2023 Volume 59 Issue 3 Pages 65-72
The purpose of this study is to investigate the influence of sizing treatment of carbon fiber surface on apparent interfacial adhesive shear strength（ IFSS） between fiber and matrix under high strain rate condition. Model composite specimen with single fibers was prepared with carbon fiber as the reinforcement and thermoset epoxy resin as matrix, respectively. The observed IFSS was measured by fragmentation test. The dynamic tensile load was applied to the specimen by using an apparatus of tensile-type split Hopkinson pressure bar. Test results showed that the observed IFSS between sized carbon fiber and matrix was increased compared with that between un-sized carbon fiber and matrix when static tensile load was applied. As the applied strain rate was increased, the effect of the sizing treatment on the IFSS was not significant. The results also showed that the observed IFSS was decreased due to change of the distribution of fiber fragmentation length accompanying with the change of the morphology of carbon fiber breakage due to the generation of compressive elastic stress wave after breakage. It was also found that the influence of the generation of compressive elastic wave on the IFSS was more dominant than that of sizing treatment to determine the observed IFSS between carbon fiber and epoxy resin under high strain rate condition.
