Abstract
Abstract Crack tip bridging stresses in three alumina and three duplex ceramics are evaluated with a simple bridging theory, which utilizes the difference in compliance predicted for a crack of known size and that measured. The crack growth resistance (R-curve) behaviour of these ceramic materials is clearly elucidated by the bridging stresses evaluated. In addition, a consecutive cutting technique developed for cementitious materials is adopted to progressively remove the crack-wake bridging zone in two of these duplex ceramics. Variation in the unloading compliance and the crack growth resistance during consecutive cutting is observed, which provides further evidence of the predominant contribution of crack-wake bridging to the R-curve behaviour of these ceramic materials. The values obtained for the magnitude and range of the bridging stresses calculated using this approach are very similar to those recently calculated for alumina from direct scanning electron measurements of crack opening displacement of the crack tip.
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