Simulating multibody dynamics with rough contact surfaces and run-in wear

The overall dynamics of a multibody system is actually a multi-scale problem because it depends a great deal on the local contact properties.(coefficient of restitution, friction, roughness, etc); In this paper we found that the briefly presented force-based theory of plane dynamics for a multibody system with unilateral contacts was appropriate for simulating detailed multi-contact situations of rough contacting, surfaces. The focus of the paper is on a geometrically detailed description of rough surfaces. To achieve the run-in effect of the contacting surfaces under dynamical loads the contacting surfaces need to be re-shaped. For the re-shaping a wear model based on the local loss of mechanical energy under dynamical loads is presented. The new ideas are presented for a numerical analysis of measuring the coefficient of friction at the rim of a wheel (rotating body). With the help of the analysis the experimentally observed change in the measured coefficient. of friction of up to 30% for only slightly altered experimental conditions is explained.