On Deterministic Elastoplastic Contact for Rough Surfaces

A deterministic contact model of rough surfaces was established, which contained the elastoplastic deformation of the asperities. Some important parameters, e.g. real contact area, local pressure and plastic deformation, were calculated. Contact area variations with the normal load in different elliptical parameters were presented. Junction growth and its variations with the sliding friction coefficient under different normal loads were also investigated. It is obvious that the real contact area was nonlinearly related with the normal load at high normal load. A larger elliptical parameter resulted in a smaller real contact area. Thus, the smaller elliptical parameter was preferred given to the lower mean contact pressure. The rate of junction growth increased as the sliding friction coefficient increased. The maximum von Mises stress increased and its location moved upward to the surface when considering interfacial shear. Under the heavy-load condition, a smaller raceway groove curvature radius coefficient resulted in the reduction of frictional work.