The framework for characterizing and predicting failure when simple crack propagation control predominates is reasonably well understood. Since, in many ceramic systems, crack propagation appears to be the primary failure mode much of this paper is devoted to a description of the crack propagation process. Other failure modes, such as crack initiation and complex crack propagation control, are, unfortunately, in a rather rudimentary state of development; however, some discussion of situations where these might occur is presented.
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