The role of elastic property mismatch in the failure of ceramic composites
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Numerical analysis was undertaken to simulate a modification of the normalized stress-intensity factor applicable when the crack tip is in the vicinity of an interface separating materials of differing elastic properties. It is predicted that when the initial crack is subcritically extended to the interface, the strength of the sample is greater than if the failure occurred from the initial crack, without arrest at the interface. The fracture behaviour of microcracking on a polished WC/Si3N4 sample was examined. Crack branching, deviation and arrest were observed to depend on the instantly released energy.
KeywordsPolymer Elastic Property Material Processing Fracture Behaviour Initial Crack
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