Finite Element Analysis of the Thermal and Mechanical Behaviors of a Bolted Joint

[+] Author and Article Information
Toshimichi Fukuoka

Faculty of Maritime Sciences, Kobe University, 5-1-1, Fukaeminami, Higashinada-ku, Kobe, Japanfukuoka@maritime.kobe-u.ac.jp

J. Pressure Vessel Technol 127(4), 402-407 (Jun 21, 2005) (6 pages) doi:10.1115/1.2042477 History: Received December 19, 2003; Revised June 21, 2005

Mechanical and thermal behaviors of the bolted joint subjected to thermal load are analyzed using axisymmetric FEM, where the effects of thermal contact resistance at the interface and heat flow through small gap are taken into account in order to accurately evaluate the variations of bolt preloads. It is expected that the numerical procedure proposed here provides an effective means for estimating the strength of such critical structures as pressure vessels, internal combustion engines, steam and gas turbines, etc. An experimental equation that can compute the thermal contact coefficient at the interface composed of common engineering materials has been proposed in the previous paper. In this study, a simple equation for evaluating the amount of heat flow through small gap is shown by defining apparent thermal contact coefficient. Accordingly, a numerical approach has been established, which can accurately analyze the thermal and mechanical behaviors of a bolted joint, by incorporating the two kinds of thermal contact coefficients into FE formulation. By use of the FE code thus developed, it is shown that only a slight difference in coefficients of linear expansion among the joint members significantly affects the variations of bolt preloads. The validity of the numerical approach is demonstrated by experimentation.

Copyright © 2005 by American Society of Mechanical Engineers
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Figure 1

Heat flow through a bolted joint subjected to thermal load

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Figure 2

Test setup for measuring apparent thermal contact coefficient

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Figure 3

Relationship between apparent thermal contact coefficient and gap size

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Figure 4

Finite element model of a bolted joint subjected to thermal load (M16)

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Figure 5

Comparison of temperature distribution patterns

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Figure 6

Variations of bolt stress with time for common engineering materials

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Figure 7

Effects of coefficient of linear expansion on the bolt stress variations

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Figure 8

Effects of surface roughness of the mating surfaces on the bolt stress variations

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Figure 9

Effects of heat source intensity on the bolt stress variations

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Figure 10

Variations of the temperatures of selected points of bolted joint with time

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Figure 11

Effects of initial bolt stress on the bolt stress variations with time



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