fatigue-analysis

# Fatigue Life Prediction Skill ## Purpose The Fatigue Life Prediction skill provides specialized capabilities for assessing fatigue life and durability under cyclic loading conditions, enabling systematic evaluation of component life using stress-life, strain-life, and fracture mechanics approaches. ## Capabilities - Stress-life (S-N) curve application and analysis - Strain-life (epsilon-N) methodology implementation - Fracture mechanics crack growth prediction (NASGRO, AFGROW) - Load spectrum development and cycle counting (rainflow) - Damage accumulation using Miner's rule - Mean stress correction methods (Goodman, Gerber, Soderberg) - Multiaxial fatigue assessment - Fatigue report generation with life predictions ## Usage Guidelines ### Fatigue Analysis Approaches #### Stress-Life Method (S-N) 1. **Application** - High-cycle fatigue (N > 10^4 cycles) - Elastic stress conditions - Rotating machinery, vibration loading 2. **S-N Curve Development** ``` S = A * N^b Where: S = stress amplitude N = cycles to failure A, b = material constants ``` 3. **Endurance Limit Modifiers** ``` Se = Se' * ka * kb * kc * kd * ke * kf Where: ka = surface factor kb = size factor kc = load factor kd = temperature factor ke = reliability factor kf = miscellaneous effects ``` #### Strain-Life Method (epsilon-N) 1. **Application** - Low-cycle fatigue (N < 10^4 cycles) - Plastic strain present - Notched components 2...