STRAIN-RATE AND TEMPERATURE-DEPENDENCE OF TENSILE-STRENGTH FOR CARBONGLASS-FIBER HYBRID COMPOSITES

The tensile strength of epoxy resin reinforced with a random planar or ientation of short carbon and glass fibres increased as the strain rat e increased, and the increase in tensile strength became slightly rema rkable with increasing temperature. The strain rate-temperature superp osition was held for each composite. The strain rate and temperature d ependence of tensile strength of composites could be estimated based o n the dependence of the mechanical properties of the matrix resin, the interfacial yield shear strength and the critical fibre length. The s train rate and temperature dependence of the tensile strength of the h ybrid composite could be estimated by the additive rule of hybrid mixt ures, using the strain rate and temperature dependence of the tensile strength of both composites. The experimental values at a higher rate were lower than the calculated values. It was hypothesized that this m ay have been caused by the ineffective fibres formed during preparatio n of the specimen.