A new method for estimating fatigue life of notched specimen

摘要

Highlights?A new method for fatigue life prediction of notch components is proposed.?The stress distributions of notch root are analyzed by finite element method.?The fatigue life of notch specimen is estimated by the proposed method.AbstractFatigue life of engineering structure contains two parts: crack initiation life and crack propagation life. Fracture mechanics is adopted to estimate crack propagation life in the real engineering structures and has made some achievements. Actually, the existing study indicated that fatigue crack initiation is also an important period in the whole fatigue life. So, a new method to predict the whole fatigue life of notch components is proposed based on the theory of damage mechanics in this paper. The damage evolution equation of notch specimen under tension compression loading is obtained based on closed-form solution. The stress distributions of notch root are analyzed by finite element method. The whole fatigue life of notch specimen is estimated by the proposed method when