単繊維純せん断試験に基づくCF/PC界面引張強度に関する実験的評価

抄録

The interfacial failure, debonding, is considered one of the initial cracks in laminate, and propagates on a larger scale of failure, such as transverse cracks and delamination. Therefore, interfacial tensile strength should be evaluated correctly as an important parameter for application in analytical studies. There are some researches focusing on the evaluation of fiber-reinforced thermosetting composites; however, to the best of our knowledge, there have been few reports on interfacial properties of thermoplastic composites. The aim of this study was to evaluate the interfacial tensile strength at the CF/PC interface by a novel measurement method. Single-fiber pure shear (SFPS) test was performed on single-fiber-embedded specimens. Debonding was observed and the interfacial tensile strength was calculated to be 36.5±2.21 MPa. Therefore, we concluded that the SFPS test would be the most reliable method because its standard deviation was much smaller than that of conventional methods like the cruciform test and the transverse test. However, more experimental research is needed to enhance data reliability.