2020 Volume 46 Issue 3 Pages 81-84
Interfacial debonding on a fiber/resin interface is known as an initial failure followed by a transverse crack or delamination in composite materials. Thus, interfacial tensile strength is an essential material property for designing composites. Although several studies have been conducted on thermosetting resin-based composites, interfacial properties of thermoplastic resin composites have not been sufficiently studied. Furthermore, interfacial tensile strength between carbon fiber and matrix has also not been evaluated. In this study, the cruciform test method was used to experimentally evaluate the interfacial tensile strength in pitch-based carbon fiber/matrix. The process of interfacial debonding between pitch-based carbon fiber/epoxy resin was successfully observed, and an interfacial tensile strength of 41.3 [MPa] was obtained. The interfacial tensile strength of the composite with a polyamide 6 matrix was found to be 36.8 [MPa].
