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Workflow for fatigue and durability analysis - cycle counting, damage accumulation, and fatigue life prediction.
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Based on SOC occupation classification
Orchestrate evidence-backed ANSYS Workbench and Mechanical structural analyses through a configured MCP, including capability discovery, existing-project or CAD intake, materials, named selections, connections, loads, high-quality mesh planning and repair, solving, convergence diagnosis, deterministic validation, and report export. Use for linear static, nonlinear static, contact, modal, eigenvalue buckling, or related structural-analysis work when Codex must operate or inspect a live Workbench session instead of only explaining theory.
Use this skill when driving CST Studio Suite through the CST MCP for electromagnetic simulation workflows: creating or opening CST projects, resolving missing inputs, selecting templates, setting up geometry/materials/ports/boundaries/mesh/solvers/monitors, running or planning simulations, extracting S-parameters/far-field/near-field/eigenmode results, validating outputs, parameter sweeps, optimization handoff, and report generation.
CST Studio Suite 正式生产入口。覆盖 session 管理、几何建模、参数优化、仿真、S11/远场结果读取和审计落盘。当用户要求使用 CLI/runtime 执行 CST 操作时调用此 Skill。
当用户要求使用 CLI/runtime 执行 CST 参数优化循环、S11 指标迭代、多轮仿真对比时调用此 Skill。本 Skill 依赖 cst-runtime-cli 提供基础设施，不携带 runtime scripts，所有 CLI 调用走 base skill 的 uv run python -m cst_runtime 入口。
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.
| 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: