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Study of prestress ultrasonic peening on bending curvature and surface properties of stiffened plates

  • Tao ZhangEmail author
  • Huapu Sha
  • Shihong Lu
  • Lei Li
  • Zhiye Wang
Technical Paper
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Abstract

Stiffened plates are commonly adopted as key structure components in aerospace due to light weight structure with high strength and stiffness. Ultrasonic peening (UP) is the key process for manufacturing of wing panels with stiffened plates; however, large bending strain is difficult to be generated during free UP, which significantly affects its surface properties. Prestress UP is adopted through applying prebending moment to stiffened plates before peening process and its effects on bending curvature, surface hardness and roughness, residual stress distribution under different peening parameters are analyzed. The results show that larger chordwise bending strain can be obtained in prestress UP and it increases with decreasing prebending curvature radius and decreasing offset distance as well as increasing firing pinvelocity. Compared to free UP, smaller surface roughness, larger surface hardness, larger and deeper compressive residual stress can be acquired in prestress UP and their differences between two UP ways increase with decreasing prebending curvature radius. Meanwhile, increasing firing pin velocity and decreasing offset distance are beneficial to hardening extent of peening and generation of large and deep compressive residual stress. However, large firing pin velocity results in large surface roughness and appropriate value of firing pin velocity should be used. Small offset distance will decrease the peening efficiency; therefore, comprehensive consideration of large bending deformation and peening efficiency should be considered. Prestress UP is effective to increase bending strain and improve surface properties of stiffened plate and this study can provide guidance for parameters selection.

Keywords

Prestress UP Prebending moment Bending curvature Surface hardness and roughness Residual stress 

Notes

Acknowledgements

This work was supported by National Natural Science Foundation of China (Grant No. 51705248); Natural Science Foundation of Jiangsu Province, China (Grant No. BK20170785); Open Research Fund of State Key Laboratory for High Performance Complex Manufacturing, Central South University (Kfkt2017-08).

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Copyright information

© The Brazilian Society of Mechanical Sciences and Engineering 2019

Authors and Affiliations

  • Tao Zhang
    • 1
    Email author
  • Huapu Sha
    • 1
  • Shihong Lu
    • 1
  • Lei Li
    • 1
  • Zhiye Wang
    • 1
  1. 1.College of Mechanical and Electrical EngineeringNanjing University of Aeronautics and AstronauticsNanjingChina

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