composites | CompositeShellSection | Carbon fiber, laminates |
What to Ask User
If unclear, ask:
- What material? Steel, aluminum, custom values?
- Need plasticity? Will stresses exceed yield?
- Need density? Is this for dynamics, modal, or gravity?
- Temperature effects? Thermal expansion, temperature-dependent properties?
Workflow
Step 1: Create Material
Create a material object with a descriptive name.
Step 2: Add Required Properties
At minimum, add elastic properties (E, ν). Add density if analysis requires it.
Step 3: Add Optional Properties
Add plasticity, thermal, or other properties as needed.
Step 4: Create Section
Create appropriate section type (solid, shell, beam) referencing the material.
Step 5: Assign Section to Part
Assign section to all cells/faces that need this material.
Validation Checklist
Before running analysis, verify:
- E > 0 (positive stiffness)
- -1 < ν < 0.5 (ν = 0.5 causes numerical issues)
- ρ > 0 if required for analysis type
- Plastic table starts at zero plastic strain
- Section assigned to ALL cells that need it
Troubleshooting
| Problem | Likely Cause | Solution |
|---|---|---|
| "Material has no density" | Analysis requires density | Add density property |
| "Negative eigenvalue in stiffness" | Invalid Poisson's ratio | Ensure -1 < ν < 0.5 |
| "Section not assigned" | Missing assignment call | Assign section to region |
| "Material X not found" | Typo in material name | Check spelling matches |
| "Region has no mesh" | Mesh order issue | Mesh after section assignment |
Code Patterns
For actual API syntax and code examples, see:
- API Quick Reference
- Materials Database
- Troubleshooting Guide
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