A methodology for measuring interface fracture properties of composite materials

摘要

methodology is presented for a measuringinterface fracture properties of composite materials. A bimaterialBrazilian disk specimen with a crack along the interface isemployed. The specimen is analyzed by means of the finiteelement method and a conservative integral to determine stressintensity factors as a function of loading angle and crack length.A weight function is employed to determine the effect of residualcuring stresses on the stress intensity factors. These are combinedto determine the critical interface energy release rate g_(ic) as afunction of stress intensity phase angle #PSI# for tests carried outon a glass/epoxy material pair.