Behaviour of Fibre-Reinforced Composites Under Dynamic Tension

摘要

Epoxy specimens reinforced with plain-weave fabrics of either carbon or glass or with several hybrid combinations of the two in various lay ups, giving five different weight fractions of reinforcement from all carbon to all glass have been tested in tension at an intermediate strain rate of 10/s and a quasi-static strain rate of 10-3/s. Stress strain curves are obtained and are compared with those derived in an earlier stage of the investigation at an impact strain rate of 1000/s. The effect of both hybrid composition (volume fraction of carbon reinforced plies) and applied strain rate on the tensile modulus, the tensile strength and the strain to fracture is determined and a limited hybrid effect is observed in specimens with a carbon volume fraction in the approximate range 0.6 to 0.7 where, at all three strain rates, there is an enhancement of the failure strain over that for the all carbon plies and an increased failure strength, most marked in the impact tests, over that predicted by the rule of mixtures. (Keywords) Fibre reinforced composites, dynamic tension, tensile impact testing, Hopkinson bar.