Crack Growth Characteristics of Silicon nitride under Static and Cyclic Loading

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J. Korean Ceram. Soc. > Volume 33(10); 1996 > Article

Journal of the Korean Ceramic Society 1996;33(10): 1095.

질화규소의 정적 및 반복하중에 있어서 균열진전특성

유성근, 오츠카아끼오

나고야대학 재료기능공학과

Crack Growth Characteristics of Silicon nitride under Static and Cyclic Loading

ABSTRACT

Test restuls showed that under static loading crack growth rate decreases with increase of crack extension until the crack is arrested while under cyclic loading the crack growth with a constant velocity without being arrested even in the range of K values where no growth is observed under static loading. Crack length depen-dence of "K-V relationship" (K:stress intensity factor V: crack velocity) and crack velocity dependence of "K-$Delta$a relationship " ($Delta$a: crack extension) obtained from the crack growth data concerning the relation between crack velocity and crack extension under static loading and cyclic loadingg and cyclic loading

Key words: Silicon nitride, Static crack growth, Cyclic crack growth, R-curve, Crack growth fatigue