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Title: A study of chip formation in ductile-regime machining of 6H silicon carbide by molecular dynamics
Authors: Xiao, G
To, S 
Zhang, G
Keywords: Chip formation
Ductile regime machining
Molecular dynamics
Silicon carbide
Issue Date: 2015
Publisher: InterScience
Source: International journal of nanomanufacturing, 2015, v. 11, no. 1-2, p. 64-77 How to cite?
Journal: International journal of nanomanufacturing 
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.
ISSN: 1746-9392
DOI: 10.1504/IJNM.2015.070524
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