シェブロン切欠コンパクト試験片によるセラミックスの破壊靭性評価 : 最適形状決定と高温試験への適用

概要

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Fracture toughness tests conducted for hot-pressed silicon nitride, Si_3N_4, using chevron-notched compact specimens, with special attention paid to the fracture resistance curve (R-curve). Using the results at room temperature, optimum shape design was attemped for the simple fracture toughness test. Then, the validity of the specimens determined was confirmed at elevated temperatures (≦1160℃). The results obtained are summarized as follows. (1) The deeply chevron-notched specimen is judged to be the optimum shape from the view point of accuracy as well as of the simplicity of the test. (2) The resistance to stable crack growth is described as K_R=K_<IC>. (3) Within the temperature range tested, the fracture toughness, K_<IC>, and the fracture resistance, K_R, remain unchanged.
一般社団法人日本機械学会の論文
1988-05-25