Effect of Contact Pressure on Fretting Fatigue Strength

Abstract

the effects of contact pressure between the pad and specimen and the pad contact length on fretting fatigue strength were examined using NiCrMoV generator rotor steel and carbon steel pads. The fatigue limits at a low contact pressure decreased steeply with increasing contact pressure. At pressures higher than 100 MPa, the fatigue limits chenged slightly with increasing pressure. The fretting fatigue strengths depended on the pad contact length. The effects described above were successfully explained by fictitious crack concepts and a stress intensity factor taking account of the applied stress, contact pressure and frictional force.