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Volume 44 Issue 10
Oct.  2018
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Journal of Beijing University of Aeronautics and Astronautics  > 2018  >  44(10): 2035-2042.
CAI Gaoshen, WU Chuanyu, LANG Lihui, et al. Effect of flow stress calculation on formability of aluminum alloy warm sheet hydroforming[J]. Journal of Beijing University of Aeronautics and Astronautics, 2018, 44(10): 2035-2042. doi: 10.13700/j.bh.1001-5965.2018.0025(in Chinese)
Citation: CAI Gaoshen, WU Chuanyu, LANG Lihui, et al. Effect of flow stress calculation on formability of aluminum alloy warm sheet hydroforming[J]. Journal of Beijing University of Aeronautics and Astronautics, 2018, 44(10): 2035-2042. doi: 10.13700/j.bh.1001-5965.2018.0025(in Chinese)
shu

Effect of flow stress calculation on formability of aluminum alloy warm sheet hydroforming

doi: 10.13700/j.bh.1001-5965.2018.0025
  • 1.

    Faculty of Mechanical Engineering & Automation, Zhejiang Sci-Tech University, Hangzhou 310018, China

  • 2.

    Ningbo XingJian Space Machinery Co., Ltd., Ningbo 315153

  • 3.

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

Funds:

Natural Science Foundation of Zhejiang Province of China LQ18E050010

Scientific Research Foundation of Zhejiang Sci-Tech University 17022073-Y

More Information
  • Corresponding author: CAI Gaoshen, E-mail:caigaocan@126.com
  • Received Date: 12 Jan 2018
  • Accepted Date: 08 Apr 2018
  • Publish Date: 20 Oct 2018
    Abstract

  • In order to research the influence of flow stress calculation on formability of aluminum alloy warm sheet hydroforming, warm sheet bulging test was carried out to obtain bulging height-pressure curves with different bulging diameters in this study. Based on the data of bulging parts profile measured by three coordinate measuring machine, the least square circle fit (LSCF) radius were fitted, and it was found that when the height-diameter ratio h/a was in the range of 0.18 < h/a ≤ 0.68, the corresponding value of roundness error between the radius of curvature and the circle radius was 5%. By comparing the existing theoretical models for radius of curvature and thickness, which is combined with flow stress calculation, it was found that the average value of radius of curvature model Hill and Panknin, and the thickness model Kruglov-Hill are in the most accordance with experimental data. The combination model was used to calculate the bulging height-pressure curves obtained by bulging test, and then the stress-strain curves with different temperatures and pressure rates were obtained. It was found that there was a little impact on radius of curvature for different directions (rolling direction and vertical direction) of the bulging parts formed with 7075-O aluminum alloy at 210℃, while the pressure rate can affect the stress-strain curves.

     

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