抄録
Crack growth behavior from precrack in AlN under thrmal shock was evaluated by the Disk-on-Rod test. In this test, the heated specimen was quenched by means of contacting with a cool metal rod. The temperature distribution in the specimen was measured by IR camera, and AE signals during crack growth were detected by an AE sensor attached on the metal rod. In the present study, video camera system was applied to observe the crack growth behavior. Then, thermal stress and stress intensity factor were calculated by FEM analysis using temperature distribution. Deflection angles showed good agreement with the angles determined from two types of the mixed made fracture criteria. Consequently, the crack growth behavior under thermal shock was characterized.
