Strength Evaluation of Alumina's Spray Coating : 5th Report, Consideration of the Strength in Sprayed Structure for Thermal Stress

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  • アルミナ溶射皮膜の強度評価 : 第5報,熱負荷に対する溶射構造体の強度検討
  • アルミナ ヨウシャ ヒマク ノ キョウド ヒョウカ ダイ5ホウ ネツフカ ニ タイスル ヨウシャ コウゾウタイ ノ キョウド ケントウ

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Abstract

In this study fracture probability at thermal stress distribution is calculated with the dangerous volume quantification method that was proposed in the former report. Fracture stress calculation by thermal stress is based on finite element method with fracture temperature and aluminum creep properties. The fracture strengths predicted with the proposed method are appropriate to experimental results obtained by heat tests. The calculated dangerous volume intended for 90% of product in alumina's spray coating on aluminum layer is part of 96% or more of maximum stress. Therefore the dangerous volume calculation in thermal stress distribution is enough to think experienced dangerous volume caluculation method that dangerous volume is volume of 90% or more of maximum stress. And it is shown that fracture origin is located in the dangerous volume calculated with this study method and fracture strengths predicted with fracture origin size is almost equal to the fracture strengths predicted with this study.

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