Materials fatigue is the progressive, localized structural damage that occurs when a material is subjected to cyclic loading. Unlike static failure, fatigue can cause catastrophic fracture at stress levels far below the material's yield strength — accounting for an estimated 90% of all metallic structural failures in service. Understanding fatigue mechanics has been critical since the railway axle failures of the 19th century.
These simulations let you construct S-N curves, predict crack growth rates using Paris' law, apply Miner's cumulative damage rule, analyze stress concentrations around geometric discontinuities, and evaluate safe operating regions with Goodman diagrams — essential tools for any structural or mechanical engineer.