New Method for Prediction of High Cycle Fatigue Life

Randomly distributed models of micro-plastic strains were used to calculate the micro- plastic deformation produced at each cycle of the steel under high cycle fatigue test. The micro- plastic strains are determined by combining the true fracture ductility of the steel under test. For 40Cr steel, the errors of the fatigue life calculated with the proposed method are less than 30% compared with that determined by test.