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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2016, Vol. 37 ›› Issue (9): 2884-2894.doi: 10.7527/S1000-6893.2015.0289

• Material Engineering and Mechanical Manufacturing • Previous Articles    

Identification method of shear stress constitutive parameters of Ti-alloy thin-walled tube

YAN Jing1,2,3, WU Wei1,2,3   

  1. 1. Aeronautical Key Laboratory for Plastic Forming Technology, Beijing 100024, China;
    2. Beijing Key Laboratory of Digital Plastic Forming Technology and Equipment, Beijing 100024, China;
    3. Beijing Aeronautical Manufacturing Technology Research Institute, Beijing 100024, China
  • Received:2015-09-28 Revised:2015-10-20 Online:2016-09-15 Published:2015-11-25
  • Supported by:

    National Natural Science Foundation of China (51305415)

Abstract:

The identification of shear stress constitutive parameters (SSCPs) of Ti-alloy thin-walled tubes (TATTs) at different temperature levels (DTLs) is a key problem for the research of plastic deformation behavior in these tube shear bending processes under differential temperature fields constraints (DTFCs). A tube shear test method is presented. The TATTs isothermal shear test processes under the DTLs, the finite element (FE) models for simulating these test processes and the response surface models based on distance functions have been combined to present a reverse method for identifying these SSCPs of the TATTs under the DTLs. Then, this method is used for identifying the SSCPs of TA2 TATTs. A 3D coupled thermal-mechanical elastic-plastic FE model for simulating these shear bending processes under DTFCs of the TA2 TATTs is established. An experimental bending process is simulated by this FE model using the SSCPs and the uniaixal tension stress constitutive parameters (UTSCPs) respectively, and the reliability of this FE model is estimated. The results reveal that for SSCPs, the larger the temperature, the smaller the values of K and n; the value of m fluctuates;the effects of temperature on the SSCPs are larger than the UTSCPs and the values of the SSCPs are smaller. The computational precision level of the FE model using the SSCPs is larger than the UTSCPs by 60%.

Key words: Ti-alloy thin-walled tube, constitutive parameter, shear stress, parameter identification, finite element

CLC Number: