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《Journal of South China University of Technology(Natural Science Edition)》 2008-02
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Modification Mechanism of Residual Stress on Milled Surface with Stretching Fixation

Xu Hong-hao Zuo Dun-wen Zhu Xiao-xiao Wang Min(College of Mechanical and Electrical Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,Jiangsu,China)  
In this paper,the thermoelastoplastic theory of plane strain was adopted to analyze the variations of stress and strain in the stretching-fixation milling process and to reveal the relationship between the initial strain and the residual stress.Then,a strain superposition model was proposed,which recognized the increase in residual compressive stress only when the stretching fixation produced positive initial strain.Moreover,the stretching-fixation milling of TC4 titanium alloy was performed at a milling speed of 38~566m/min and an initial strain of 0~0.003.Finally,the residual stresses on the machined surface were measured in the directions of 0,30,90 and 120 degrees from the stretching direction,respectively.Experimental results indicate that the variations of the residual stresses measured in the four directions are consistent with the initial elastic strains,thus demonstrating the correctness of the proposed strain superposition model.
【Fund】: 国家自然科学基金资助项目(50375072)
【CateGory Index】: TG54
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1 Zhao Lili\ Zhang Yidu(School of Mechanical Engineering and Automation, Beijing University of Aeronautics and Astronautics, Beijing 100083, China);Computer simulation of residual stress for cold rolling prestrectching board[J];Journal of Beijing University of Aeronautics and Astronautics;2004-07
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