Study on the mechanical performances of carbon fiber/epoxy composite material subjected to dynamical compression and high temperature loads

SHPB system was widely used to investigate the dynamical mechanical performances of materials. In this study, the mechanical performances of T700/BA9916 composite material were investigated through experiment and numerical simulation. The true stress-strain curves of composite samples were obtained, and the influences of temperatures and strain-rates on the mechanical performances of composite samples were discussed. The finite element model of SHPB setup was established, and the compression mechanical performances of composite samples were simulated. T700/BA9916 composite material exhibited significant temperature softening and strain-rate enhancement effect during experimental. The compression failure strength and elastic modulus increased with the increase in strain-rates while the failure strain decreased. The compression failure strength and elastic modulus decreased with the rise in temperatures while the failure strain increased. The composite samples didn't exhibit typical brittle failure at high temperature but significant temperature softening effect. A plateau phase existed between incident wave and reflection wave, and the slope of plateau phase was small when temperatures were low while that was large when temperatures were high. The numerical results were compared with experimental results to validate the proposed numerical method can be used to simulate the mechanical performances of composite materials.