In this paper, a simple method of predicting the critical deformation of composite materials with interfacial cracks was carried out under mode of II conditions using singularity strength Ki, and the fracture criteria of the interface between concrete and cementitious mortar bonded with ceramic tile finishing are evaluated. singularity strength Ki are considered by two types of stress intensity factors K1 and K2 on the basis of the interfacial fracture mechanics. The stress distribution and singularity at the interface between dissimilar materials are obtained by two-dimensional elastostatic boundary element analyses under a plane strain state. singularity strength Ki determine the mixed mode fracture criteria of the interfaces. Prediction of the first delamination and its development by these factors are compared with the empirical results of compressive tests on composite model specimens containing several types of tile finishing. It was confirmed that critical deformation could generally be predicted by the simple method.
