Abstract
Glass/epoxy interfacial tensile strength is investigated by the cruciform specimen method. A cruciform specimen which has large width only around fiber embedded in transverse direction can potentially prevent the stress singularity problem. The cruciform specimen geometry is first discussed by means of finite element analysis considering experimental conditions. Transverse tensile test is conducted and interfacial debonding which initiates at the middle of specimen not at edge is observed using the cruciform specimens. The interfacial tensile strength can be obtained by the value of stress concentration factor at interface times specimen stress. The location at which the debonding initiates is discussed and the validity of the evaluation method in this study is verified on an assumption that interfacial tensile strength is as high as or lower than interfacial shear strength.v
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