Molecular Dynamics Simulation of Copper Processing Using AFM Pin Tool

Molecular dynamics(MD)simulation was employed to study the nanometric processing of single crystal copper by an AFM pin tool.In our approach,the two-body Morse potential and the many-body EAM potential were used for the atoms interaction in the copper workpiece to study the effect of different potentials on the simulation results.It is found that there is no obvious difference in the chip formation and the machined surface.But the Morse potential results in bigger system potential energy and higher temperature of the Newtonian atoms.EAM potential was carried out to simulate the atoms interaction in the single crystal copper workpiece.The diversifications of system potential energy and workpiece single atom potential energy at different cutting depths were both analyzed.It is showed that when the cutting depth increases,the slope of system potential energy variation increases,the jump's grads of workpiece's single atom potential decreases.