Prediction and Evaluation of Fatigue Strength via Mechanical Behavior of Materials

Besides stress, the fatigue failure of part is also affected by the fatigue strength of materials. Therefore, it is necessary to predict the fatigue strength of materials before analyzing fatigue life. Considering the factors with uncertainty that affect the fatigue strength, the modified factors of fatigue are determined, and the stochastic fatigue strength is predicted. Among them, the distribution type and parameters of roughness factor are analyzed by improving Bootstrap method, which provides a method to analyze small samples. Moreover, the S-N curve cluster that characterizes the fatigue property is obtained, which provides a basis for fatigue life prediction.