Movement characteristics of high-velocity fragments in water medium: Numerical simulation using LS-DYNA
-
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。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.
-
图 5 冲击波压力峰值与破片初速的关系
Figure 5. Relation between the peak pressure of the shock wave and initial velocity
-
[1] 沈晓乐, 朱锡, 侯海量, 等.高速破片侵彻防护液舱试验研究[J].中国舰船研究, 2011, 6(3): 12-15. http://d.wanfangdata.com.cn/Periodical/zgjcyj201103003Shen Xiao-le, Zhu Xi, Hou Hai-liang, et al. Experimental study on penetration properties of high velocity fragment into safety liquid cabin[J]. Chinese Journal of Ship Research, 2011, 6(3): 12-15. http://d.wanfangdata.com.cn/Periodical/zgjcyj201103003 [2] 白金泽. LS-DYNA3D理论基础与实例分析[M].北京: 科学出版社, 2005. [3] 吴建萍, 魏志芳, 李柱.基于LS-DYNA的球形破片侵彻明胶的数值模拟[J].机电技术, 2011, 1: 28-30. http://www.cnki.com.cn/Article/CJFDTotal-JDJS201101011.htmWu Jian-ping, Wei Zhi-fang, Li Zhu. Numerical simulation of spherical fragment penetrating into gelatin based on ANSYS/LS-DYNA[J]. Mechanical & Electrical Technology, 2011, 1: 28-30. http://www.cnki.com.cn/Article/CJFDTotal-JDJS201101011.htm [4] Trevino T. Applications of arbitrary lagrangian eulerian(ALE)analysis approach to under water and air explosion problems[R]. AD-A384983, 2000. [5] 王肖钧, 赵新.高速钢球在水中贯穿过程的数值计算[J].爆炸与冲击, 1992, 12(3): 213-218. http://www.cnki.com.cn/Article/CJFDTotal-BZCJ199203003.htmWang Xiao-jun, Zhao Xin. Numerical study of a steel ball penetrating in water with high speed[J]. Explosion and Shock Waves, 1992, 12(3): 213-218. http://www.cnki.com.cn/Article/CJFDTotal-BZCJ199203003.htm [6] Tate A. A theory for the deceleration of long rods after impact[J]. Journal of the Mechanics and Physics of Solids, 1967, 15(6): 387-399. http://www.sciencedirect.com/science/article/pii/0022509667900105 -
下载:
图(6)
计量
- 文章访问数: 3700
- HTML全文浏览量: 432
- PDF下载量: 593
- 被引次数: 0