Experimental Study On Mechanical Properties Of Composite Composites At Low Velocity Impact

Fiber hybrid composite materials have flexible design ability because of fiber type, hybrid structure and hybrid ratio, there is a variety of hybrid effects. Hybrid composite materials can be used to maintain the advantages of single fiber composites, and to some extent, the short board effect of the mechanical properties can be improved.In this paper, the development of high performance fiber is studied, and the low speed impact performance of two types of fiber hybrid composites is studied,1.Aramid/UHMWPE fiber hybrid composites,2carbon/aramid fiber hybrid composites Each types hybrid composites were designed in two kinds of interlayer hybrid, two kinds of sandwich hybrid and one interlayer hybrid, a total of five kinds of hybrid structure. Compare the differences between the properties of hybrid structure, preferably excellent performance of the hybrid structure, From the experimental point of view, for the hybrid composite material impact resistance designed to provide a theoretical basis.Aramid/UHMWPE fiber hybrid composites have flexible design and weight loss efficiency. In this paper, five kinds of different hybrid structures of Aramid/UHMWPE fiber hybrid composite laminates were prepared, including two kinds of interlayer hybrid, two kinds of sandwich hybrid and one interlayer hybrid, and they were tested by falling weight impacts to study the hybrid structure and the effects of the UHMWPE fiber content on the impact peak load, the elastic energy and the impact damage. Results show that the Aramid/UHMWPE fiber hybrid composite laminates peak load is larger than two kinds of single fiber composite laminates. Aramid fiber interlayer hybrid laminate present maximum peak impact load on the impact front and back surface, and there exist serious delamination damage on the impact front and back surface of UHMWPE fiber laminate. Five kinds of hybrid structure laminates absorption energy are less than that of single fiber laminates, and elastic energy is more than that of single fiber laminates. The interlayer hybrid laminate show the minimum damage area for the equal impact energy. With the increase amount of the UNMWPE, the impact load will be changed from increase to reduction. When the amount comes to 40%, and the interlayer hybrid laminates show the largest impact load.For Carbon/Aramid Fiber Hybrid Composites laminates, impact load, DI(ductility index), impact damage morphology, pit depth, internal damage and so on are discussed. The results show:Carbon fiber laminates showed the largest impact load peak, the aramid fiber laminate showed the smallest impact load peak, hybrid Composites impact load peaks in between. In hybrid composites, the interlayer hybrid exhibits the largest load peak value. Five kinds of structural carbon/aramid fiber hybrid composites have high DI value. The DI value of interlayer hybrid was the biggest, which showed a good impact toughness. In the case of similar impact energy, five hybrid structure composites, the inter-layer hybrid laminates have minimum impact damage area, demonstrated the good impact damage resistance.