fatigue-dt

# Fatigue and Damage Tolerance Skill ## Purpose Provide specialized fatigue life prediction and damage tolerance assessment capabilities for airworthiness certification and structural integrity management. ## Capabilities - S-N and strain-life analysis - Crack growth analysis (NASGRO, AFGROW) - Inspection interval determination - Damage tolerance substantiation - Spectrum loading analysis - Mean stress correction methods - Multi-site damage assessment - Certification evidence generation ## Usage Guidelines - Use appropriate fatigue methodology based on structural criticality - Select material data from qualified sources (MMPDS, ESDU) - Apply appropriate scatter factors per regulatory requirements - Consider environmental effects on fatigue and crack growth - Define inspection intervals with adequate safety margins - Document all assumptions and conservatisms in certification reports ## Dependencies - NASGRO - AFGROW - Fe-Safe - nCode DesignLife ## Process Integration - AE-008: Fatigue and Damage Tolerance - AE-021: Certification Planning