The microslip phenomenon takes place in both rolling and sliding contacts. In the latter case it occurs in fretting, when the main cause of failure is surface degradation. Both cases are experimentally investigated in order to visualise microslip initiation. The position of the first obtained microslip marks is in good agreement with positions of maximum Huber-Mises-Hencky stress. These results associate the micro-slip initiation with contact stress field and proves the ability of Huber-Mises-Hencky stress to assess the occurrence of failure at the interface of an elastic contact in sliding or rolling motion.

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