A mathematical model and an experimental procedure are presented to study the self-loosening phenomenon of threaded fasteners that are subjected to cyclic transverse loads. The study investigates the effect of thread pitch, initial bolt tension, and the amplitude of the external excitation on the loosening of a single-bolt joint. The rate of drop in the joint clamp load (fastener tension) per cycle, as well as the total number of cycles that would cause the complete loss of clamp load, are monitored. In the mathematical model, the differential equations of linear and angular motion of the bolt are formulated in terms of the system properties and the external cyclic transverse excitation. Numerical integration of the equation of angular motion provides the bolt rotation in the loosening direction, which causes the partial or full loss of the clamp load. An iterative MATLAB code is developed and used for the calculation of tension loss in the fastener tension due to the self-loosening. Analytical and experimental results are discussed.
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November 2006
Research Papers
Effect of Thread Pitch and Initial Tension on the Self-Loosening of Threaded Fasteners
Sayed A. Nassar,
Sayed A. Nassar
Fastening and Joining Research Institute, Department of Mechanical Engineering,
Oakland University
, Rochester, MI 48309
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Basil A. Housari
Basil A. Housari
Fastening and Joining Research Institute, Department of Mechanical Engineering,
Oakland University
, Rochester, MI 48309
Search for other works by this author on:
Sayed A. Nassar
Fastening and Joining Research Institute, Department of Mechanical Engineering,
Oakland University
, Rochester, MI 48309
Basil A. Housari
Fastening and Joining Research Institute, Department of Mechanical Engineering,
Oakland University
, Rochester, MI 48309J. Pressure Vessel Technol. Nov 2006, 128(4): 590-598 (9 pages)
Published Online: July 30, 2005
Article history
Received:
June 27, 2005
Revised:
July 30, 2005
Citation
Nassar, S. A., and Housari, B. A. (July 30, 2005). "Effect of Thread Pitch and Initial Tension on the Self-Loosening of Threaded Fasteners." ASME. J. Pressure Vessel Technol. November 2006; 128(4): 590–598. https://doi.org/10.1115/1.2349572
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