Evaluation of forming limit in viscous pressure forming of automotive aluminum alloy 6k21-T4 sheet

摘要：

A ductile fracture criterion is introduced into numerical simulation to predict viscous pressure forming limit of the automotive body aluminum alloy 6k21-T4.The material constant in the ductile fracture criterion is determined by the combination of the viscous pressure bulging (VPB) test with numerical simulation.VPB tests of the aluminum alloy sheet are carried out by using various elliptical dies with different ratios of major axis to minor axis(β),and the bugling processes are simulated by the aid of the finite element method software LS-DYNA3D.On the basis of the stress and strain calculated from numerical simulations,the forming limits of bulging specimens obtained are predicted by the ductile fracture criterion,and compared with experimental results.The fracture initiation site and the minimal thickness predicted by the ductile fracture criterion are in good agreement with the experimental results.

关键词： aluminum alloy sheet viscous pressure forming limit ductile fracture criteria finite element analysis

作者: WANG Zhong-jin LI Yi LIU Jian-guang ZHANG Yi-he

作者单位: School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China Research and Development Center,China FAW Group Corporation,Changchun 130011,China

会议类型: 国际会议

会议名称: 2007年国际有色金属大会(International Conference of Nonfereous Materials 2007)(ICNFM)

会议地点: 长沙

会议语种:英文

在线出版日期: 2007-11-28（万方平台首次上网日期，不代表论文的发表时间）