Interfacial Failure Criterion of a Glass Fiber/Epoxy Composite

摘要

In fiber reinforced composite materials, the interface between the fiber and the matrix plays a key role in mechanical properties of composite materials. Therefore, a more accurate evaluation method of the interface is necessary to develop better fiber reinforced composite materials. Many techniques are used for evaluating the interfacial properties. An interfacial strength evaluation method using cruciform specimens has a feature that it can avoid the influence of the stress singularity at the free edge. In the present study, the relation between the interfacial tensile stress and the interfacial shear stress is examined. A GF/Epoxy model composite is used. The initiation and propagation of interfacial debonding are experimentally clarified. Moreover, stress analysis using finite element method (FEM) is conducted.