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Volume 46 Issue 5
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Journal of Beijing University of Aeronautics and Astronautics  > 2020  >  46(5): 893-899.
Kou Changhe, Cheng Xiaoquan, Li Zhengnenget al. Prediction of the Compressive Strength for Composite Honeycomb Core Sandwich Panels after Low Speed Impact[J]. Journal of Beijing University of Aeronautics and Astronautics, 1998, 24(5): 555-558. (in Chinese)
Citation: BI Jing, MA Bolin, ZHANG Yanling, et al. Hot forming limit of TA15 titanium alloy based on M-K model[J]. Journal of Beijing University of Aeronautics and Astronautics, 2020, 46(5): 893-899. doi: 10.13700/j.bh.1001-5965.2019.0358(in Chinese)
shu

Hot forming limit of TA15 titanium alloy based on M-K model

doi: 10.13700/j.bh.1001-5965.2019.0358
  • 1.

    AVIC Manufacturing Technology Institute, Beijing 100024, China

  • 2.

    Aeronautical Key Laboratory for Plastic Forming Technology, Beijing 100024, China

  • 3.

    School of Mechanical Engineering and Automation, Beihang University, Beijing 100083, China

  • 4.

    Beijing Key Laboratory of Digital Forming Technology and Equipment, Beijing 100024, China

Funds:

National Natural Science Foundation of China 51875027

China Postdoctoral Science Foundation 2018M630058

  • Received Date: 03 Jul 2019
  • Accepted Date: 20 Sep 2019
  • Publish Date: 20 May 2020
    Abstract

  • In order to investigate the forming limit of TA15 titanium alloy at high temperature and clarify the influence of parameters in the constitutive equation on the forming limit, the constitutive relationship of TA15 titanium alloy in high temperature environment was established considering the high temperature softening phenomenon, and meanwhile, the forming limit of TA15 titanium alloy plate at high temperature was obtained by high temperature forming limit test platform and theoretical predicted through applying the M-K instability theory, respectively. The theoretical results indicate that the major strain under the plane strain state increases from 0.18 to 0.33 when the temperature increases from 800℃ to 880℃. Based on the M-K instability theory and the established high temperature constitutive model, the influence of the parameters in the constitutive equation on the forming limit is analyzed. The results show that, increasing the values of hardening index and the rate sensitivity factor, and decreasing the value of the softening factor can increase the strain hardening rate, and consequently the strain state in the groove region is delayed approaching the plane strain state. Therefore the position of the forming limit curve in strain space is improved. At the same time, the theoretical calculation results show that the influence of the strain rate sensitivity factor on the left side of the forming limit curve is greater than that on the right side, and it is attributed to the fact that the effect of the strain rate sensitivity factor on the strain hardening rate under different strain size is different.

     

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