Figure 27.

At the edge of a contact under a transverse load (red in (A)) one often finds a sharp peak in transverse stress (B). If the local stress exceeds a certain critical stress, sliding sets in. This is referred to as partial slip [131]. Panel (C) sketches the force-displacement relation of a sphere-plate contact with partial slip as calculated with the Cattaneo-Mindlin model [132]. The differential contact stiffness is indicated as a dashed line. It decreases with increasing displacement.