An evaluation of mode-decomposed energy release rates for arbitrarily shaped delamination fronts using cohesive elements

摘要: Abstract Computing mode-decomposed energy release rates in arbitrarily shaped delaminations involving large fracture process zones has not been previously investigated. The J -integral is a suitable method for calculating this, because its domain-independence can be employed to reduce the integration domain cohesive interface , and it line integral. However, existing formulations evaluation of -integrals rely on assumption negligible zones. In this work, computation three-dimensional problems using zone model approach presented. formulation applicable curved fronts with non-planar crack faces. A growth driving direction criterion, which takes into account loading state at each point, used render paths decompose modes. This results crossing zone. Furthermore, implementation finite element framework also addressed. validated against virtual closure technique (VCCT) linear elastic mechanics (LEFM)-based analytical solutions significance generality are demonstrated propagation composite structure.