Abstract
Fretting fatigue process have many features such as early stage crack initiation at contact edge, very slow crack propagation and fatigue failure after very long life operation. In previous paper we present fretting fatigue model which was considering the wear process, and this model can explain these fretting fatigue features reasonably. But, the estimation of fretting wear process require a large amount of labor, so this precise wear estimation method is not suitable for actual design site. In this paper we try to present simple fretting fatigue limit estimation method considering wear. In the final stage of wear process the stress distributions near contact edges converge to a nominal contact pressures. So, we estimate the ultra high cycle fretting fatigue limit as the crack propagation threshold on this uniform contact pressure conditions. This crack propagation threshold is analyzed using fracture mechanics analysis. Finally these estimated results are of ultra high cycle fretting fatigue limit compared with the experimental results, and can confirmed the availability of this simple fretting fatigue limit estimation method.
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