Fea

fea

This skill checks early structural strength and stiffness risks for robot-dog virtual prototypes. The MVP consumes FEA case metadata and writes deterministic reports. It does not run a solver yet; it provides a stable file contract for later CalculiX/Gmsh or FreeCAD FEM integration.

When To Use

Use this skill for:

• Static stress and safety-factor checks.
• Deflection and stiffness checks.
• Modal frequency checks against gait excitation.
• Drop or landing impact risk summaries.
• Producing fea_report.json for robot-dog-digital-twin gates.

Workflow

1. Read <project>/fea_cases.yaml.
2. Evaluate each part/case against material yield strength, safety factor, deflection, and modal limits.
3. Mark blockers for low safety factor, excessive deflection, or modal frequency too close to gait excitation.
4. Write reports into <project>/reports/.

Commands

python skills/fea/scripts/run_static_case.py skills/fea/examples/quadruped_mvp
python skills/fea/scripts/summarize_fea.py skills/fea/examples/quadruped_mvp

Rules

• Keep MVP checks deterministic and conservative.
• Treat safety factor below 2.0, deflection above the declared limit, or modal frequency ratio below 2.0 as blockers.
• Do not claim this replaces solver-backed FEA or physical load testing.
• Do not import sibling subskill code. Read files only.

References

• references/input-contract.md for fea_cases.yaml fields.
• references/load-cases.md for MVP case definitions.
• references/materials.md for material defaults.
• references/output-contract.md for report fields.
• references/examples.md for sample project layout.