PROBABILITY OF FATIGUE FAILURE BASED ON RESIDUAL STRENGTH

The paper shows that, if the initial strength of a material follows the Weibull probability distribution, then the residual strength, after a given number of cycles, also follows this distribution. Furthermore, in each stage of the fatigue process, the shape parameter of the distribution remains unchanged, while the location and scale parameters decrease with the number of cycles applied. Test results for specimens of a steel alloy clearly indicate that the one-component distribution of the initial strength develops into a two-component distribution of the residual strength after fatigue cycling. The component with high residual strength corresponds to the crack initiation stage and that with low residual strength to the crack propagation stage.

PROBABILITY OF FATIGUE FAILURE BASED ON RESIDUAL STRENGTH Academic Article