INFLUENCE OF INDENT GEOMETRY ON REPEATED 2-DIMENSIONAL ROLLING-CONTACT

A ''two-body,'' elasto-plastic finite element model is employed to sim ulate repeated rolling contact in the presence of a surface irregulari ty. It is shown that the maximum Mises stress and equivalent plastic s train values in the substrate are related to the height of the pressur e spikes. The results of the finite element calculations are used to d erive generalizations about the influence of the indent geometry on th e pressure spikes, peak cyclic plastic strains and their location belo w the surface. These relations can serve as guidelines for designing t he depth and properties of surface coatings and modified layers.