A New Approach to the Prediction of Fretting Fatigue Life by Considering Shift of Contact Edge

Abstract

In fretting fatigue, it has been known that the contact edge is shifted inward because of wear. The effect of the contact edge shift on crack propagation behavior is considered here to predict accurate fretting fatigue life. The stress intensity factor (K_I) for fretting fatigue crack was calculated by using the contact pressure and frictional stress distributions. They were analyzed by finite element method. The S-N curves of fretting fatigue were predicted by using the relationship between the calculated stress intensity factor range (ΔK_I) and the crack propagation rate (da/dN) obtained from CT specimens. Fretting fatigue tests were performed on Ni-Mo-V steel specimens. The S-N curves of experimental results were in good agreement with the analytical results obtained by considering the contact edge shift.