Three-dimensional molecular dynamics analysis of processing using a pin tool on the atomic scale

A three-dimensional model of molecular dynamics (MD) is proposed to study t he effects of tool geometry and processing resistance on the atomic-scale c utting mechanism. The model includes the utilization of the Morse potential function to simulate the interatomic force between the workpiece and a too l. The results show that the cutting resistance increases with the angle of the pin tool and the depth of cut, and the cutting force is essentially co nstant over the range of velocities simulated. In addition, the obtained cu tting resistance of present MD simulation exhibits an evident relationship to the ratio of the vertical and the horizontal contact area between the to ol and the workpiece within the range of a pin angle of 90-150 degrees. Fin ally, work hardening and stick-slip phenomena during the process are also o bserved.