A study of chip formation in ductile-regime machining of 6H silicon carbide by molecular dynamics Online publication date: Thu, 09-Jul-2015
by Gaobo Xiao; Suet To; Guoqing Zhang
International Journal of Nanomanufacturing (IJNM), Vol. 11, No. 1/2, 2015
Abstract: Much effort have been devoted to the ductile regime machining of silicon carbide (SiC) in recent years. However, a thorough understanding on the mechanism of chip formation has not been achieved. In this study, large scale molecular dynamics simulations are performed to investigate the ductile-regime machining of 6H SiC. It is found that the mechanism of chip formation transforms from shearing to extrusion when the tool rake angle varies from 0° to −40°. The nature of plastic deformation is slipping processes on the basal slip system of 6H SiC and shearing along several inclined planes. Under a rake angle of −40°, a 'pseudo edge' is observed in front of the cutting edge throughout the cutting process. Under a rake angle of −20', a periodic process of formation and vanishing of 'pseudo edge' is observed. The formation of 'pseudo edge' leads to a decrease in the principle cutting force, and its vanishing is followed by increase of principle cutting force.
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