Babysitter fatigue-life-predictor

Fatigue life prediction skill for implants and load-bearing devices using validated approaches

install

source · Clone the upstream repo

git clone https://github.com/a5c-ai/babysitter

Claude Code · Install into ~/.claude/skills/

T=$(mktemp -d) && git clone --depth=1 https://github.com/a5c-ai/babysitter "$T" && mkdir -p ~/.claude/skills && cp -r "$T/library/specializations/domains/science/biomedical-engineering/skills/fatigue-life-predictor" ~/.claude/skills/a5c-ai-babysitter-fatigue-life-predictor && rm -rf "$T"

manifest: library/specializations/domains/science/biomedical-engineering/skills/fatigue-life-predictor/SKILL.md

Fatigue Life Predictor Skill

Purpose

The Fatigue Life Predictor Skill estimates fatigue life of medical implants and load-bearing devices using established methodologies per ASTM and ISO standards, supporting design verification and regulatory submissions.

Capabilities

S-N curve generation and analysis
Strain-life fatigue modeling
Multiaxial fatigue assessment
Fretting fatigue evaluation
Corrosion fatigue considerations
Goodman diagram construction
Run-out criteria application
Notch sensitivity analysis
Statistical treatment of fatigue data
Design allowable determination
Fatigue test correlation

Usage Guidelines

When to Use

Predicting implant fatigue life
Designing fatigue testing protocols
Correlating FEA with bench testing
Supporting design verification

Prerequisites

Stress analysis completed
Material fatigue properties available
Loading spectrum defined
Surface finish characterized

Best Practices

Use appropriate fatigue methodology for loading type
Account for mean stress effects
Consider physiological environment effects
Correlate predictions with bench testing

Process Integration

This skill integrates with the following processes:

Finite Element Analysis for Medical Devices
Orthopedic Implant Biomechanical Testing
Design Control Process Implementation
Verification and Validation Test Planning

Dependencies

fe-safe software
ANSYS nCode
ASTM F1717/F2077 standards
Material fatigue databases
FEA stress results

Configuration

fatigue-life-predictor:
  methodologies:
    - stress-life
    - strain-life
    - fracture-mechanics
  loading-types:
    - constant-amplitude
    - variable-amplitude
    - multiaxial
  mean-stress-corrections:
    - Goodman
    - Gerber
    - Morrow
  environment:
    - air
    - saline
    - body-fluid

Output Artifacts

Fatigue life predictions
S-N curves
Goodman diagrams
Safety factor calculations
Test correlation reports
Design recommendations
Statistical analysis results
Regulatory submission summaries

Quality Criteria

Methodology appropriate for loading conditions
Material data from validated sources
Mean stress effects properly accounted
Environmental factors considered
Predictions correlated with testing
Documentation supports regulatory review