Abstract
The influence of contact materials on the fretting fatigue strength of 3.5Ni-Cr-Mo-V rotor steel was examined using various contact materials : the same rotor steel, carbon and austenitic stainless steels, and nonferrous alloys of Cu, Al and Ti. Fretting fatigue strength was strongly influenced by the hardness and the elastic modulus of the contact material. The contact opening phenomenon in the neighborhood of the contact edge was clarified by means of contact elastic-plastic FEM analysis. Contact pressure and tangential stress on the fretted surface were analyzed in detail. Maximum tangential stress appeared within 0.01-0.5mm of the contact edge due to the contact opening phenomenon. Fretting fatigue limits for various contact materials were successfully estimated using the tangential stresses obtained by FEM analysis and the unfretted fatigue data of the smooth specimen.
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