基于纤维混杂的防弹防刺材料结构设计与优化

Counter-terrorism personnel need to address both stabbing and shooting threats when dealing with urban violent terrorist attack. Single-function protective gear is insufficient to ensure life safety. A multifunctional protective effect can be achieved by combining the bulletproof and stab-resistant materials based on their protective mechanisms. Currently, the development of dual-protection suits based on composite materials primarily relies on trial and error in experiments,resulting in low design efficiency and high costs. To address this issue,a theoretical design and optimization method is proposed for fiber-mixed bulletproof and stab-proof structures based on energy absorption criteria. Ballistic experiment and dynamic puncture test are conducted using single protective materials,namely resin-coated aramid fabric and unidirectional ultra-high molecular weight polyethylene(PE)fabric. The ballistic and puncture kinetic energy absorptions of single material are calculated. Based on the law of energy conservation,a combined bulletproof and stab-proof structure with a given areal density of 8 500 g/ m² is designed,and the range of layers for bulletproof and stab-proof materials is determined,After validation through ballistic and dynamic puncture experiments,the theoretical calculations demonstrate sufficient safety margins,The combination of 11 layers of resin-coated aramid fabric and 18 layers of unidirectional PE fabric meets the requirements of GA68-2019 Police Stab-resistant Clothing and police level III bulletproof standards while being the lightest with an areal density of 8 390 g/ m². The bulletproof and stab-proof structure is optimized to achieve the lightest combination structure with an areal density of 8 370 g/ m²,consisting of 9 layers of resin-coated aramid fabric and 21 layers of unidirectional PE fabric. These research findings can provide reference for the engineering design and innovative application of dual-protection suits.