Influence of surface roughness on friction during metal forming processes

The influence of roughness at contact surfaces is taken into account by means of a non-local friction law. Different 3D models of the rough surface on meso-level are considered and the influence of density of asperities distribution on the normal compliance law is shown. The effect of normal, as well as tangential tool velocity is investigated. It is shown that the tangential tool velocity has no influence on the normal compliance law. A method for determining the dependence of the Coulomb friction coefficient on surface roughness is proposed.