Contact Model for a Rough Surface

Abstract

The paper presents a model for the determination of the contact characteristics, pressure distribution and subsurface stress field at the contact cylinder- plane. The first part of the paper presents the geometrical models used to determine the stress field. There are three models (at different scale) identified. In the second part there is performed an analysis with the first model, using a FEM cod and procedure in order to identify the stress filed. Then, for the second order profile and the second model of contact we present a model for determination of the asperity pressure distribution assuming the elastic-perfectly plastic deformation. The numerically generated rough surface is the base for the contact algorithm. The results show differences in comparison wit results predicted by Hertz theory. The maximum shear stress developed is significantly higher then predicted by theory