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Workflow for fatigue and durability analysis - cycle counting, damage accumulation, and fatigue life prediction.
Codex 또는 Claude로 설치 이 Prompt를 복사해 Codex, Claude 또는 다른 어시스턴트에 붙여 넣으면 Skill 페이지를 검토하고 설치를 진행할 수 있습니다.
SOC 직업 분류 기준
| name | abaqus-fatigue-analysis |
| description | Workflow for fatigue and durability analysis - cycle counting, damage accumulation, and fatigue life prediction. |
| allowed-tools | ["Read","Write","Edit","Glob","Grep","Bash(abaqus:*)","Skill"] |
Predict fatigue life from FEA stress results using S-N curves and damage accumulation.
Route here when user mentions:
Route elsewhere:
/abaqus-static-analysis/abaqus-static-analysisAbaqus has limited native fatigue capabilities. The typical workflow is:
For full fatigue analysis, consider external tools: fe-safe, nCode, FEMFAT.
Before fatigue analysis:
Use /abaqus-static-analysis for constant loads or /abaqus-dynamic-analysis for time-varying.
Ensure output requests include:
S - Stress components (principal, Mises)E - Strain componentsPEEQ - Equivalent plastic strain (for low-cycle)Find the maximum stress location:
/abaqus-odb to extract peak stressFor constant amplitude: single max/min stress values. For variable amplitude: full stress-time history for rainflow counting.
Use appropriate method based on loading and life regime.
Apply Basquin equation for life, Miner's rule for cumulative damage.
| Approach | When to Use | Data Needed |
|---|---|---|
| Stress-life (S-N) | High-cycle (N > 10^4) | S-N curve |
| Strain-life (e-N) | Low-cycle (N < 10^4) | Coffin-Manson params |
| Fracture mechanics | Crack growth | da/dN curve |
| Loading | Analysis Method |
|---|---|
| Constant amplitude | Single static analysis |
| Variable amplitude | Multiple loads + rainflow |
| Proportional | Single load case |
| Non-proportional | Critical plane method |
| Method | Use Case |
|---|---|
| Goodman | Conservative, tensile mean |
| Gerber | Less conservative |
| Soderberg | Very conservative |
| SWT | Strain-life with mean stress |
If unclear, ask:
| Parameter | Typical Values | Notes |
|---|---|---|
| S-N slope (b) | 0.08-0.15 | Lower = longer life |
| Endurance limit | 40-50% UTS (steel) | Stress below which infinite life |
| Fatigue notch factor (Kf) | 1.0-3.0 | Kf = 1 + q(Kt-1) |
| Notch sensitivity (q) | 0.7-0.95 | Higher for stronger steels |
| Problem | Cause | Solution |
|---|---|---|
| Unrealistically short life | Stress singularity | Use Kf correction, refine mesh away from singularity |
| Wrong units | MPa vs Pa mismatch | Verify stress units match S-N data |
| Unconservative prediction | Missing mean stress | Apply Goodman/Gerber correction |
| Very long calculated life | Stress below endurance limit | Check if stress > endurance limit |
/abaqus-static-analysis - Base stress analysis/abaqus-dynamic-analysis - Time-varying loading/abaqus-amplitude - Cyclic loading definition/abaqus-odb - Extract stress history from resultsFor API syntax, equations, and code examples, see:
Define time-varying amplitudes. Use when user mentions ramp, time-varying, cyclic, pulse, or gradually increasing loads. Does NOT handle static constant loads.
Analyze multi-body contact. Use when user mentions parts touching, friction between surfaces, bolt-plate contact, press fit, or assembly with contact.
Complete workflow for coupled thermomechanical analysis. Use when user mentions thermal stress, thermal expansion, or temperature causing deformation.
Download and manage abqpy API documentation. Use when user asks about API documentation, API reference, or downloading Abaqus docs.
Complete workflow for dynamic analysis. Use when user mentions impact, crash, drop test, transient, or time-varying response. Handles explicit and implicit dynamics.
Define initial conditions and predefined fields. Use when user mentions initial temperature, pre-stress, residual stress, or import from previous analysis.