Abstract
In order to study the characteristics of strength of ceramics, the constant loading rate test and the cyclic loading test were carried out in an ambient atmosphere, with a beam specimen and a ring specimen of ceramics. In the case of constant loading rate condition, the fracture stress was correlated with the equivalent crack length. The results showed that fracture for small inherent flaws occurred at lower stress than the predicted by the linear fracture mechanics concept. The tendency in the relation was explained by the modification that a material constant should be added to the original equivalent crack length. The distribution of fatigue life was investigated experimentally, and the S-N curves were predicted by using the crack growth equation under cyclic loading, and assuming that the distribution of flaw sizes of specimens under cyclic loading was equal to that of the specimens used in constant loading rate test.
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