平头弹冲击作用下平纹织物的动态响应分析

Dynamic Response of Plain-woven Fabric Subjected to Ballistic Impact of a Flat-Nosed Projectile

利用LS-DYNA有限元软件模拟了平头弹垂直冲击作用下平纹织物的动态响应,分析了织物的变形、纱线断裂、冲击载荷以及能量吸收特性,讨论了不同弹体冲击速度对织物动态响应的影响。结果表明:平头弹冲击作用下织物的破坏形式为弹体边缘的剪切破坏。在弹体贯穿织物过程中,纱线应变能、纱线动能和摩擦耗散能是弹体动能转变的主要能量形式。结果还表明,当弹体冲击速度小于临界速度时,织物吸收的能量随冲击速度的增加而增大,弹体冲击速度大于临界速度时织物吸收的能量逐渐降低。本文数值模拟结果与已有实验结果进行了对比,分析表明平头弹冲击织物时的横向偏移变形和吸能特性曲线均吻合较好。

A commercially available finite element analysis code,LS-DYNA,was used to model the dynamic response of plain-woven fabric under ballistic impact of a flat-nosed projectile.The fabric deformation,yarns rupture,impact load and energy absorption mechanism were investigated by numerical simulation method,and the effects of different impact velocities of the projectile on the fabric dynamic responses were also discussed.The simulation results showed that the yarn strain energy,the yarn kinetic energy and frictional sliding dissipated energy were the dominant energies transferred from the kinetic energy of projectile.The fabric was sheared by the circumferential edge of the flat-nosed projectile when it pressed against the fabric upon impact.Simulation results also indicated that energy absorbed increases with impact velocity of the flat-nosed projectile up to a critical impact velocity before it starts to decrease.The numerical simulation results were compared with existing experimental results,both transverse deflection in the yarns and energy absorption characteristics of fabric are consistent with the experimental results.