接合体の熱応力の解析

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  • Analysis of thermal stresses in ceramic-metal joint.
  • セツゴウタイ ノ ネツ オウリョク ノ カイセキ

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It is well known that large thermal stresses arise in a ceramic-metal joint because of thermal expansion mismatch. To avoid fracture of a joint, therefore, a ceramic with a smaller thermal expansion coefficient than metal has been recommended. The joint is called a "compressive joint, because it is believed that only compressive stresses arise in the ceramic part. A finite element calculation, however, has shown that a large tensile stress acts even in a ceramic part of a compressive joint. The aim of this study is to clarify stress distribution in a compressive joint by solving analytically the stress equation of the joint<BR>We have dealt with a special joint in which the elastic constants of the ceramic are assumed to be the same as those of the metal, for convenience. The calculated tensile stress agrees fairly well withthat obtained by the finite element method and also the stress distributions by both the methods are more or less the same.

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