The amount of clamp load loss due to a fully reversed cyclic service load is determined for a bolted assembly in which the fastener and the joint were both tightened initially beyond their respective proportional limits. The cyclic reversed load acts in a direction parallel to the bolt axis. During the first half of each cycle, the cyclic load acts as tensile separating force that increases the fastener tension further into the nonlinear range; it simultaneously reduces the joint clamping force. Thus, after the first one half of the cycle, the clamp load is reduced from its initial value due to the plastic elongation of the fastener. During the second half cycle, the cyclic load compresses the joint further into the plastic range; simultaneously, it reduces the fastener tension. Due to the permanent set in the compressed joint, the clamp load is decreased further at the end of the second half cycle of the service load. The cumulative clamp load loss due to the permanent set in both the fastener and the joint is analytically determined using a nonlinear model. Variables investigated in this study include the joint-to-fastener stiffness ratio, the ratio of the initial fastener tension to its elastic limit, and the ratio of the external force to its maximum tensile value that would trigger joint separation.
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e-mail: nassar@oakland.edu
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April 2007
Research Papers
Cumulative Clamp Load Loss Due to a Fully Reversed Cyclic Service Load Acting on an Initially Yielded Bolted Joint System
Sayed A. Nassar,
Sayed A. Nassar
Fastening and Joining Research Institute, Department of Mechanical Engineering,
e-mail: nassar@oakland.edu
Oakland University
, Rochester, MI 48309
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Payam H. Matin
Payam H. Matin
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 48309e-mail: nassar@oakland.edu
Payam H. Matin
Fastening and Joining Research Institute, Department of Mechanical Engineering,
Oakland University
, Rochester, MI 48309J. Mech. Des. Apr 2007, 129(4): 421-433 (13 pages)
Published Online: April 8, 2006
Article history
Received:
November 11, 2005
Revised:
April 8, 2006
Citation
Nassar, S. A., and Matin, P. H. (April 8, 2006). "Cumulative Clamp Load Loss Due to a Fully Reversed Cyclic Service Load Acting on an Initially Yielded Bolted Joint System." ASME. J. Mech. Des. April 2007; 129(4): 421–433. https://doi.org/10.1115/1.2429700
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