Abstract
Strength studies have been conducted on composite specimens of a glass and a glass-ceramic. The composite system consists of a glass fillet on the surface of a bar-shaped glass-ceramic. Controlled surface flaws have been introduced into the glass fillet via indentation. Strength has been studied as a function of indent load and the size of the glass fillet. The glass-glass-ceramic composite system is meant to represent a polycrystalline ceramic with duplex microstructure such that the glass fillet simulates a large single crystal. The glass-ceramic on the other hand simulates a fine-grained matrix. Thus, the present study simulates a strength versus grain size relation for a polycrystalline ceramic. The data indicate that in several coarse grained ceramics, an inherent crack arrests within the body after initial propagation prior to catastrophic failure. Microscopic examination coupled with an electric potential method indicated that the initial crack arrests at the glass-glass-ceramic interface. The data also suggests that differences in elastic constants across an interface may have a significant influence on strength.
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