Abstract
1. Defects in glass ceramics of different systems have been studied by means of fluoroscopic flaw detection. It has been shown that according to the type of defects, glass ceramics may be divided into combined and homogeneous defect materials. An nlθ-criterion for glass ceramic defects has been developed. Linear fracture mechanics methods have been used to estimate strength levels for glass ceramics corresponding to grades of defects. 2. It has been shown that combined defect glass ceramics have three strength levels corresponding to processing and structural defects, and to interphase boundaries of the polycrystalline structure. A homogeneous defect glass ceramic has two strength levels governed by structural defects and by interphase boundaries. 3. The existence of calculated strength levels for glass ceramics has been demonstrated experimentally by determining strength, microstrength, and microbrittleness.
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