非等二軸熱応力状態下におけるアルミナセラミックスの熱衝撃き裂発生挙動の動的評価

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  • Dynamic Characterization of Crack Initiation Behavior in Alumina Ceramics under Unbalanced Biaxial Thermal Stress State

抄録

<p>Crack initiation and growth behavior in alumina ceramics under unbalanced thermal stress state was characterized by Disc-on-Rod (DoR) test. The thermal stress distribution was calculated using the finite element analysis from the temperature distribution recorded by an infrared camera. Using elliptical specimens, thermal stress ratio was well controlled by optimizing shapes of specimens and cooling rods. Furthermore, microfracture process was monitored by acoustic emission (AE) technique during thermal shock fracture. It was found that the maincrack was formed at the rapid increase in AE cumulative energy. It was also demonstrated that the maincrack was formed at the maximum stress point, on the direction perpendicular to the first principal stress. Finally, indispensable experimental technique for understanding thermal shock fracture in ceramic structures was well developed.</p>

収録刊行物

  • 年次大会

    年次大会 2020 (0), J04304-, 2020

    一般社団法人 日本機械学会

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