摘要
为研究爆轰驱动下椭圆截面自然破片杀伤战斗部壳体的膨胀破裂过程以及壳体破片径向速度分布,建立了椭圆截面战斗部三维模型。通过AUTODYN-3D软件,采用Lagrange算法模拟爆轰驱动下椭圆截面自然破片战斗部壳体的膨胀断裂过程,研究了端面单点中心起爆方式下短长轴断裂时间差与短长轴比的关系,以及不同起爆点、不同短长轴比和不同装填比(即装药与壳体质量之比)对椭圆截面战斗部径向破片速度分布的影响。结果表明:与端面中心单点起爆、端面长轴双点偏心起爆和端面短长轴四点偏心起爆相比,端面短轴双点偏心起爆方式对椭圆截面战斗部壳体破片径向速度的增益效果最好。装填比一定时,短、长轴断裂时间以及短、长轴断裂时间差与短长轴比呈线性关系,战斗部壳体膨胀过程中截面形状的实时短长轴比与加载时间呈线性关系;随着短长轴比的增大,战斗部壳体破片径向速度增益逐渐减小。短长轴比一定,装填比小于1时,破片速度随方位角增大呈正弦趋势上升,且短、长轴方向破片速度差与装填比呈线性关系。
In order to study the expand-rupturing process and the radial velocity distribution of the elliptical cross-section natural fragment warhead shell driven by detonation,a three-dimensional model of the elliptical cross-section warhead was established.The AUTODYN-3D software was used to simulate the expansion and rupture process of the elliptical cross-section natural fragment warhead shell driven by detonation with Lagrange algorithm.The relationship between the minor-major axis fracture time difference and the minor-major axis ratio under the single-point central initiation mode of the end face was studied.The influence of initiation points,minor-major axis ratio and loading ratio(i.e.the mass ratio of charge and shell)on the radial velocity distribution of the elliptical cross-section warhead was studied.The results show that compared with the single-point initiation at the center of the end face,the double-point eccentric initiation at the major axis of the end face and the four-point eccentric initiation at the minor axis of the end face,the double-point eccentric initiation at the minor axis of the end face has the best effect on the radial velocity gain of the elliptical cross-section warhead shell.When the loading ratio is constant,the fracture time of the minor and major axes and the difference between the fracture time of the minor and major axes are linearly related to the minor and major axis ratio.Meanwhile,the real-time minor and major axis ratio of the crosssection shape during the expansion of the warhead shell varies linearly with loading time.The radial velocity distribution of warhead shell fragments decreases with the increase of minor-major axis ratio.When the ratio of minor axis to major axis is constant and the loading ratio is less than 1,the fragment velocity increases sinusoidally with the increase of azimuth angle,and the difference of fragment velocity in minor and major axes shows a linear relationship with the loading ratio.
作者
邓宇轩
张先锋
冯可华
刘闯
杜宁
刘均伟
李鹏程
DENG Yuxuan;ZHANG Xianfeng;FENG Kehua;LIU Chuang;DU Ning;LIU Junwei;LI Pengcheng(School of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing 210094,Jiangsu,China;Jiangsu Yongfeng Machinery Co.Ltd.,XuYi 211722,Jiangsu,China)
出处
《高压物理学报》
CAS
CSCD
北大核心
2022年第2期153-163,共11页
Chinese Journal of High Pressure Physics
基金
中央高校基本科研业务费专项资金(30919011401)。
关键词
椭圆截面战斗部
自然破片
膨胀断裂
破片速度
数值模拟
elliptical cross-section warhead
natural fragmentation
expand-rupturing
numerical simulation
fragment velocity
