Abstract
Post-deflection behaviour of a T-shaped deflected crack formed by the interaction between a primary crack and a defect in a bi-material interface has been investigated. It is predicted that behaviour of the deflected crack is significantly influenced by the globally applied loading and specimen geometry from the early stage of its growth and that it may kink out of the interface before any significant growth along the interface depending on the interfacial fracture energy. This implies that simply achieving crack deflection in early stage of loading is not sufficient and prevention of kinking of the deflected crack out of the interface during its growth is also practically important to obtain improved toughness. Hence it is suggested that post-deflection behaviour of the deflected crack must be considered in addition to the crack deflection criteria in determining the critical conditions for toughening of layered composite. Toughening criteria based on these results has been derived and compared with the existing experimental results.
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