The Design And Properties Study Of The Flexible Armor Composite Materials

Because of the wars and conflicts around the world as well as endless terrorist incidents, military industries are developing rapidly. People around the world pay more and more attention to the research and development of the body armor composite materials. Researchers are actively developing new protective composite materials and increasingly investing human and material resources in composite materials, especially in recent years. However, at present domestic research in new protective composite materials is still in the early stage. Therefore, research into this subject have certain social and economic values as well as academic significance.In this dissertation, firstly, on the basis of a lot of literature and previous experiments, the resin matrix of protective composite materials was considered and studied. The influence of different resin matrixes on stab resistance performance of protective composite materials was analyzed by means of dynamic puncture, tearing strength, single beam strength, and the analysis of surface and fracture morphologies. The results showed that Surlyn is excellent in mechanical properties and stab resistance performance and it is an appropriate resin matrix for protective composite materials.Secondly, the reinforcing fiber for protective composite materials was investigated. The influence of different fibers on stab resistance performance of protective composite materials was analyzed by the same evaluation methods as above. The results showed that Kevlar is a good reinforcing fiber for protective composite materials from the standpoint of mechanical properties and stab resistance performance.Thirdly, the influence of surface density of Kevlar on stab resistance performance of protective composite materials was also considered. Different surface density of Kevlar and Surlyn were processed and their mechanical properties and stab resistance performance were also studied. The results showed that the Kevlar whose surface density is 205 g/m² is excellent in enhancing the mechanical properties and stab resistance performance of the composite materials.Fourthly, the content of nanosized SiO₂ and its influence on stab resistance performance was studied after adding nano-SiO₂ particles in the fabric of protective composite materials. The results showed that the nano-SiO₂ whose content is 5% in the composite is appropriate in enhancing stab resistance performance.Finally, the stab resistance mechanism is discussed. Moderate nano-SiO₂ particles were added into traditional stab resistance materials. Because of excellent strength and toughness of the nano-SiO₂ particles, shock wave forms of energy was effectively absorbed. Stab resistance performance of nano-hybrid composite materials was enhanced. Nano-SiO₂ particles were sprayed and Kevlar fiber was effectively bounded. It played a role in the transmission of impact in adjacent Kevlar fiber.