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Residual stress measurement on propellant tank of 2219 aluminum alloy and study on its weak spot

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Abstract

This paper presented residual stress measurement on two circumferential Variable polarity plasma arc welding (VPPAW) joints and one circular closed Friction stir welding (FSW) joint on the propellant tank of 2219 aluminum alloy using the indentation strain-gauge method. Quite large tensile residual stresses were attached to the center and inner areas of the circular closed FSW joint. There were very large tensile stresses in some points of the two circumferential VPPAW joints, among these points, the maximum value was +253 MPa, which was about 63 % of the yield strength of 410 MPa measured in the base material. In addition, the peak of compressive residual stress was about -160 MPa. Above all, there were two typical peaks of residual stress in the circumferential VPPAW joints, one was located in the middle part while the other one was near the start/end position of the joints. Combining the result of residual stress measurement with the characteristics of the tank structure, it can be concluded that circular closed FSW joint around the flange was a weak spot on the propellant tank. And the most vulnerable point on the circular closed FSW joint has also been found.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Tianjin Key Laboratory of Advanced Joining Technology, Tianjin University, Tianjin, China

    Chaoqun Huang, Huan Li, Jianxiong Li & Chuanguang Luo

  2. Sichuan Institute of Aerospace Systems Engineering, Chengdu, Sichuan, China

    Chuanguang Luo

  3. School of Mechanical Engineering, Tianjin University, Tianjin, China

    Yanbing Ni

Authors
  1. Chaoqun Huang
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  2. Huan Li
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  3. Jianxiong Li
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  4. Chuanguang Luo
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  5. Yanbing Ni
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Corresponding author

Correspondence to Yanbing Ni.

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Recommended by Associate Editor Yang Zheng

Chaoqun Huang is a master of School of Materials Science and Engineering College, Tianjin University, Tianjin, China. He received his master degree in materials processing engineering from Tianjin University.

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Huang, C., Li, H., Li, J. et al. Residual stress measurement on propellant tank of 2219 aluminum alloy and study on its weak spot. J Mech Sci Technol 31, 2213–2220 (2017). https://doi.org/10.1007/s12206-017-0417-5

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  • DOI: https://doi.org/10.1007/s12206-017-0417-5

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