Abstract
In this paper, a new method to predict the critical deformation of composite materials with interface cracks under mixed mode conditions by stress intensity factors K_1 and K_2 is presented, and also fracture criterions of the interfaces between concrete and cementitious wet-finishings are evaluated. Two kinds of stress intensity factors are based on interfacial fracture mechanics. Stress distribution and singularity on the interface between dissimilar materials are obtained by two-dimensional boundary element elastostatic analyses under a plane strain state. Two kinds of stress intensity factors determine the mixed mode fracture criterions of the interfaces. Predictions about delamination initiation and extension by these factors are compared with the results of observations made by compressive tests on composite model specimens that consist of several kinds of finishings. It was clarified that critical deformation could generally be predicted by the presented method.
