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J. Korean Ceram. Soc. > Volume 34(10); 1997 > Article
Journal of the Korean Ceramic Society 1997;34(10): 1053.
알루미나 세라믹스의 동적피로거동
이홍림, 이규형, 박성은
연세대학교, 세라믹공학과
Dynamic Fatigue Behavior of Alumina Ceramics
The dynamic fatigue behavior of alumina ceramics was observed at room temperature using four point bending system. The dynamic fatigue fracture strength and the dynamic fatigue lifetime were observed as a function of crosshead speed and the notch length. The notched specimen showed the smaller deviation in dynamic fatigue fracture strength than the unnotched specimen. The crack growth exponent n and the material constant A of the notched specimen could be represented as functions of the notch length. Fracture strength of the specimen calculated from the notch length, when the notch length was regarded as the crack size, was in good agreement with the measured 4 point bending strength. Fracture surface of the specimen showed the different fracture modes according to the crosshead speed. The four point flexural strength, fracture toughness, Young's modulus and Weibull modulus of the alumina were measured as 360 MPa, 3.91 MPa.m1/2, 159GPa, 17.64, respectively.
Key words: Dynamic fatigue, Crack growth exponent, Crosshead speed
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