Analysis of the influence of EFP configuration on its aerodynamic characteristics and penetration performance
LI Yuanbo1, WANG Jinxiang1, ZHAO Yaoyao2, TANG Kui1, WANG Hongfei1, CHEN Xingwang1
1.National Key Laboratory of Transient Physics, Nanjing University of Science and Technology, Nanjing 210094, China;
2.Jiangsu Yongfeng Machinery Co., Ltd., Huai’an 211722, China
Abstract:In order to comprehensively analyze the influence of configuration of explosively formed projectile (EFP) on its aerodynamic characteristics and penetration performance, the EFP design with good aerodynamic characteristics and penetration performance is realized. The forming and flight tests of EFP are carried out. On the basis of verifying the numerical validity, the forming process and aerodynamic characteristics of three typical configurations of back-ward-turned EFPs (solid rod, small cavity and large cavity) are analyzed based on ALE algorithm, and the numerical simulation of three configurations of EFPs penetrating semi-infinite thick steel are further carried out. The results show that the small cavity structure of EFP improves its flight stability; the increase of cavity reduces the storage capacity of EFP, and the average velocity decrease of the three types of small-caliber EFPs are 158m.s-1、172m.s-1、210m.s-1 at 1000 times the projectile diameter, respectively; with the increase of EFP cavity, the pit shape of the target plate will gradually change from funnel-shaped to equal-diameter shape. When designing EFP configuration from the perspective of engineering practice, solid type should be selected for short-range targets and small cavity type should be selected for long-range targets.
李渊博1,王金相1,赵瑶瑶2,唐奎1,王鸿飞1,陈兴旺1. EFP构型对其气动特性和侵彻性能影响分析[J]. 振动与冲击, 2023, 42(8): 259-265.
LI Yuanbo1, WANG Jinxiang1, ZHAO Yaoyao2, TANG Kui1, WANG Hongfei1, CHEN Xingwang1 . Analysis of the influence of EFP configuration on its aerodynamic characteristics and penetration performance. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(8): 259-265.
[1] 史庆杰, 曹兵, 池朋飞. 多EFP拦截整体设计及多角度下交汇概率计算[J]. 兵器装备工程学报, 2018, 39(7):36-39.
SHI Qingjie, CAO Bing, CHI Pengfei. Design of intercept system based on MEFP and calculation on multi-angle intersection probability[J]. Journal of Ordnance Equipment Engineering, 2018, 39(7):36-39.(in Chinese)
[2] Berner C. Fleck V. Pleat and asymmetry effect on the aerodynamies of explosively formed penetrators[C]. 18th international symposiumon Ballistic. San Antonio: IBS, 1999: 1-19.
[3] 杨军, 蒋建伟, 门建兵. 准球形爆炸成型弹丸的形成、飞行及侵彻过程的数值模拟[J]. 高压物理学报, 2006,20(4):429-433.
YANG Jun, JIANG Jianwei, MEN Jianbing. Numerical simulation for formation flight and penetration of sphericity EFP[J]. Chinese Journal of High Pressure Physics, 2006, 20(4):429-433.(in Chinese)
[4] 侯云辉, 罗健. EFP的优化设计和飞行稳定性研究[C] // 战斗部与毁伤效率专业委员会第十一届学术交流会论文集.宜昌: 战斗部与毁伤效率专业委员会, 2009:93-198.
HOU Yunhui, LUO Jian. EFP optimization design and flight stability research [C] // Proceedings of the 11th Academic Exchange Conference of Warhead and Damage Efficiency Professional Committee. Yichang: Warhead and Damage Efficiency Professional Committee, 2009:93-198.
[5] 任芮池, 王树有, 蒋建伟, 等. 串联爆炸成型弹丸飞行气动特性的数值模拟研究[J]. 兵工学报, 2017, 38(S1):8-14.
