摘要
为探究钨合金弹体超高速撞击混凝土靶的成坑直径和成坑体积随动能变化的规律,采用二级轻气炮开展了钨合金弹体以1.97～3.66km/s的速度撞击混凝土靶实验,利用CT图像诊断方法得到了实验后的成坑特性实验数据,并基于点源假设进行了超高速撞击条件下成坑特性的量纲归—化分析。结果表明:超高速撞击条件下靶板成坑为"弹坑+弹洞"型;成坑直径和成坑体积随动能增加而单调递增,通过量纲分析得到成坑直径3次方和成坑体积都与弹体动能近似成正比,拟合指数μ接近动能主导的指数2/3,说明成坑过程主要受动能影响.
In order to explore the cratering mechanism of concrete targets undergoing hypervelocity impact,experiments were carried out by two-stage light gas gun with Gram-grade cylindrical tungsten alloy projectiles,impacting concrete targets at velocities from 1.97 to 3.66 km/s.Experimental data of crater were obtained by computerized tomography(CT).Dimensionless analyses based on point source solution were used to further analyze the mechanism of hypervelocity impact.The results showed that:the craters were structured by spalling areas and bullet holes;the body penetration stage occupied a large proportion of the total penetration depth,so that the penetration depth was not positively related to the kinetic energy.The dimension of the cubic crater diameter and the crater volume are proportional to the kinetic energy of the projectiles,which indicates that the cratering process is mainly affected by the kinetic energy.
作者
钱秉文
周刚
李进
张德志
张向荣
朱玉荣
景吉勇
谭书舜
李运良
QIAN Bing-wen;ZHOU Gang;LI Jin;ZHANG De-zhi;ZHANG Xiang-rong;ZHU Yu-rong;JING Ji-yong;TAN Shu-shun;LI Yun-liang(Department of Engineering Physics,Tsinghua University,Beijing 100084,China;Northwest Institute of Nuclear Technology,Xi an,Shaanxi 710024,China)
出处
《北京理工大学学报》
EI
CAS
CSCD
北大核心
2018年第10期1012-1017,共6页
Transactions of Beijing Institute of Technology
关键词
超高速撞击
成坑特性
量纲归一化分析
二级轻气炮
混凝土靶
CT图像诊断
hypervelocity impact
cratering
dimensionless analysis
two-stage light gas gun
concrete target
computerized tomography(CT)
