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张文沛,胡志力,李欢欢,华林.车用铝合金板材回弹规律研究[J].稀有金属材料与工程(英文),2019,48(7):2130~2137.[Zhang Wenpei,Hu Zhili,Li Huanhuan and Hua Lin.Experimental and numerical investigation on springback of automotive aluminum alloy sheet[J].Rare Metal Materials and Engineering,2019,48(7):2130~2137.]
Experimental and numerical investigation on springback of automotive aluminum alloy sheet
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Received:February 02, 2018  Revised:April 10, 2018
Key words: aluminum alloy  springback  V-bending test  constitutive modeling
Foundation item:国家自然科学基金(Grant No.51775397,51405358);“111”计划(B17034);中国汽车产业创新发展联合基金(U1564202);教育部创新团队发展计划(IRT13087)
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Zhang Wenpei,Hu Zhili,Li Huanhuan and Hua Lin  
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      In the forming process of automotive aluminum alloy, springback is one of the main defects and difficult to be controlled. In this study, stress-strain curves of automotive aluminum alloy 6061 are obtained through tensile tests at room temperature and the constitutive model is established based on a modified Johnson-Cook equation. The model is used in finite element simulation of V-bending tests to investigate the effect of different anisotropic yield criterions on accuracy of springback prediction. Experimental and simulation results indicate that the prediction results are more accurate when YLD2000-2d yield criterion is applied and the efficacy of the model in sprignback analysis is verified. Furthermore, the effect of several different factors on springback behavior of aluminum alloy sheet was investigated, including deformation degree, drawing velocity, friction condition and blank holding force. The experimental and numerical investigation is applied in stamping forming process of aluminum alloy inner panel of engine cover and the springback is reduced effectively.