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An approach to predictions of failure in ceramics and of failure damage in Ceramic Matrix Composites (CMC) is discussed. For ceramics, particular emphasis was placed upon the populations of fracture inducing flaws. The flaw strength parameters, that are used to infer the failure of various loading geometries were estimated in view of fracture origins identified by scanning electron microscopy, using analytical as well as computerized methods. The proposed approach for CMC considers the microcomposite geometry. The Weibull model as well as a more fundamental model based upon the elemental strength concept were used.
failure probability, ceramics, ceramic matrix composites, Weibull distribution, multiaxial model, scale factors
Research Director, Laboratoire des Composites Thermostructuraux, UMR 47 CNRS-SEP-UB1, Domaine Universitaire, Pessac,