An improved mathematical model is proposed for predicting clamp load loss due gasket creep relaxation in bolted joints, taking into consideration gasket behavior, bolt stiffness, and joint stiffness. The gasket creep relaxation behavior is represented by a number of parameters which has been obtained experimentally in a previous work. An experimental procedure is developed to verify the proposed model using a single-bolt joint. The bolt is tightened to a target preload and the clamp load loss due to gasket creep relaxation is observed over time under various preload levels. The experimental and analytical results are presented and discussed. The proposed model provides a prediction of the residual clamp load as a function of time, gasket material and thickness, bolt stiffness, and joint stiffness. The improved model can be used to simulate the behavior of creep relaxation in soft joints as the joint stiffness effect is considered. Additionally, a closed form solution is formulated to determine the initial clamp load level necessary to provide the desired level of a steady state residual clamp load in the joint, by taking the gasket creep relaxation into account.
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April 2012
Research Papers
A Proposed Model for Predicting Clamp Load Loss Due to Gasket Creep Relaxation in Bolted Joints
Basil A. Housari,
Basil A. Housari
BMW Manufacturing Co.
, Highway 101 South, Greer, SC 29651
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Ali A. Alkelani,
Ali A. Alkelani
BMW Manufacturing Co.
, Highway 101 South, Greer, SC 29651
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Sayed A. Nassar
Sayed A. Nassar
Fellow ASME
Fastening and Joining Research Institute, Oakland University
, Rochester, MI 48309
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Basil A. Housari
BMW Manufacturing Co.
, Highway 101 South, Greer, SC 29651
Ali A. Alkelani
BMW Manufacturing Co.
, Highway 101 South, Greer, SC 29651
Sayed A. Nassar
Fellow ASME
Fastening and Joining Research Institute, Oakland University
, Rochester, MI 48309J. Pressure Vessel Technol. Apr 2012, 134(2): 021201 (5 pages)
Published Online: January 11, 2012
Article history
Received:
April 6, 2010
Revised:
September 25, 2011
Accepted:
September 26, 2011
Online:
January 11, 2012
Published:
January 11, 2012
Citation
Housari, B. A., Alkelani, A. A., and Nassar, S. A. (January 11, 2012). "A Proposed Model for Predicting Clamp Load Loss Due to Gasket Creep Relaxation in Bolted Joints." ASME. J. Pressure Vessel Technol. April 2012; 134(2): 021201. https://doi.org/10.1115/1.4005387
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