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Research Papers: Design and Analysis

A Proposed Model for Creep Relaxation of Soft Gaskets in Bolted Joints at Room Temperature

[+] Author and Article Information
Ali A. Alkelani, Basil A. Housari, Sayed A. Nassar

Fastening and Joining Research Institute, Department of Mechanical Engineering,  Oakland University, Rochester, MI 48309

J. Pressure Vessel Technol 130(1), 011211 (Jan 30, 2008) (6 pages) doi:10.1115/1.2826430 History: Received July 20, 2006; Revised March 01, 2007; Published January 30, 2008

A mathematical model is proposed for predicting the residual clamp load during creep and∕or relaxation in gasketed joints. An experimental procedure is developed to verify the proposed model for predicting the gasket relaxation under a constant compression, gasket creep under a constant stress, and gasket creep relaxation. To study gasket creep relaxation, a single-bolt joint is used. The bolt is tightened to a target preload and the clamp load decay due to gasket creep relaxation is observed over time under various preload levels. Experimental and analytical results are presented and discussed. The proposed model provides an accurate prediction of the residual clamp load as a function of time, gasket material, and geometric properties of the gasket. 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.

Copyright © 2008 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Mechanical model of a typical gasket (1,11)

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Figure 2

Gasket force compression (1)

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Figure 3

Gasket creep and relaxation test setup

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Figure 4

Typical creep curve

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Figure 5

Experimental and analytical creep results for 1∕16in. thick gasket

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Figure 6

Experimental and analytical creep results for 1∕8in. thick gasket

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Figure 7

Experimental and analytical creep results for 3∕16in. thick gasket

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Figure 8

Experimental and analytical relaxation results for 1∕16in. thick gasket

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Figure 9

Experimental and analytical relaxation results for 1∕8in. thick gasket

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Figure 10

Experimental and analytical relaxation results for 3∕16in. thick gasket

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Figure 11

Mechanical model of single-bolt gasketed joint

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Figure 12

A single-bolt gasketed joint test setup

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Figure 13

Experimental and analytical creep relaxation results for 1∕16in. thick gasket

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Figure 14

Experimental and analytical creep relaxation results for 1∕8in. thick gasket

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Figure 15

Experimental and analytical creep relaxation results for 3∕16in. thick gasket

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