The effects of thermal contraction mismatch on the toughening of glass by a dispersed phase were measured in a model system. Three toughening mechanisms were observed: prestressing of the dispersed phase, deflection of the crack by the stress field of the particle, and crack bowing between particles; deflection provided the greatest toughening. Toughening was increased by increasing particle size, decreasing particle spacing along the crack front, and increased particle spacing along the crack path.
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Nadeau et al. (1980) studied this question.
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