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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    No. 6    December 2007

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Evaluation of forming limit in viscous pressure forming of automotive aluminum alloy 6k21-T4 sheet
WANG Zhong-jin(王忠金)1, LI Yi(李 毅)1,LIU Jian-guang(刘建光)1, ZHANG Yi-he(张义和)2

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

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.

 

Key words: aluminum alloy sheet; viscous pressure forming limit; ductile fracture criteria; finite element analysis

ISSN 1672-7029
CN 43-1423/U

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