摘要
利用LS-DYNA有限元软件模拟了卵形弹倾斜冲击作用下平纹织物的动态响应,分析了织物的变形、纱线断裂以及能量吸收特性,讨论了边界约束条件对织物动态响应的影响。结果表明:在弹体贯穿织物过程中,纱线应变能和摩擦耗散能是弹体动能转变的主要形式。在给定的计算时间内,对于四边无约束、对边(经向和纬向)固定约束和四边固定约束的四种边界条件,两者之和占弹体动能损失量的比例不小于80.5%。模拟结果还表明,边界条件对织物的变形、纱线断裂以及能量吸收特性均有明显影响。边界条件不同,纱线断裂数目不同,弹体动能损失量转变成其它能量的比例也不同,导致织物的能量吸收特性也发生变化。
A commercially available finite element analysis code,LS-DYNA,was used to model the dynamic response of plain-woven fabric to ballistic impact of an ogival nosed projectile.The fabric deformation,yarns rupture and time history of energy absorption mechanism were investigated by numerical simulation method,and effects of boundary conditions on the fabric dynamic responses were also discussed.The simulation results showed that the yarn strain energy and frictional sliding dissipated energy were the dominant energies transferred from the kinetic energy of the projectile.At a given time,for the four boundary conditions,including four edges free,two edges（paralleled to warp yarns or weft yarns） clamped and four edges clamped,the sum of yarn strain energy and frictional sliding dissipated energy accounted was not less than 80.5%.Simulation results also indicate that the boundary conditions significantly affect the fabric deformation,rupture of yarns and the mechanism of energy absorption.The number of ruptured yarns and the proportion of energy transferred from the projectile kinetic energy into other energies vary due to different boundary conditions.
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2009年第5期764-769,共6页
Journal of Materials Science and Engineering
关键词
平纹织物
弹道冲击
能量吸收
边界条件
断裂
plain-woven fabric
ballistic impact
energy absorption
boundary condition
rupture
