A nonlinear mathematical model is developed for studying the self-loosening behavior of preloaded countersunk threaded fasteners that are subjected to cyclic transverse loads. Torque components acting on the bolt are divided into pitch and resistance torque components; the net torque determines whether or not the bolt will rotate loose under the external excitation. The accumulation of the differential amount of loosening rotation increments is converted into the gradual loss of the bolt tension/clamp load. Although the loosening model incorporates several system variables, this study is focused on investigating the effect of thread and bearing friction coefficients on the loosening of fasteners with coarse and fine threads. Model prediction of the self-loosening behavior is experimentally validated.
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July 2010
Research Papers
Effect of Thread and Bearing Friction Coefficients on the Self-Loosening of Preloaded Countersunk-Head Bolts Under Periodic Transverse Excitation
Amro M. Zaki,
Amro M. Zaki
Department of Mechanical Engineering, Fastening and Joining Research Institute,
Oakland University
, Rochester, MI 48309
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Sayed A. Nassar,
Sayed A. Nassar
Fellow ASME
Department of Mechanical Engineering, Fastening and Joining Research Institute,
Oakland University
, Rochester, MI 48309
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Xianjie Yang
Xianjie Yang
Department of Mechanical Engineering, Fastening and Joining Research Institute,
Oakland University
, Rochester, MI 48309
Search for other works by this author on:
Amro M. Zaki
Department of Mechanical Engineering, Fastening and Joining Research Institute,
Oakland University
, Rochester, MI 48309
Sayed A. Nassar
Fellow ASME
Department of Mechanical Engineering, Fastening and Joining Research Institute,
Oakland University
, Rochester, MI 48309
Xianjie Yang
Department of Mechanical Engineering, Fastening and Joining Research Institute,
Oakland University
, Rochester, MI 48309J. Tribol. Jul 2010, 132(3): 031601 (11 pages)
Published Online: June 4, 2010
Article history
Received:
November 3, 2009
Revised:
April 16, 2010
Online:
June 4, 2010
Published:
June 4, 2010
Citation
Zaki, A. M., Nassar, S. A., and Yang, X. (June 4, 2010). "Effect of Thread and Bearing Friction Coefficients on the Self-Loosening of Preloaded Countersunk-Head Bolts Under Periodic Transverse Excitation." ASME. J. Tribol. July 2010; 132(3): 031601. https://doi.org/10.1115/1.4001621
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