Abstract
In this paper, the phenomenon of roller scratch in Elastohydrodynamic lubrication(EHL) state is simulated successfully. A complete thermal EHL solutions of finite roller with scratch are obtained. Comparasions between current numerical film contours and Cameron’s optical interferometry graph shows satisfactory agreement. The characteristics of pressure, filmthickness as well as temperature distributions are discovered numerically. It could be concluded that surface scratch will generate a pressure increase, a high temperature and a thin film distributions on both outsides of the scratch, as well as a pressure drop, a low temperature and a thicker film distributions at the inside location of the scratch. Therefore, it will produce a local sharp maximum stress concentration and may possiblly lead to lubrication failure, which will accelerate the process of surface fatigue.
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