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Research Papers: Design and Analysis

Achieving Uniform Clamp Load in Gasketed Bolted Joints Using a Nonlinear Finite Element Model

[+] Author and Article Information
Sayed A. Nassar, Zhijun Wu, Xianjie Yang

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

J. Pressure Vessel Technol 132(3), 031205 (May 05, 2010) (10 pages) doi:10.1115/1.4001040 History: Received April 23, 2008; Revised December 14, 2009; Published May 05, 2010; Online May 05, 2010

A three-dimensional nonlinear finite element model is developed for achieving a uniform clamp load in gasketed bolted joints. The model is used for both multiple and single pass tightening patterns. Geometric nonlinearity of the gasket is taken into account and plastic model parameters are experimentally determined. The effect of the tightening pattern, gasket loading and unloading history, and the preload level is investigated. The validity of the FEA methodology is experimentally verified. This study helps improve the reliability of gasketed bolted joints by minimizing the bolt-to-bolt clamp load variation caused by elastic interaction among the various bolts in the joint during initial joint-bolt-up.

Copyright © 2010 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Stress-strain relationship of the flexible graphite gasket

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Figure 2

Finite element model and model geometry

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Figure 3

Illustration of bolt loading function in ABAQUS/STANDARD

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Figure 4

Sequential and star tightening patterns

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Figure 5

Experimental test setup

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Figure 6

The FEA and experimental bolt tension variation of sequential tightening pattern

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Figure 7

The FEA and experimental bolt tension variation of star tightening pattern

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Figure 8

Mean bolt tension versus tightening passes with sequential and star patterns

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Figure 9

1-σ tension scatter versus tightening passes with sequential and star patterns

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Figure 10

The FEA and experimental bolt tension variation of sequential tightening with loosened joint

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Figure 11

Mean bolt tension versus tightening passes with sequential pattern

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Figure 12

1-σ tension scatter versus tightening passes with sequential pattern

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Figure 13

Mean bolt tension versus tightening passes with star pattern

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Figure 14

1-σ tension scatter versus tightening passes with star pattern

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Figure 15

The FEA and experimental bolt tension variation of sequential tightening pattern

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Figure 16

The FEA and experimental bolt tension variation of star tightening pattern

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Figure 17

Mean bolt tension (percentage of preload) versus tightening passes with sequential pattern

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Figure 18

1-σ tension scatter (percentage of preload) versus tightening passes with sequential pattern

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Figure 19

Unloading procedure with single-pass star pattern

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Figure 20

Star single-pass tightening with a 5000 lb target preload

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Figure 21

Sequential single-pass tightening with a 5000 lb target preload

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