3.3.1 Morphology of fretting region
During the fretting fatigue process of the material, the fretting wear
occurred on the contact surface between the specimen and the fretting
pad due to contact stress and cyclic stress. Under different contact
stresses, the fretting region showed different morphology. Fig.6
presents the morphology of the fretting region of 35CrMoA steel with
different contact stresses under DP and SP;