Study On The Performance Of 3D Fabric Forming Peocessing And Nano Composite Material

3D fabric is a kind of design diversity, structure more complex three-dimensional fabric.Because of the thickness direction reinforced fiber in 3D fabric composite material, so it has better mechanical properties. Angle interlock woven fabric composite material is one of the most widely used in the 3D fabric, it can used in bulletproof vests, aerospace and other fields.This structure can be on ordinary loom for weaving, realizing the needs of a variety of mechanical properties in flexible to change the base fabric structure, having a great development prospect. However, the epoxy resin in composite materials show the poor toughness and impact resistance. It make its application limited. So let it modifieded is necessary, which is extended three-dimensional fabric composite material application in the field of a kind of method.In this paper 1500 D untwisted aramid fiber filament was woven into twelve layer angle interlock fabric by using a semi-automatic sample weaving machine. Epoxy resin was modified by nano-silica powder. The epoxy resin structure and modification mechanism before and after modification are analyzed in detail by infrared spectrum analyzer. After adding nano-silica, chemical reactions occurred between the nano-silica and epoxy resin, epoxy reduced and generated silicon carbon oxygen(Si-O-C) bond which increases the toughness of epoxy resin.Then using the hand layup molding method to manufacture 3D angle interlock fabrics nano composite material plate. According to the standards, the specimen were cut into the required size. Tensile, bending and impact tests were performed, aiming to analyze the mechanical properties and fracture morphology of the composites.Results show that when the concentration of nano-silica was 3%, the tensile strength and elastic modulus were both increased by 10.5%; the impact strength increased by 56.8%; and the bending strength and bending elastic modulus respectively increased by 27.3% and 45.4%, indicating that the improvement in impact property due to the silica toughening effect on epoxy resin. If the nano-silica content increases, the performance will decrease. Because when the concentration is too large, it is difficult for nano-silica to disperse evenly in the epoxy resin. This forms a stress concentration point, and hence mechanical performance decreases.