Abstract
The multilevel model of bridged cracks for analysis of the interfacial fracture toughness and cracks growth process is proposed and used. It is assumed: there are bonds of the different levels between jointed materials (the interface layer); a zone of weakened bonds in this layer is considered as an interfacial crack with distributed nonlinear spring-like bonds between the faces of a crack (the bridged zone); the size of the interface crack bridged zone is comparable to the whole crack size. The quantitative analysis of the bridging effect on interfacial toughness is performed accounting for the influence of the boundary conditions of structures.
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