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Volume 42 Issue 5
May  2016
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Journal of Beijing University of Aeronautics and Astronautics  > 2016  >  42(5): 899-905.
SUN Zhijia, YANG Xiying, LANG Lihuiet al. Test method of elliptical hydraulic bulging based on constant strain rate[J]. Journal of Beijing University of Aeronautics and Astronautics, 2016, 42(5): 899-905. doi: 10.13700/j.bh.1001-5965.2015.0653(in Chinese)
Citation: SUN Zhijia, YANG Xiying, LANG Lihuiet al. Test method of elliptical hydraulic bulging based on constant strain rate[J]. Journal of Beijing University of Aeronautics and Astronautics, 2016, 42(5): 899-905. doi: 10.13700/j.bh.1001-5965.2015.0653(in Chinese)
shu

Test method of elliptical hydraulic bulging based on constant strain rate

doi: 10.13700/j.bh.1001-5965.2015.0653
  • 1.

    Mechanical and Electrical Engineering Institute, Lanzhou University of Technology, Lanzhou 730050, China

  • 2. School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo 454000, China

  • 3. School of Mechanical Engineering and Automation, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

  • Received Date: 09 Oct 2015
  • Publish Date: 20 May 2016
    Abstract
  • To determine the forming limit curves (FLCs) of 2A16-O aluminum alloy sheet at various temperatures and strain rates, a modified Hollomon equation is put forward to acquire the fitted true stress-true strain curve. Through finite element analysis (FEA), the fracture position in elliptical hydraulic bulging with different ovality was obtained. The forming limit data in specified strain path were determined by optimizing the process parameters. The quantitative relation between pressure rate and strain rate was derived by establishing the formula of liquid pressure, equivalent strain and strain rate. By combining the uniaxial tensile with elliptical hydraulic bulging which is controlled by the constant strain rate, the FLCs of 2A16-O aluminum alloy sheet at different temperatures and strain rates were acquired. The above method provides the criterion for quantitatively analyzing the influence rule of strain rate on FLCs and evaluating which theoretical method is more accurate to predict FLCs.

     

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