Abstract
The fretting fatigue of metal injection molded stainless steel (MIM 316L) with a mean pore diameter of 3 μm and porosity of 5.1% was investigated both experimentally and numerically. The granular-like wear debris accumulated in pores on the fretted surface of the MIM 316L specimen was the cause of the reduction in the tangential force coefficient, potentially improving fretting fatigue strength. These pores did not significantly influence the location of fretting crack nucleation and crack path due to high stress concentration at the fretting contact edge. Under the large-scale yielding at the crack tip and fretting-contact-induced crack opening/closure, a continuum body finite element model can be applied to estimate crack nucleation and propagation behavior, as well as fretting fatigue life.
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