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基于LS-DYNA的高速破片水中运动特性流固耦合数值模拟
引用本文:康德,严平.基于LS-DYNA的高速破片水中运动特性流固耦合数值模拟[J].爆炸与冲击,2014,34(5):534-538.
作者姓名:康德  严平
作者单位:海军工程大学兵器工程系,湖北 武汉430033
摘    要:基于大型有限元分析软件ANSYS/LS-DYNA,建立三维长方体高速破片在水介质中运动的有限元动力分析模型,采用ALE方法对破片在水下运动过程进行流固耦合数值模拟,获得了破片的速度衰减曲线。研究了速度衰减规律、破片墩粗变形规律以及冲击波传播过程。得到高速破片的侵彻能力随速度的变化规律:当初速度大于910~1 115m/s时破片头部将产生显著变形,并大大影响其侵彻阻力;当破片速度较小时,水中侵彻距离随破片初速的增大而增大,当破片速度达到某临界值以后,侵彻距离将随初始速度的增大而逐渐减小。

关 键 词:流体力学    运动特性    ALE方法    高速破片    侵彻能力    
收稿时间:2013-03-14

Movement characteristics of high-velocity fragments in water medium: Numerical simulation using LS-DYNA
Kang De,Yan Ping.Movement characteristics of high-velocity fragments in water medium: Numerical simulation using LS-DYNA[J].Explosion and Shock Waves,2014,34(5):534-538.
Authors:Kang De  Yan Ping
Institution:Department of Weaponry Engineering, Naval University of Engineering, Wuhan 430033, Hubei, China
Abstract:Based on the large-scale finite element analysis software ANSYS/LS-DYNA, the dynamic analysis model was established for the movement of a three-dimensional rectangular high-velocity fragment in water medium.The multi-material arbitrary Lagrangian Eulerian method was used to simulate the underwater movement process of the high-velocity fragment.And the velocity attenuation curve of the fragment was given.The velocity attenuation, the mushrooming rule and the shock wave propagation process were studied.The penetration performance of the high-velocity fragment was obtained by considering its velocity change.When the initial velocity is 910-1 115m/s, the mushrooming is definite, which will increase the penetration resistance for the fragment sufficiently.When the initial velocity is low, the penetration distance of the underwater fragment will increase with the increasing of its initial velocity.When the initial velocity arrives at some critical value, the penetration distance will decrease as the initial velocity of the fragment increases.
Keywords:fluid mechanics  movement characteristics  arbitrary Lagrangian Eulerian method  high-velocity fragment  penetration performance  water
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