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Research Papers: Design and Analysis

A Proposed Model for Predicting Clamp Load Loss Due to Gasket Creep Relaxation in Bolted Joints

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

 BMW Manufacturing Co., Highway 101 South, Greer, SC 29651

Sayed A. Nassar

 Fastening and Joining Research Institute, Oakland University, Rochester, MI 48309

J. Pressure Vessel Technol 134(2), 021201 (Jan 11, 2012) (5 pages) doi:10.1115/1.4005387 History: Received April 06, 2010; Revised September 25, 2011; Accepted September 26, 2011; Published January 11, 2012; Online January 11, 2012

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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Copyright © 2012 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

Mechanical model of single-bolt gasketed joint [11]

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Figure 3

Behavior of the gasket viscoelastic element K2 ,C2

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Figure 10

Experimental and analytical clamp load results for 3/16 in. thick gasket

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Figure 9

Experimental and analytical clamp load results for 1/8 in. thick gasket

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Figure 8

Experimental and analytical clamp load results for 1/16 in. thick gasket

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Figure 7

A single-bolt gasketed joint test setup [11]

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Figure 6

Behavior of the gasket—compression with time

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Figure 5

Behavior of the gasket elastic element K1

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Figure 4

Behavior of the gasket viscous element C1

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