Fiber-matrix interface mechanical properties of carbon-carbon composites

Abstract

Fiber-matrix interface mechanical properties are the key design point for the composites, however, methodology for evaluating interface properties of C/Cs are not still well established. In this study, the fiber bundle push-out method was conducted to measure fiber-matrix interfacial mechanical properties of various C/Cs. The influences of a radius of an indenter and the thickness of specimens on the measured results were examined to carefully determine the experimental conditions to give proper interface mechanical properties. To find out the effects from initial interface debonding, the observation of the polished cross sections of the various C/Cs tested in the fiber bundle push-out test were conducted. The material processing factors responsible for determining the interfacial mechanical properties of C/Cs were discussed in detail.