EXPERIMENTAL STUDY ON CRITICAL ENERGY RELEASE RATE OF TENSILE AND COMPRESSIVE FAILURE MODES IN FIBER DIRECTION OF GFRP

Abstract

 Progressive damage analysis is one of the ways which can consider the nonlinear behavior of FRP composite materials. In the progressive damage analysis, the critical energy release rate is used to define the stress-strain relation after the initiation of damage. In this study, compact tension test (CT test) and compact compression test (CC test) were carried out to obtain the critical energy release rate of tensile and compressive failure modes in fiber direction of GFRP. To identify the crack length during the CT and CC tests, the digital image correlation method was used. From this study, it was shown that the critical energy release rate in tension is almost the same as the value obtained in the past research for a similar material, and that the critical energy release rate in tension exceeds the critical energy release rate in compression.