Abstract
A micromechanical model is proposed to explain a phenomenon observed in interface cracking in metal/ceramic bimaterial systems; that a crack along the interface may propagate in some cases by the growth of interfacial voids or microcracks ahead of the main crack and coalescence with the main crack. The model shows the importance of the local loading phase angle in the crack tip response. Depending on the local crystallographic orientation of the deformable component of the bimaterial, the model predicts that a brittle backwards growth of the microcrack may occur while the main crack tip remains inert. The predictions are consistent with experimental observations.
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