20104 アルミナセラミックスにおける熱衝撃破壊機構のディスクオンロッド試験による評価(衝撃,OS10 先進材料の力学と強度)

概要

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Crack growth behavior from a precrack in Alumina under thermal shock was evaluated by Disc-on-Rod test. In the Disc-on-Rod test used in the present study, the central region of heated disc specimen was quenched by means of contacting with a cool copper rod. During test, the temperature distribution on the specimen was measured by infrared camera. Simultaneously, AE signals during crack growth were detected by an AE sensor attached on the opposite end of the rod and the crack growth behavior was observed by a video camera system. Then, thermal stress and critical energy release rate for different precrack length were calculated by 3-D FEM analysis using temperature distribution. Relationship between the stability of crack growth and precrack length was discussed. Consequently, the crack growth behavior under thermal shock was characterized.
2005-03-17