Simulation-based evaluation of surface micro-cracks and fracture toughness in high-speed grinding of silicon carbide ceramics

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• 作者：Yao Liu ; Beizhi Li ; Chongjun Wu ; Yihao Zheng
• 关键词：Ceramic ; Micro ; crack ; Dynamic fracture toughness ; High ; speed ; Surface quality
• 刊名：The International Journal of Advanced Manufacturing Technology
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：86
• 期：1-4
• 页码：799-808
• 全文大小：2,638 KB
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• 作者单位：Yao Liu (1) (2)
  Beizhi Li (1)
  Chongjun Wu (1)
  Yihao Zheng (2)
  
  1. Department of Mechanical Engineering, Donghua University, Shanghai, 201600, China
  2. Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI, 48105, USA
  
• 刊物类别：Engineering
• 刊物主题：Industrial and Production Engineering
  Production and Logistics
  Mechanical Engineering
  Computer-Aided Engineering and Design
  
• 出版者：Springer London
• ISSN：1433-3015
• 卷排序：86

文摘

Surface/subsurface crack during grinding limits the application of engineering ceramics. High-speed grinding is proposed in ceramics grinding for high material removal rate and surface quality. The dynamic fracture toughness of ceramic materials is established by combining the Johnson-Holmquist 2 damage model for brittle material and the Griffith fracture theory. Single-grit simulation was utilized to investigate the individual crack generation and propagation in silicon carbide (SiC) indentation and engagement under different wheel surface speed. The indentation simulation results indicate that high-speed grinding enhances the SiC plastic deformation in the contact zone. Engagement simulation shows that the micro-crack transforms from deep and narrow longitudinal crack in the subsurface to shallow and width lateral crack on the surface when the wheel surface speed increases with a constant maximum undeformed chip thickness. To validate this model, the high-speed grinding experiments are conducted. The trends of micro-crack evolution, single grit force, and surface roughness of the experimental results at the constant workpiece feed rate match well with the simulation results. Keywords Ceramic Micro-crack Dynamic fracture toughness High-speed Surface quality