高性能复合纤维的防刺机理

Recently, there are frequent incidents of police officers and doctors being stabbed. Stabbing-resistant clothing plays a significant role as the last line of defense of human lives. It is typically made of high-strength composite fibers. Despite extensive stabbing resistance testing, the mechanism of such products’ stabbing resistance performance remains unclear. Three typical stab-resistant materials, namely plain woven aramid fabric with epoxy resin, unidirectional high-performance polyethylene fiber cloth, and pure plain woven aramid fabric, are herein examined through bending stiffness, hardness, quasi-static stabbing, and dynamic stabbing tests. The stabbing resistance mechanism of the three materials under specific areal densities are studied. The results show that high-bending stiffness and hardness significantly enhance the quasi-static and dynamic stabbing performance of the product, showing a higher reaction force and smaller deformation. In addition, as most of the weapon’s kinetic energy is transformed into the kinetic energy and deformation energy of the stab-resistant clothing and the backing material, less energy is absorbed for material damage. Therefore, it is more important to enhance the hardness and bending stiffness of the stab-resistant clothing rather than boosting its energy absorption capacity. A new generation of lightweight, flexible stab-resistant products can be developed based on our theoretical findings.