Effects of fatigue damage and wear on fretting fatigue under partial slip condition

The continuum damage mechanics model incorporating wear was developed in the previous paper by the authors [27] to predict the fretting fatigue crack initiation life for both cases of partial slip and gross sliding. In the present study, the effects of external parameters on the fretting fatigue crack initiation behaviour under partial slip condition are investigated systematically. Firstly, a different fatigue damage accumulation rule is used, which can predict a more reasonable damage process. Secondly, the effects of the relative slip amplitude and wear coefficient are evaluated based on the improved approach. It is significant to note that the impact of wear coefficient on the fretting fatigue life is non-monotonic, and the action mechanism of that is analysed in detail in this work. Finally, the combination and competition between fatigue damage and wear are presented. The results indicate that none of the fatigue damage and wear can be neglected in the fretting fatigue life prediction.