Study On Preparation, Performance Test And Anti-Collision Application Of Hybrid Fabric Reinforced Composites

In recent years,the development of fiber reinforced composites has been mature,and it has been widely used because of its light weight,high strength and corrosion resistance.However,single fiber composite still has many disadvantages,such as weak shear resistance of carbon fibers and high cost of aramid fiber preparation.Researchers have found that mixing different fibers in different proportions can greatly weaken the drawbacks of a single fiber and improve the comprehensive properties of composite materials.Nowadays,the research on hybrid fiber composites is still one of the hotspots.In this paper,the advantages and disadvantages of many preparation methods are summarized through the investigation of various preparation methods of fiber reinforced composites.According to the actual conditions,16 groups of hybrid fabric reinforced composites are prepared by vacuum bag pressure forming process.The hybrid combination of 16 groups of hybrid fabric reinforced composites takes into account the factors of hybrid composition,hybrid ratio and hybrid structure,which can reflect the hybrid effect comprehensively.In order to investigate the effect of hybrid mode on uniaxial tensile properties of hybrid fabric composites,uniaxial tensile tests were carried out on 16 groups of hybrid fabric reinforced composites,and their tensile modulus,tensile strength and elongation at break were measured.The results show that when the two kinds of fibers are mixed,the energy absorption capacity of aromatic-glass hybrid specimens is improved,the multi-stage damage of materials occurs,and the safety of use is improved;the stiffness and strength of carbon-glass hybrid specimens are improved,and the hybrid effect is better.When three kinds of fibers are mixed,the hybrid effect is mainly related to the type of hybrid interface and the dispersion of fibers,and the hybrid effect is general.In order to investigate the effect of hybrid mode on the low-speed impact properties of hybrid fabric composites,16 groups of hybrid fabric reinforced composites were tested by low-speed impact tests of simple-supported beams,and the impact force and energy absorption were measured.The results show that when the two fibers are mixed,the impact force on the specimens depends on the stiffness of the material.Among them,aromatic-glass hybrid can effectively reduce the impact force of materials and play a better cushioning capacity;the energy absorption capacity of samples is related to material characteristics and damage mode of laminates.When carbon fibers are in tensile damage in hybrid,the energy absorption effect is better.When the three kinds of fibers are mixed,because the hybrid of carbon fibers and aramid fibers is relatively low,the material can not highlight the advantages of the two kinds of fibers,and the hybrid effect is general.In order to explore the engineering application prospects of hybrid fabric composites,this paper applies hybrid fabric composites to the field of bridge anticollision.The Hashin criterion is modified by using the VUMAT subroutine of ABAQUS,and the simulation of the collision process of the hybrid fiber reinforced composite anti-collision device subjected to ship impact is carried out.Results Surface: The damage mode of anti-collision device is complex.When aramid fibers are mixed,the anti-collision device can not only effectively reduce the size of collision force,but also improve the energy absorption of anti-collision device and effectively protect piers and bows.When the three kinds of fibers are mixed,aramid fibers have low content and general hybrid effect.