Abstract
Deflection of a main crack along an artificially formed weak plane consisting of a group of preexisting cracks in a sillicon nitride ceramic, was studied experimentally. The weak planes inside the ceramics were formed by diffusion joining of the ceramics. Main cracks were produced by indentation. Deflection of a main crack was related to the strength of a joining interface. A weak joining interface could cause deflection of a main crack, and strengthen a specimen with an initial main crack. A main crack passed across a strong interface and caused catastrophic failure.
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