A study of chip formation in ductile-regime machining of 6H silicon carbide by molecular dynamics

Gaobo Xiao, Suet To, Guoqing Zhang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

5 Citations (Scopus)

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.
Original languageEnglish
Pages (from-to)64-77
Number of pages14
JournalInternational Journal of Nanomanufacturing
Volume11
Issue number1-2
DOIs
Publication statusPublished - 1 Jan 2015

Keywords

  • Chip formation
  • Ductile regime machining
  • Molecular dynamics
  • Nanomanufacturing
  • Silicon carbide

ASJC Scopus subject areas

  • Industrial and Manufacturing Engineering

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