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Article Navigation >  Journal of Traffic and Transportation Engineering  > 2019  >  19(4): 94-103
LU Yao-hui, ZHANG De-wen, ZHAO Zhi-tang, LIU Jun-jie, LU Chuan. Influence of welding residual stress on fatigue strength for EMU aluminum alloy carbody[J]. Journal of Traffic and Transportation Engineering, 2019, 19(4): 94-103. doi: 10.19818/j.cnki.1671-1637.2019.04.009
Citation: LU Yao-hui, ZHANG De-wen, ZHAO Zhi-tang, LIU Jun-jie, LU Chuan. Influence of welding residual stress on fatigue strength for EMU aluminum alloy carbody[J]. Journal of Traffic and Transportation Engineering, 2019, 19(4): 94-103. doi: 10.19818/j.cnki.1671-1637.2019.04.009
shu

Influence of welding residual stress on fatigue strength for EMU aluminum alloy carbody

doi: 10.19818/j.cnki.1671-1637.2019.04.009
  • 1.

    Engineering Research Center of Advanced Driving Energy-Saving Technology of Ministry of Education, Southwest Jiaotong University, Chengdu 610031, Sichuan, China

  • 2.

    School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China

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  • Author Bio:

    LU Yao-hui(1973-), male, professor, PhD, yhlu2000@swjtu.edu.cn

  • Received Date: 2019-01-26
  • Publish Date: 2019-08-25
    Abstract
  • The residual stresses of butt joint for EMU aluminum alloy carbody were calculated by using the thermal-elastic plastic method and inherent strain method, and the values were compared to verify the rationality of calculating the residual stress by inherent strain method. The shell finite element model of carbody was established, and with reference to the criteria, Railway Applications—Structural Requirements of Railway Vehicle Bodies (EN 12663), the fatigue load conditions of carbody service state were determined. The fatigue strengthes of carbody with and without residual stress were calculated by applying the inertial release method. According to the principle of maximum principal stress, the multi-axial stress of carbody was transformed into the uniaxial stress, and the average stresses and stress amplitudes of concerned points of the welds and the base metal were obtained. Combining with the performance parameters of aluminum alloy carbody material, the Goodman fatigue curve was drawn. The reliability safety coefficients of each concerned point were calculated and the influence of residual stress on the carbody fatigue strength was analyzed. Analysis result shows that the welding residual stress has little effect on the concerned points of base metal, and its reliability safety coefficient decreases by less than 5%. The average stress increasing amount of the concerned point of weld can be up to 25 MPa, and its reliability safety coefficient decreases by more than 50%, up to 54%, which makes the carbody prone to fatigue failure. The residual stress has a significant change in the direction of the maximum principal stress of the concerned point of weld.

     

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