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Effect of Non-Parallel Wedged Surface Contact on Loosening Performance of Preloaded Bolts Under Transverse Excitation

[+] Author Affiliations
Xianjie Yang, Sayed A. Nassar

Oakland University, Rochester, MI

Paper No. PVP2011-57694, pp. 405-415; 11 pages
  • ASME 2011 Pressure Vessels and Piping Conference
  • Volume 2: Computer Technology and Bolted Joints
  • Baltimore, Maryland, USA, July 17–21, 2011
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-4452-6
  • Copyright © 2011 by ASME


An analytical model is proposed for investigating the effect of non-parallel (wedge) contact on the loosening performance of a preloaded bolt-nut connection under transverse cyclic excitation along the wedge direction. From the model, if the wedge angle is sufficiently small, the self-loosening may take place. On the other hand, if the wedge angle is large enough, the self-loosening caused by the back off rotation may be prevented. Experimental and analytical results show that the proposed model accurately predicts both the self-loosening performance, and it also establishes the requirements for preventing the loosening of the preloaded bolt-nut system.

Copyright © 2011 by ASME
Topics: Rotation , Wedges



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