Molecular Dynamics Analysis of Sliding Friction and Wear Mechanisms: Behaviors of Zero-Wear Transition Regions

摘要

Various molecular dynamics simulations have been performed in order to clarify friction and wear mechanism in their transition region at an atomic level. The specimen and the slider are assumed to consist of monocrystalline copper and rigid diamond, respectively, and the Morse potential is postulated between a pair of atoms. The atomic behaviors in a plane corresponding to the (111) plane of the copper are simulated dealing with a plane strain problem. In the simulations, the influence of the indentation depth on friction-and-wear phenomena was investigated. As a result, the friction-and-wear process of copper by the hard particle were classified into four regions as follows: (1) friction process by atomic-scale stick-slip phenomenon, (2) friction process with elastic deformation, (3) wear process with ploughing due to removal of atoms, and (4) wear process with ploughing due to plastic deformation. Each feature was clarified.