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남기우,코토지안도 한국어업기술학회 1990 수산해양기술연구 Vol.26 No.4
The high stress, low cycle fatigue test were carried out on HT80 plates with artificial part-through notch. The LBB conditions by the net section stress approach was examined in detail. Finite element methods for the state of deformation were also applied and the results were compared with the results from experiments. From the test results, it was noted that the LBB condition in fatigue test was dependent upon the maximun load change before and after the crack penetration. The LBB criterion By the net section stress approach were slightly dependent on initial crack size. It was shown that the state of deformation can be used to predict whether the component is likely to show LBB condition or they will be broken rapidly.
Si<sub>3</sub>N<sub>4</sub>/SiC 복합 세라믹의 온도에 따른 크랙 힐링 관찰과 확산거동
송오성,안도 코토지,다카하시 코지,나가오 와타루,류지호,Song, Oh-Sung,Ando, Kotoji,Takahashi, Koji,Nakao, Wataru,Ryu, Ji-Ho 한국재료학회 2005 한국재료학회지 Vol.15 No.12
To investigate the microcrack healing behavior of $Si_3N_4-20wt\%SiC-8wt\%Y_2O_3$ composite ceramics(SNCY8), we observe the crack length evolution a! the time of 20, 40, 60 minutes with in-situ optical microscopy by varying healing temperature of $800\~1200^{\circ}C$. Crack healing obviously occurred as heating temperature and time increased. We proposed a simple model of effective diffusion based on the crack length evolution with healing condition, and determined the effective diffusion coefficient as Our result implies that we may predict the healing ability quantitatively with temperature and time in structural ceramics through the effective diffusion coefficient model.