Abstract
New crack length measurement methods using thin metal film were proposed in order to evaluate the crack growth characteristics during static fatigue process of ceramics. Also, the effect of crack length on the crack growth characteristics was investigated using both soda-lime glass and glass ceramics specimens. As the results, it was found that in the soda-lime glass, there is no difference between small- and long-crack growth characteristics. On the other hand, in the glass ceramics, it was found that sub-critical crack growth (SCG) resistance in small-crack propagation test is higher than that in long-crack propagation test. In addition, it is confirmed that the glass ceramics has higher SCG resistance than that in the soda-lime glass. Furthermore, it was confirmed that the proposed crack length measurement method is suitable for crack growth characteristics evaluation on ceramics.
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