Abstract
Deformation mode at the contact edge depends on stress ratio as well as other geometrical and mechanical parameters. In the present study, fretting fatigue tests with high stress ratios as well as FEM analysis were carried out to investigate the effect of stress ratio on crack initiation point. The crack initiation point become inside of the contact region at the high stress ratio, where the deformation mode at the edge is Gapping even under the minimum stress. The crack initiation point is found to be the maximum stress range point.
