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This paper first reviews the microstructural dependence of fracture energy (γ) for the typical fracture mechanics techniques used for ceramics. Next both agreement and substantial disagreement between the different techniques, for example, as a function of grain size, porosity, and second phase contents, are discussed in terms of microstructural-test interactions, such as effects of microcracking. Then strength and other related mechanical behavior are compared with predictions from γ measurements, showing important disagreements which are related to the same factors effecting γ tests, that is, microstructural-crack size factors.
fracture toughness, fracture energy, ceramics, ceramic composites, grain size, porosity, composition, specimen size, crack size, microcracking, crack branching, strength, composite materials, crack propagation
Head, Ceramics Branch, Naval Research Laboratory, Washington, D.C.,