Simulation Of Dynamic Variations Of Surface Topography In The Friction Process

Surface topography is the micro-geometry morphology remained at the surface of machine elements, which consists of roughness, waveness and form errors and caused by various random factors during machining. Description of the dynamic variations of surface topography in the friction progress is the basis for the research of tribological effects of surface topography. In this paper, according to the characteristics of brittle material and plastic material, the interaction mechanism of the surface topographys in the friction process is studied based on the principle of discrete element method. The Particle Flow Code program (or PFC program) is employed to simulate the interaction process of contacting surface topographys and digital descriptions of dynamic variations of the surface are given. Simulation results show that the roughness of surface become smaller after the interaction between rigid smooth surface and the ideal rough surface, and the surface structure changes. With the increase of normal approaching of the two contacting surfaces, the number of detached particles from the rough surface increases, indicating that the degree of wear between contacting surfaces increases.