抄録
In order to study the effect of the interaction and coalescence of multiple surface cracks by slit type surface crack on static fatigue behavior of brittle materials such as glass and ceramics, the various slit length were introduced on the surfaces of plate specimens of glass ceramics by scriber. Where, glass ceramic material with crystal grain size of about 0.05μm was used. It was found that the time-to-failure for a given applied stress significantly decreased with a increase in the distance of the slit length. Furthermore, the fatigue crack propagation was examined by ultrasonic testing. As the result, the ultrasonic velocity of transversal wave decreased with the progress of loading time.
