The interfacial structure formed by silane coupling agents influences interfacial properties between the reinforcement and matrix in GFRP. However, the evaluation of interfacial structure at the molecule level has not obtained sufficient experimental results yet. Therefore, a numerical analysis method is expected to presume evaluation in molecule levels. In this study, we proposed forming a model of interfacial structure, and tried to evaluate the model with fractal dimensions that can classify complex figures. We proposed a model of interfacial structure for the finite-element method, and investigated the relationship between interfacial structure and the stress transmission mechanism. Moreover, we compared the results of numerical analysis with interfacial transmissibility in order to verify this analysis method. It was clear that the difference in interfacial structure influenced interfacial properties. The above result suggests that this analysis method is useful in investigation of the effects of interfacial structure on interfacial properties.
