非轴对称结构约束下破片飞散特性的试验和仿真研究  

Tests and simulation for dispersion properties of fragments from asymmetric structures

作　　者：王马法[1,2] 卢芳云[2] 李翔宇[2] 林玉亮[2] 黄洁[1] 

机构地区：[1]中国空气动力研究与发展中心超高速所,四川绵阳621000 [2]国防科学技术大学理学院,长沙410073

出　　处：《振动与冲击》2016年第15期122-126,139,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金资助项目(11202237)

摘　　要：为了研究爆炸变形式破片战斗部变形型面与破片飞散特性的关系,对113mm口径的D型结构型面约束下的破片飞散特性进行了试验,并采用LSDYNA软件对内凹、外凸和D型等三种型面约束下破片的飞散特性进行仿真研究,获得了破片的空间分布特性和初速随方位角的分布规律。结果表明,D型结构的破片主要聚焦在目标方向±10°范围内,且偏心起爆的聚焦效果略好于中心起爆;不同起爆方式下目标方向的破片初速相差不大,都是随方位角的增加而降低;不同型面约束下破片飞散偏折角与爆轰波入射角之间近似满足不同斜率的线性关系。最后根据该线性关系特征提出了能够计算不同型面下飞散偏折角随入射角变化的工程计算式。In order to study dispersion properties of fragments from deformable warheads affected by a deformed outline,tests of D-outline structures and simulation of concave,convex and D-outline structures were implemented to analyze dispersion properties of fragments.The results of fragments distribution and initial velocities were obtained from tests and simulation.The simulation results were in good agreement with test data.The results showed that fragments focus on a range of ＆#177;1 0＆#176;around the target direction;the focusing effect of fragments from asymmetrical initiation structures is better than that from central initiation ones;the initial velocities decrease with increase in azimuth angle,and they are little different for different initiation types qualitatively and quantitatively;the relations between the projection angle of fragments and the incident angle of shock waves are linear with different slopes for different outline structures;based on the linear relation,an engineering formula is proposed to calculate the projection angle for different outline structures.

关 键 词：爆炸力学 爆炸变形式战斗部 D型结构 飞散偏折角 

分 类 号：O383[理学—流体力学]