Finite Element Simulation of Conventional and Prestressed Cutting of Ti6Al4V
Titanium alloys are known as difficult-to-machine materials,chip morphology plays a predominant role in determining machinability and tool wear during the machining of titanium alloys.Based on the finite element analysis and experimental validation,the cutting processes in conventional cutting and prestressed cutting of titanium alloy ring parts were explored respectively.The Johnson-Cook model expressed by equivalent plastic strain flow stress is utilized to describe the constitutive properties.A ductile fracture criterion based on the strain energy is applied to model the crack initiation and evolution during the chip segmentation.Cutting force as well as distributions of stress,temperature and equivalent plastic strain along cutting time were numerically compared.The results indicate that in conventional cutting and prestressed cutting,chips show the similar characteristic of continuous and regular serrated shape.Initial stress distribution of workpiece was changed by prestress,which correspondingly leads to the alteration of stress distribution in the subsurface layer.Prestress hardly influences the distributions of temperature and equivalent plastic strain on workpiece.The cutting force curves share the same average amplitude and analogous undulating rhythm.
Prestressed Cutting Finite Element Simulation Titanium Alloy Cutting Force Chip Morphology
Ruitao Peng Xinzi Tang Yuanqiang Tan Xiongwei Liu
School of Mechanical Engineering,Xiangtan University,411105,Hunan Province,China School of Mechanical Engineering,Xiangtan University,411105,Hunan Province,China;School of Science a School of Science and Engineering,University of Cumbria,CA1 2HH,Cumbria,UK
国际会议
沈阳
英文
962-968
2013-07-06（万方平台首次上网日期，不代表论文的发表时间）