Experimental Evaluation of Pitch-Based Carbon Fiber/Resin Interface Tensile Strength using Cruciform Test Method

Abstract

Interfacialdebonding onafiber/resininterfaceisknownasaninitialfailurefollowedby a transversecrack or delamination in compositematerials.Thus,interfacial tensilestrength isan essentialmaterialpropertyfordesigning composites.Althoughseveralstudieshavebeenconducted on thermosetting resin-based composites, interfacial properties of thermoplastic resin composites havenot been sufficientlystudied.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 ofthecompositewith a polyamide6matrix was found to be36.8 MPa .