Stress analysis of axisymmetric interface cracks with bridged and damaged zones

The direct boundary integral equations method in axisymmetric formulation is developed and implemented for stress analysis in structures with interface bridged cracks and damaged zones. For interface cracks modelling the multi-regions technique is used. It is assumed that: a) the crack faces interact in some zones behind of crack tips (bridged zones); b) these zones sizes can be comparable to the whole crack length; c) parts of the structure can be connected by mechanical ligaments (including interfaces ahead of cracks tips) and the relative displacements of these parts can occur under the loading (damaged or weak zones). The boundary element software to solve axisymmetric elasticity problems is developed. The results for different properties of composite materials and bonds are presented. Applications to modeling of cracks self-healing have been also considered.