摘要
为准确计算多层球形破片在爆炸驱动下的初速场,通过对装药结构的等效分析,基于Gurney假定和相邻层颗粒之间力和力的波动量等概率传递假定,忽略排列方式引起的孔隙率变化,应用动量和能量守恒建立了破片初速场的理论计算模型。该模型反映了炸药参数和破片的密度、层数和直径等因素对破片初速的影响;针对典型的爆炸驱动前向多层破片模型,用LS-DYNA3D非线性有限元程序对多层钨球破片的爆炸驱动过程进行数值模拟,开展了相关验证试验并分析了理论计算值与试验误差产生的原因,分析讨论了不同球形破片直径和不同破片层数下破片初速的变化情况。结果表明:理论计算值与数值模拟及试验结果吻合较好;随着相同直径破片层数的增大,破片初速减小,相邻层间破片的速度差值更大;层数相同时,随着破片直径的减小,破片初速增大,但相邻层数破片的速度差值更小。
In order to calculate the initial velocity field of a multi-layer spherical fragment under the explosion drive accurately,based on the Gurney hypothesis and the assumption of equal probability of the force and force between adjacent layer particles a theoretical calculation model of the initial velocity field of the fragment was established by applying momentum and energy conservation.In the calculation model,the difference of the void ratio caused by arrangement was ignored.The model can reflect the influence of explosive density and fragment density,layer number and diameter on the initial velocity of the fragment.The LS-DYNA 3D nonlinear finite element program was used to simulate the explosion driving process of multi-layer tungsten spherical fragments under different conditions.Relevant verification tests were carried out and the reasons for the errors between theoretical and test results were analyzed.The variation of the initial velocity of the tungsten bead fragments under different tungsten bead diameters and different fragmentation layers were discussed.The results show that the theoretical calculations agree well with the numerical and experimental results.As the number of fragments increases,the fragmentation speed will decrease,but the velocity difference between adjacent layers will be larger.As the diameter of the tungsten beads decreases,the fragmentation speed increases,but the difference in velocity between adjacent layers is smaller.
作者
陈兴旺
王金相
唐奎
林尚剑
李元龙
CHEN Xingwang;WANG Jinxiang;TANG Kui;LIN Shangjian;LI Yuanlong(National Key Laboratory of Transient Physic,Nanjing University of Science and Technology,Nanjing 210094,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2020年第16期129-134,共6页
Journal of Vibration and Shock
基金
国家自然科学基金(11672138)。
关键词
多层破片
爆炸驱动
理论计算模型
Gurney模型
数值模拟
multilayer fragments
explosion drive
theoretical calculation model
Gurney model
numerical simulation
