Stress analysis of composites with interfacial bridged cracks and damaged zones

Abstract

Stress analysis of composite structures with bridged cracks and damaged zones is performed with the direct boundary integral equations method in axisymmetric formulation. It is assumed that: a) the crack faces interact in some zones behind of the cracks edges (bridged zones); b) these zones width can be comparable to the whole crack size; c) adjacent parts of the structure can be connected by mechanical ligaments (including interfaces ahead of cracks fronts) and the relative displacements of these parts can occur under the loading (these zones consider as damaged zones). The boundary element software to solve axisymmetric problems of elasticity with interfacial bridged cracks and damaged zones was developed. The results for different properties of composite materials and bonds are presented. Applications the bridged crack approach to modeling of cracks self-healing is remarked.

Interface cracks bridged by nanofibers

“…Such models (in the terminology of [3], these are bridged crack models) have been studied for cracks in homogeneous materials as two-dimensional problems [4][5][6][7][8] and as axisymmetic problems [9][10][11]. For interface cracks, the bridged crack model have been extended and developed for two-dimensional case in [12,13] and for axisymmetic problems in [14].…”