転動荷重下での表面処理膜の破壊機構

転動荷重下での表面処理膜の強度評価法の研究(第2報)

抄録

In the previous report, to establish an evaluation method of a rolling contact fatigue strength for a coating film, an endurance limit of coated roll for contact loading was investigated and a crack initiation was found to determine the endurance strength dominantly. And we proposed that a mechanism of cracking was a fatigue process caused by a compressive tangential stress under contact loading.
So, in this study, static and fatigue properties of Cr-plating film under a bending, tension and compression were obtained. And these properties were compared with rolling contact fatigue strength of Cr-plating film on a fatigue endurance diagram. As a result, we found that the rolling contact fatigue strength agrees well with the value estimated from the static and fatigue properties. And the rolling contact fatigue strength of Cr-plating film would be estimated from the static and fatigue properties. Also, it was found that a residual stress of Cr-plating had a large effect on the rolling contact fatigue strength.