アルミナ溶射皮膜の強度評価 : 第3報,き裂干渉を考慮した破壊強度安全設計法の提案(<小特集>電子機器の熱・機械信頼性と機械工学)

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  • Strength Evaluation of Alumina's Spray Coating : 3rd Report, Proposal for the Safety Design of Fracture Strength with Consideration of Cracks Interference(<Special Issue>Thermal and Mechanical Reliability of Electronic Device and Mechanical Engineering)
  • アルミナ溶射皮膜の強度評価(第3報)き裂干渉を考慮した破裂強度安全設計法の提案
  • アルミナ ヨウシャ ヒマク ノ キョウド ヒョウカ ダイ3ポウ キレツ カンショウ オ コウリョ シタ ハレツ キョウド アンゼン セッケイホウ ノ テイアン

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There are some reports to analyze by using the elastic analysis for two or more cracks. Moreover, there are some standards about union condition of the cracks. However in ceramics including alumina, the study of quantifying an internal spread of the crack when interfering and presuming static fracture strength with judgment of the crack interference after the stable crack propagation is hardly known. In this report, in order to predict fracture strength, crack shape just before brittle fracture in alumina's spray coating single layer is predicted with methods proposed in former report. And statistics method with consideration of fracture toughness scattering is used. In order to predict the crack shape before brittle fracture, image processing software is developed, therefore efficient data processing become possible. Moreover, the proposed fracture strength presumption is done in the standpoint of the safe design and has aimed to presume accuracy good on the safety side. The fracture strengths predicted with the proposed method are almost equal to experimental results obtained by 4-point bending tests. Then flowchart of fracture strength safety design using the proposed method is proposed.

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