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Volume 41 Issue 4
Apr.  2015
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Journal of Beijing University of Aeronautics and Astronautics  > 2015  >  41(4): 675-679.
YANG Xiying, LANG Lihui, LIU Kangning, et al. Prediction of forming limit diagram of AA7075-O aluminum alloy sheet based on modified M-K model[J]. Journal of Beijing University of Aeronautics and Astronautics, 2015, 41(4): 675-679. doi: 10.13700/j.bh.1001-5965.2014.0310(in Chinese)
Citation: YANG Xiying, LANG Lihui, LIU Kangning, et al. Prediction of forming limit diagram of AA7075-O aluminum alloy sheet based on modified M-K model[J]. Journal of Beijing University of Aeronautics and Astronautics, 2015, 41(4): 675-679. doi: 10.13700/j.bh.1001-5965.2014.0310(in Chinese)
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Prediction of forming limit diagram of AA7075-O aluminum alloy sheet based on modified M-K model

doi: 10.13700/j.bh.1001-5965.2014.0310

  • School of Mechanical Engineering and Automation, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

  • Received Date: 29 May 2014
  • Rev Recd Date: 25 Jul 2014
  • Publish Date: 20 Apr 2015
    Abstract
  • To accurately predict the forming limit diagram of AA7075-O aluminum alloy sheet, a modified M-K model was put forward based on the ductile fracture criterion and the traditional M-K model. By using the method which combined the uniaxial tension simulation with experiment, the history of stress-strain of the dangerous element was substituted into the C-L ductile fracture criterion which was implemented into Abaqus/Explicit to get the material constant. Based on the forming limit data obtained by the uniaxial tensile, the initial thickness imperfection in the modified M-K model was obtained by the method which was programed in MATLAB. At room temperature, the experimental forming limit data of AA7075-O aluminum alloy sheet were tested through the uniaxial tensile, wide plate bending and hydraulic bulging experiments. Meanwhile, the theoretical forming limit curves obtained by the modified M-K model and the traditional M-K model were computed respectively. By comparison, the modified M-K model is proved to be feasible and more accurate.

     

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