New approach to mathematical and finite element modeling of delaminationsin multidirectional multilayered laminated composite structures: I. Fracturecriteria and finite element algorithm,

摘要

Abstract: This paper presents new approach to the fracture analysis of laminated composite structures (laminates). The first part of the paper is devoted to the general algorithm, which allows to obtain critical stresses for any structure considering only the strip made from the same laminate. The algorithm is based on the computation of the energy release rates for all three crack modes and allows to obtain macro-failure parameters such as critical stresses through the micro-fracture characteristics. The developed algorithm is also based on the locality principle in mechanics of composite structures and sequential heterogenization method. The algorithm can be applied both for classical models of laminates with homogenous layers and new 3D finite element (FE) models of interfacial cracks in multidirectional composite structures. The results of multilevel, multimodel and multivariant analysis of 3D delamination problems with detailed microstructure in the crack tip zone are presented. !21