This study provides a theoretical and experimental investigation of the effect of the thread and bearing friction coefficients on the self-loosening of threaded fasteners that are subjected to cyclic transverse loads. The friction coefficients are varied by using different types of coating and lubrication. A phosphate and oil coating and an olefin and molydisulfide solid film lubricant are used on the bolts tested. A mathematical model is developed to evaluate the self-loosening behavior in threaded fasteners when subjected to cyclic transverse loads. An experimental procedure and test setup are proposed in order to collect real-time data on the loosening rate (rate of clamp load loss per cycle) as well as the rotational angle of the bolt head during its gradual loosening. The experimental values of the friction coefficients are used in the mathematical model to monitor their effect on the theoretical results for the loosening rate. Experimentally, the friction coefficients are modified by changing the coating or the lubrication applied to the fasteners. The theoretical and experimental results are presented and discussed.
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e-mail: nassar@oakland.edu
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August 2007
Technical Papers
Effect of Thread and Bearing Friction Coefficients on the Vibration-Induced Loosening of Threaded Fasteners
Basil A. Housari,
Basil A. Housari
Department of Mechanical Engineering, Fastening and Joining Research Institute,
Oakland University
, Rochester, MI 48309
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Sayed A. Nassar
Sayed A. Nassar
Department of Mechanical Engineering, Fastening and Joining Research Institute,
e-mail: nassar@oakland.edu
Oakland University
, Rochester, MI 48309
Search for other works by this author on:
Basil A. Housari
Department of Mechanical Engineering, Fastening and Joining Research Institute,
Oakland University
, Rochester, MI 48309
Sayed A. Nassar
Department of Mechanical Engineering, Fastening and Joining Research Institute,
Oakland University
, Rochester, MI 48309e-mail: nassar@oakland.edu
J. Vib. Acoust. Aug 2007, 129(4): 484-494 (11 pages)
Published Online: April 15, 2007
Article history
Received:
June 29, 2006
Revised:
April 15, 2007
Citation
Housari, B. A., and Nassar, S. A. (April 15, 2007). "Effect of Thread and Bearing Friction Coefficients on the Vibration-Induced Loosening of Threaded Fasteners." ASME. J. Vib. Acoust. August 2007; 129(4): 484–494. https://doi.org/10.1115/1.2748473
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