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Research Papers

Formulation of Elastic Interaction Between Bolts During the Tightening of Flat-Face Gasketed Joints

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

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

Basil A. Housari

Joining Technology Engineering, DaimlerChrysler Corporation, 800 Chrysler Drive, Auburn Hills, MI 48326

J. Mech. Des 131(2), 021004 (Jan 06, 2009) (9 pages) doi:10.1115/1.3042149 History: Received March 01, 2007; Revised November 12, 2008; Published January 06, 2009

A novel mathematical model is proposed for studying elastic interaction in gasketed bolted joints. The model predicts the tension changes in tightened bolts due to the subsequent tightening of other bolts in the joint. It also predicts the final clamp load distribution after the completion of joint tightening. The model is used to investigate the effect of various factors on the elastic interaction phenomenon; factors include the gasket thickness, bolt spacing, fastener preload level, and tightening sequence of various bolts. Experimental verification is provided for the validation of the mathematical model. Experimental and analytical results are presented and discussed. The proposed model provides a good prediction of the final clamp load in the joint. Moreover, the proposed model may be used to determine the level of initial bolt tension in each bolt that would be necessary to achieve the desired level of uniform clamp load in the joint at the initial assembly.

Copyright © 2009 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Schematic of a multibolt flanged joint

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Figure 2

Upper flange free body diagram

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Figure 3

Flow chart of the MATLAB algorithm

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Figure 4

Sequential and star tightening patterns

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Figure 5

Analytical model prediction of elastic interaction (1/8-in.-thick gasket)

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Figure 6

Experimental elastic interaction data (1/8-in.-thick gasket)

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Figure 7

Analytical model prediction of elastic interaction (1/16-in.-thick gasket)

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Figure 8

Experimental elastic interaction data (1/16-in.-thick gasket)

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Figure 9

Analytical model prediction of elastic interaction (three-bolt joint)

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Figure 10

Analytical model prediction of elastic interaction (five-bolt joint)

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Figure 11

Analytical model prediction of elastic interaction (seven-bolt joint)

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Figure 12

Analytical model prediction of elastic interaction (3000 lb preload level)

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Figure 13

Analytical model prediction of elastic interaction (6000 lb preload level)

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Figure 14

Analytical model prediction of elastic interaction (9000 lb preload level)

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Figure 15

Model results of elastic interaction for sequential tightening pattern

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Figure 16

Flow chart for the model proposed for achieving a uniform joint clamp load

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Figure 17

Model prediction of a desired uniform clamp load

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Figure 18

Experimental verification of model prediction of a desired uniform clamp load

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