抄録
Focusing on the singular stress field near the contact edge, the evaluation of the fretting fatigue strength can be intrinsically carried out. Two kinds of singular stress field near the contact edge are possible to appear; one corresponds to the slipping deformation of the edge, and the other corresponds to the sticking deformation. The fretting fatigue tests with these two singular stress fields were designed and carried out. From cross-section of observation of the specimens at stress levels lower than the fatigue limit, fretting fatigue cracks were observed when the cyclic stress was above a certain level. This fact means that the specimen may be fractured at stresses lower than fatigue limit in the very high cycle regime. Therefore, the crack initiation limit, which corresponds to infinite fatigue life, is valuable to be investigated. Through the numerical analysis of the stress intensity coefficient of the singular stress fields, such limit corresponding to different singular stress field were quantitatively evaluated.
