Non-woven Fabric Reinforced Preparation And Mechanical Properties Of The Composites

There are three mainstays in science and technology :Material, energy and information. With the development of productive force and the improvement of standard of living, the science of material makes great progress because of the transition from metal, inorganic compound and macromolecule to composites. The natural resources are becoming shortage because human beings are consuming more structural materials. The disafforestation is not only causing the exhaustion of wood but also leading to the destroying of entironment. Then the composite appears and can replace the wood, so it grows very fast. C-fibre reinforced composite has a high performance, but it is very expensive. In order to reduce cost, the subject comes up with a new method of producing composite, that means nonwoven fabric reinforced polymer composites.In this paper, the technological process and the mechanical properties of nonwoven fabric reinforced polymer composites are studied. It adopts the methods of macroscopical testing and microcosmic teting. The microstructure of tensile depredation of composite is observed by using scanning electron microscope. The effect of intensifier and other conditions on the mechanical properties of composite is studied for the sake of searching the optimal compounding and the optimal technological process.First, a series of composites are manufactured by means of different nonwoven fabric and different resin. The dissimilar methods are adopted including hand molding, vacuum-bag molding and vacuum assistant resin injection. Second , many mechanical properties are tested, for example,tensile strength and tensile modulus, flexural strength and flextural modulus and impact strength. By the analysis of the tensile stress-strain curves and the flexural stress-strain curves, the results are as follows: 1) The voluminal content of fibre of composite making by vacuum assistant resin injection is more than other composites. 2) The mechanical properties of the needlepunching nonwoven fabric reinforced polymer composite are superior to these of the calendering nonwoven fabric reinforced polymer composite. Finally, from the point of view of microstructure, it examines the microcosmic shape of destroying and interprets the modality of section.