An Elastic-Plastic Model for Two Contact Rough Surfaces

The individual asperity spherical platform volume is conserved and its shape is not distorted during plastic deformation. A plastic universal solution was derived based on spherical platform volume conservation when two asperities plastically contact. GW dry contact elastic model and the surface microgeometry model of purely plastic contact are two limiting cases of the plastic general solution. The plastic ordinary solution depends not only the total interference but also on the interference history-critical elastic interference, which is in accordance with Levy-Mises equation. GW dry contact model underestimates the contact area. The plasticity index was given here that distinguishes from that of GW dry contact elastic model.