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

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  • ボルト締結体まわりの熱流れと軸力変化の解析
  • ボルト テイケツタイ マワリ ノ ネツ ナガレ ト ジクリョク ヘンカ ノ カイセキ

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Abstract

A bolted joint is frequently used for the structures and machines subjected to thermal load, such as internal combustion engines, pressure vessels, 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 with high accuracy and computation efficiency is proposed, where empirical equation for thermal contact coefficient and apparent thermal contact coefficient are incorporated into commercial engineering software. By conducting systematic three-dimensional FE analyses, it is 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 axial bolt stress and bolt bending stress.

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