Abstract
Analytical discussion for establishing an failure criterion on fiber/matrix interface by using cruciform specimen method is presented. By changing cruciform angle in which fiber embedded along, interfacial failures in various stress ratio of tensile and shear could be obtained experimentally. In order to establish the interfacial failure criterion in mixed mode, it is necessary to comprehend the relationship between experimental results and initiation location of the interfacial failure which is also dominated by the interfacial failure criterion itself. This relationship is complicated and is desired to be clarified analytically in advance of the experiments. In the present work, interfacial stress distributions are first analyzed by finite element method. And then the logic to obtain the interfacial failure criterion from the experiments is described.
