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Research Papers: Design and Analysis

Analysis of Heat Flow Around Bolted Joints and Variations of Axial Bolt Force

[+] Author and Article Information
Toshimichi Fukuoka

Graduate School of Maritime Sciences, Kobe University, Fukaeminami 5-1-1, Higashinada, Kobe, Hyogo 658-0022, Japanfukuoka@maritime.kobe-u.ac.jp

Masataka Nomura

Graduate School of Maritime Sciences, Kobe University, Fukaeminami 5-1-1, Higashinada, Kobe, Hyogo 658-0022, Japannomura@maritime.kobe-u.ac.jp

Keiichi Shino

Graduate School of Maritime Sciences, Kobe University, Fukaeminami 5-1-1, Higashinada, Kobe, Hyogo 658-0022, Japan

J. Pressure Vessel Technol 131(6), 061203 (Oct 08, 2009) (7 pages) doi:10.1115/1.4000198 History: Received July 02, 2008; Revised July 27, 2009; Published October 08, 2009

A bolted joint is widely used for the structures and machines subjected to thermal load, such as pressure vessels, internal combustion engines, brake disks, etc. In order to accurately evaluate the thermal stresses thus produced, the effect of thermal contact resistance at the interface and the heat flow through small gaps, which exist around the objective bolted joint, must be taken into account. In this paper, a numerical approach is proposed to solve the mechanical and thermal behaviors of bolted joints with high accuracy and computation efficiency, where empirical equations for thermal contact coefficient and apparent thermal contact coefficient are incorporated into commercial engineering software. By conducting systematic three-dimensional finite element analyses, it has been quantitatively elucidated how the supplied heat flows through each part of a bolted joint and how the axial bolt stress and bolt bending stress vary with time. It is concluded that bolted joints made of the materials with low thermal conductivity show specific heat flow patterns around the bolted joint and generate a large amount of variations in both axial bolt stress and bolt bending stress.

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Copyright © 2009 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Heat flow around pipe flange and brake disk

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Figure 2

Proportion of heat flow in each part of a bolted joint subjected to thermal load

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Figure 3

Three-dimensional FE model for standard condition

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Figure 4

Temperature and heat flux distributions for standard analytical condition

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Figure 5

Proportions of heat flow through each part of bolted joint

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Figure 6

Effects of grip length and block width on the proportion of heat flow

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Figure 7

Variations of axial bolt stress with time when subjected to thermal load

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Figure 8

Effects of grip length on the variations of axial bolt stress with time

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Figure 9

Variations of bolt bending stress with time when subjected to thermal load

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Figure 10

Test setup for measuring temperature and bolt stress variations with time

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Figure 11

Experimental results of block surface temperatures and bolt stresses compared with numerical ones

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