| Evaluation of forming limit in viscous pressure forming of automotive aluminum alloy 6k21-T4 sheet |
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| 作者姓名： | 王忠金 李毅 刘建光 张义和 |
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| 作者单位： | [1]. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China [2]Research and Development Center, China FAW Group Corporation, Changchun 13001 1, China |
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| 摘 要： | A ductile fracture criterion is introduced into numerical simulation to predict viscous pressure forming limit of the automotive body aluminum alloy 6k2 l-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.
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| 关 键 词： | 铝合金薄片 延展断裂 有限远元分析 机械性质 |
| 收稿时间： | 15 July 2007 |
| 修稿时间： | 2007-07-15 |
Evaluation of forming limit in viscous pressure forming of automotive aluminum alloy 6k21-T4 sheet |
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| Zhong-jin WANG, Yi LI, Jian-guang LIU,Yi-he ZHANG.Evaluation of forming limit in viscous pressure forming of automotive aluminum alloy 6k21-T4 sheet[J].Transactions of Nonferrous Metals Society of China,2007,17(6):1169-1174. |
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| Authors: | Zhong-jin WANG Yi LI Jian-guang LIU Yi-he ZHANG |
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| Affiliation: | 1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China 2. Research and Development Center, China FAW Group Corporation, Changchun 130011, China |
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| Abstract: | 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. |
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| Keywords: | aluminum alloy sheet viscous pressure forming limit ductile fracture criteria finite element analysis |
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