Study On Tensile Properties Of Glass/Carbon Fiber Reinforced Plastics Hybrid Composites

With the development of material technology, hybrid composites have been used in more and more fields. Glass fiber has a higher elongation, lower elastic modulus and a lower price, while carbon fiber has a lower elongation, higher elastic modulus and a higher price. The hybrid of the two fibers can lead to hybrid effect and get good comprehensive mechanical properties.Seven kinds of different lay-ups were designed and the tensile properties of multi-directional hybrid composites reinforced by glass fiber and carbon fiber were gained, the force-displacement curves and corresponding damage morphology were got by experimental research. A conception of lay-up angle hybrid ratio was proposed and the influences of different lay-up angle hybrid ratio on the tensile properties were studied. The results show that the 0 ? hybrid ratio affects the properties the most while 90 ? hybrid ratio the least, the ?45? hybrid ratio is between both.The influence that the hybrid ratio and the dispersion degree had on the hybrid effect was considered and the corresponding correction formula of the tensile modulus of unidirectional hybrid composites was proposed. The tensile modulus of multi-directional hybrid composites was also estimated on the basis of CLT, and a better result was got.The correction formula of fracture strain hybrid effect coefficient was proposed and the strength correction formula of the interlayer ply GF/CF HFRP was got on the basis of the mixing rule. By the formula as well as the finite element analysis model of progressive damage on multi-directional laminated composite, a method of multi-directional CF/GF HFRP tensile strength estimating formula was proposed. The result shows that the analysis method is effective and the method which considered hybrid effect agrees more with experiment.