纤维材料本构应变率效应和纤维集合体弹道冲击破坏机理

ABSTRACT: Fiber assemblies are widely used in ballistic protection field because of their flexibility. The inventions of high modulus and high strength organic fibers such as PPTA, high strength PVA and PE are the new impetuses to broaden the usage of fiber assemblies in ballistic protection, for example, personal armor. The contents of this NSFC-supported project is mainly.focused on: (1) strain rate effect of fibers’ mechanical properties under ballistic impact; (2) ballistic impact tests, analytical modeling and FEM numerical modeling of multi-layered fabric.targets; (3) ballistic impact tests, analysis of damage mode, FEM numerical modeling of 4-step 3-D braided composites; (4) structure deformation of 2-D and 3-D fiber assemblies under ballistic impact, absorptions of kinetic energy of projectile by fabric targets. From the calculated results of analytical model of multi-layered fabric target perforated by rigid conically-cylindral projectile.and strain rate effect of mechanical property of fibers, it is concluded that the main ways of kinetic energy absorption by fabric target are the failure of fibers and deformation of fabric structure. The.bulletproof property of fabric target could be improved by increasing of broken work of fibers and structure deformation of fabrics. Furthermore, it is also shown that only the strain rate effect is.considered could the high precision of calculated results be obtained. This NSFC-supported project is a cross research between the ballistic penetration and the structure of fiber assemblies. The main results of this project are new contents both for terminal ballistics and textile science, and could be adopted in the research of ballistic penetration of fiber assemblies reinforced composites, also in the design of ballistic protection materials.

揭示纤维材料本构应变率效应，得到低、中、高应变率范围内的拉伸本构方程。研究纤维集合体在弹道冲.击作用下的结构变化、破坏模式、吸能机制，从静、动态侵彻贯穿研究中得搅秸呒涞牧担赋龃泳蔡?特性近似动态特性的方法，提出提高纤维集合体弹道.冲击性艿慕峁固卣鳎佣欣谙宋銮扛春喜牧?弹道冲击破坏机理的解决。...........