A New Contact Model of Sphere Asperity in the Fully Plastic Regime Considering Strain Hardening

Abstract

Understanding the contact characteristics of rough surfaces is essential to explain engineering phenomenon in interface. In order to improve accuracy of contact model, a novel simplified fully plastic contact model of sphere asperity was proposed considering material properties based on fractal theory. Firstly based on Von Mises yield criteria maximum contact pressure factor was derived. Secondly relationships taking into consideration strain hardening were proposed to describe contact area based on definition of the fully plastic contact area index and contact pressure. Then the critical interference at inception of fully plastic deformation was derived. Lastly validations were conducted for different materials. The results show that present work is remarkably consistent with experiment results and has higher accuracy than other models.