Assessment of Strength-Probability-Time Relationships in Ceramics

Abstract
In the past few years a number of test procedures have evolved as a result of attempts to observe stable crack growth in ceramics under constant stress conditions. These procedures are briefly reviewed. The available slow crack growth data which has been presented in the literature is used to estimate survival times for various stress levels. The computations are completed in several ways: (a) use of strength data obtained at various loading rates; (b) deterministic integration of the equations; and (c) in a Monte Carlo sense, wherein the controlling parameters are assumed to possess realistic variability. The end product of each set of computations is a design stress-survival time relationship and the purpose of this paper is to compare these life estimates and comment on the adequacy of each method.

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