REN Ruichi WANG Shuyou JIANG Jianwei, et al. Numerical simulation of aerodynamic characteristics of double-layer liners EFP[J]. Acta Armamentarii, 2017, 38(S1):8-14.(in Chinese)
[6] 王伟, 徐琳, 王玥兮, 等. 准球形EFP成形因素的正交优化设计与试验验证[J]. 兵器材料科学与工程, 2020, 43(5):22-25.
WANG Wei, XU Lin, WANG Yuexi, et al. Orthogonal optimization design and experimental study on formation process of quasi⁃spheral explosively formed projectile[J] Ordance Material Science and Engineering, 2020, 43(5) :22-25.(in Chinese)
[7] HALLQUIST J. LS-DYNA keyword user’s manual. Version 970 [M].Livermore, CA, US: Livermore Software Technology Corporation, 2003.
[8] 皮铮迪, 陈朗, 刘丹阳, 等. CL-20基混合炸药的冲击起爆特征[J]. 爆炸与冲击, 2017, 37(6):915-923.
PI Zhengdi, CHEN Lang, LIU Danyang, et al. Shock initiation of CL-20 based explosives[J]. Explosion and Shock Waves, 2017, 37(6):915-923.(in Chinese)
[9] Johnson G R, Cook W H . A constitutive model and data for metals subjected to large strains, high strain rates and high temperatures[J]. Engineering Fracture Mechanics, 1983, 21:541-548.
[10] Li W B, Wang X M, Li W B. The effect of annular multi-point initiation on the formation and penetration of an explosively formed penetrator[J]. International Journal of Impact Engineering, 2010, 37(4):14-424
[11] 魏刚,张伟,邓云飞. 基于J-C模型的45钢本构参数识别及验证[J]. 振动与冲击,2019,38(5):173-178.
WEI Gang, ZHANG Wei, DENG Yunfei. Identification and validation of constitutive parameters of 45 Steel based on J-C model[J].Journal of Vibration and Shock, 2019, 38(5):173-178.(in Chinese)
[12] 焦志刚, 杜宁, 贺玉民, 等. EFP速度测量的高速摄影试验研究[J]. 火力与指挥控制, 2018, 43(6):180-183.
JIAO Zhigang, DU Ning, HE Yumin, et al. Experimental investigation of EFP velocity measurement with high-speed photography[J]. Fire Control &Command Control, 2018, 43(6):180-183.(in Chinese)
[13] 丁丰, 赵太勇, 杨宝良, 等. 尾翼EFP成型及气动的数值模拟[J]. 弹箭与制导学报, 2021, 41(03):115-118+122.
DING Feng, ZHAO Taiyong, YANG Baoliang, et al. Numerical simulation of fin EFP forming and aerodynamics[J]. Journal of Projectiles, Rockets, Missiles and Guidance, 2021, 41(03):115-119+122(in Chinese)
[14] 魏惠之. 弹丸设计理论[M]. 北京:国防工业出版社, 1985: 216-217.
WEI Huizhi. Projectile design theory[M]. Beijing: National Defense Industry Press,1985: 216-217.(in Chinese)
[15] 袁焘, 赵斌, 高光发, 等. 异形截面侵彻体垂直侵彻半无限金属靶试验研究[J]. 振动与冲击, 2020, 39(22):229-233.
YUAN Tao, ZHAO Bin, GAO Guangfa, et al. Experimental study on the vertical penetration of novel-section projectiles
into a semi-infinite metal target[J]. Journal of Vibration and Shock, 2020, 39(22):229-233.(in Chinese)
[16] 龙源, 刘健峰, 纪冲, 等. 多点起爆对双层药型罩爆炸成型弹丸成型及侵彻特性的数值模拟研究[J]. 兵工学报, 2016, 37(12):2226-2234.
LONG Yuan, LIU Jianfeng, JI Chong, et al. Numerical simulation on formation and penetration of double-layer
liners EFP warhead influenced by multi-point initiation [J]. Acta Armamentarii, 2016, 37(12): 2226-2234.(in Chinese)