Abstract
An approach to crack deflection at interfaces or within interphases is proposed on the basis of the Cook and Gordon's mechanism 1 : a crack is nucleated along an interface, ahead of a propagating crack; deflection of thiscrack then results from coalescence with the interfacial crack. The stress state induced by a crack was computed in a cell of bimaterial using the finite element method. The cell represents a matrix and a fiber, or an interphase and a fiber or two layers in a multilayered matrix. A master curve was established. It is based on a debonding depending on strengths and elastic moduli of constituents. The master curve allows deflection of cracks to be predicted with respect to constituent properties. It was used to evaluate the strength of various fiber/matrix interfaces and interphases in ceramic matrix composites. It is discussed with respect to experimental data and crack observations.
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