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Fatigue performance on 7050 aluminum alloy by twice hole expansion strengthening of split mandrel

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Abstract

To investigate the impact of various forms of hole expansion strengthening of split mandrel (HESSM) process on the fatigue performance of 7050 aluminum alloy, a 3D finite element simulation analysis model is established for once hole expansion strengthening (OHES) and twice hole expansion strengthening. HESSM experiment is conducted to explore its influence on hole wall stress, microstructure, and fatigue life. The results show that the depth of the plastic deformation layer in the middle area of the hole wall is 1.69 times for specimens by twice hole expansion strengthening than that of OHES. Additionally, residual stress on the hole wall is higher and uniform for compared with OHES, when by twice hole expansion strengthening in opposite directions (THESOD) using split mandrel. The median fatigue life of the specimen by OHES is 1.52 times that of without expansion strengthening (WES). The median fatigue life of the specimen by twice hole expansion strengthening in the same direction using split mandrel is 1.73 times that of WES, and the median fatigue life of the specimen by THESOD using split mandrel is 1.80 times that of WES.

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Funding

This work was financially supported by the National Natural Science Foundation of China for Creative Research Groups (No. 51921003), the financial support for this work by the Innovation Fund of National Commercial Aircraft Manufacturing Engineering Technology Research Center (No. COMAC-SFGS-607), and the Jiangsu Scientific Research and Practice Innovation Program (No. KYCX21_0196).

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Authors and Affiliations

  1. College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China

    Fei Liu, Honghua Su, Jiuhua Xu & Yongnan Liang

Authors
  1. Fei Liu
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  2. Honghua Su
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  3. Jiuhua Xu
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  4. Yongnan Liang
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Contributions

Fei Liu: experimentation, data curation, and writing the original draft. Honghua Su: supervision, conceptualization, and methodology. Jiuhua Xu: supervision, and methodology. Yongnan Liang: experimentation.

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Correspondence to Honghua Su.

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Liu, F., Su, H., Xu, J. et al. Fatigue performance on 7050 aluminum alloy by twice hole expansion strengthening of split mandrel. Int J Adv Manuf Technol 129, 2241–2256 (2023). https://doi.org/10.1007/s00170-023-12416-8

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  • DOI: https://doi.org/10.1007/s00170-023-12416-8

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