Evaluation of Thermal Contact Resistance at the Interface Composed of Dissimilar Materials

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  • 異材界面における接触熱抵抗の評価
  • イザイ カイメン ニ オケル セッショク ネツ テイコウ ノ ヒョウカ

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Abstract

When jointed portions of structures and machines are subjected to thermal loads, various problems and troubles occur due to the difference in thermal expansion between mating parts. In order to accurately analyze thermal and mechanical behaviors of the joints, the effect of thermal contact resistance must be taken into account. In this paper, thermal contact coefficient, which is the reciprocal of thermal contact resistance, at the interface composed of dissimilar materials is quantitatively measured by infrared thermography. The target materials are common engineering materials such as carbon steel, stainless steel and aluminum alloy. It has been shown that there exits a significant direction effect in thermal contact coefficients when the mating surface is composed of different materials. That is, the magnitude of the coefficient gives larger value when the heat flows from the material with lower thermal conductivity to the one with higher thermal conductivity. Also, the effects of contact pressure and surface roughness are evaluated. An empirical equation to estimate thermal contact coefficient is proposed, which can approximate the experimental values with sufficient accuracy from the engineering point of view.

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