Combined Damage Behavior of Penetration and Blast of Reactive/Metal Tandem EFPs

doi:10.12382/bgxb.2022.0356

Abstract

Abstract:

In order to improve the comprehensive damage effects of the explosively formed projectile (EFP) to the target, a shaped charge structure with reactive/metal composite spherical liners is proposed. The composite liners include an inner copper liner and an outer reactive liner, and the outer reactive liner is prepared by PTFE/Al energetic powder with a mass ratio of 73.5%/26.5% through cold pressing and sintering processes. The combined damage behavior of penetration and blast of the reactive/metal tandem EFPs for the spaced target plates is investigated by static explosion experiments. The results show that the reactive/metal tandem EFPs not only have an effective penetration effect on the spaced target plates, but also generate detonation-like reaction among the plates, improving the damage effects on the target plates. The number of penetrated layers and perforation diameter of the plates damaged by the reactive/metal tandem EFPs are significantly influenced by the plate thickness. As the thickness of the first two layers of the spaced target plates increases from 10mm to 20mm, the total number of penetrated layers decreases from 6 to 3, and the perforation diameter also significantly reduces. By adopting the SPH algorithm, the numerical simulation reveals that the reactive/metal composite liners form a composite penetrator with a copper EFP in front and a reactive EFP partially embedded in the precursor copper EFP. Then, through the introduction of reaction delay time and material model transformation, the numerical simulations further reveal that the detonation-like reaction of the trailing reactive EFP results in the expansion of the precursor metal EFP, leading to the increase of the perforation diameter and the decrease of the penetration capability.

Key words: explosively formed projectile, reactive materials, penetration and blast, damage

CLC Number:

TJ413

ZHENG Yuanfeng, WANG Shipeng, LI Peiliang, ZHANG Yong, GE Chao. Combined Damage Behavior of Penetration and Blast of Reactive/Metal Tandem EFPs[J]. Acta Armamentarii, 2023, 44(8): 2273-2282.

Figures/Tables 16

Fig.1 Reactive/metal tandem composite liners

Fig.2 Shaped charge

Fig.3 Experimental principle and setup

Fig.4 High-speed photography of reactive/metal tandem EFPs against spaced target plates

Table 1 Experimental results of reactive/metal tandem EFPs against spaced target plates (Condition 1)

Table 2 Experimental results of reactive/metal tandem EFPs against spaced target plates (Condition 2)

Table 3 Experimental results of reactive/metal tandem EFPs against spaced target plates (Condition 3)

Table 4 Parameters of unreacted PTFE/Al

材料	ρ/ (g·cm^-3)	a/ MPa	b/ MPa	n	c	m	T_m/K
PTFE/Al	2.27	8.044	250.6	1.80	0.40	1.00	500

Table 5 Parameters of reacted PTFE/Al

材料	v_D/ (m·s^-1)	P_cj/ GPa	A/ GPa	B/ GPa	R₁	R₂	ω
PTFE/Al	5200	21	15.9	0.0023	7	0.6	0.38

Fig.5 Numerical model of reactive/metal tandem EFPs against spaced target plates

Fig.6 Formation of reactive/metal tandem EFPs

Fig.7 Velocity and density distributions of reactive/metal tandem EFPs at a stand-off of 4CD

Fig.8 Pressure distribution during formation process of reactive/metal tandem EFPs

Fig.9 Numerical results of tandem EFPs penetrating spaced target plates without detonation-like effects of trailing reactive EFP

Fig.10 Numerical results of tandem EFPs penetrating and blasting spaced target plates with detonation-like effects of trailing reactive EFP

Fig.11 Numerical results of tandem EFPs penetrating and blasting spaced target plates with different thicknesses with the detonation-like effects of trailing reactive EFP

References 20

[1]	TOSELLO R, VIVES M, TRONCHE A. Twin EFPs for underwater applications[C]// Proceedings of the 16th International Symposium on Ballistics. San Francisco, CA, US: International Ballistics Society, 1996: 367-378.
[2]	HONG S C, NIU Y M. Numerical simulation of the multiplayer explosively formed projectile[C]// Proceedings of the 15th International Symposium on Ballistic. Jersusalem, Israel: International Ballistics Society, 1995:315-324.
[3]	WEIMAN K, BLACHE A. Explosively formed projectile with tantalum penetration and steel stabilization base[C] // Proceedings of the 18th International Symposium on Ballistics. San Antonio, TX, US: International Ballistics Society, 1999:603-608.
[4]	FONG R, NG W, WERMAN K. Testing and analysis of multi-liner EFP warheads[C]// Proceedings of the 20th International Symposium on Ballistics. Orlando, FL, US: International Ballistics Society, 2002:578-581.
[5]	龙源, 毛振兴, 刘健峰, 等. 曲率半径对双层药型罩EFP战斗部成型及侵彻的影响[J]. 爆破器材, 2016, 45(3):5-10.
	LONG Y, MAO Z X, LIU J F, et al. Influence of curvature radius on the formation and penetration of explosively formed penetrator warhead of the double layer liner[J]. Explosive Materials, 2016, 45(3):5-10. (in Chinese)
[6]	王维占, 李小军, 雷文星, 等. 包覆式双层EFP成型数值模拟[J]. 弹箭与制导学报, 2018, 38(6):103-108.
	WANG W Z, LI X J, LEI W J, et al. Numerical simulation of double-layer cladding EFP molding process[J]. Journal of Projectiles, Rockets, Missiles and Guidance, 2018, 38(6):103-108. (in Chinese)
[7]	MA H B, ZHENG Y F, WANG H F, et al. Formation and impact-induced separation of tandem EFPs[J]. Defence Technology, 2020, 16(3):668-677. doi: 10.1016/j.dt.2019.09.003
[8]	王哲, 蒋建伟, 王树有, 等. 双层药型罩形成的串联爆炸成型弹丸速度计算模型[J]. 兵工学报, 2017, 38(7):1301-1306. doi: 10.3969/j.issn.1000-1093.2017.07.007
	WANG Z, JIANG J W, WANG S Y, et al. A calculation model of velocity of tandem EFP with double layer liners[J]. Acta Armamentarii, 2017, 38(7):1301-1306. (in Chinese) doi: 10.3969/j.issn.1000-1093.2017.07.007
[9]	韩伟, 何勇, 沈晓军, 等. 锆钽复合药型罩EFP成型及侵彻研究[J]. 兵器装备工程学报, 2019, 40(4):163-173.
	HAN W, HE Y, SHEN X J, et al. Investigation of EFP forming and penetration of Ta/Zr double-layered shaped charge liner[J]. Journal of Ordnance Equipment Engineering, 2019, 40(4):163-173. (in Chinese)
[10]	黄松, 尹建平, 张斐, 等. 多层串联EFP成型及侵彻对比分析研究[J]. 火工品, 2018(5):25-28.
	HUANG S, YIN J P, ZHANG F, et al. Comparative analysis on shaping and penetration of the multi-layer EFP[J]. Initiators & Pyrotechnics, 2018(5):25-28. (in Chinese)
[11]	卢冠成, 曹康, 耿宝群, 等. 活性破片爆裂毁伤后效快速图像识别方法[C]// 第十二届全国爆炸力学学术会议缩编文集. 桐乡: 中国力学学会, 2018.
	LU G C, CAO K, GENG B Q, et al. Rapid image recognition of rupturing damage to plates impacted by reactive fragment[C]// Proceedings ot the 12th National Conference on Explosion Mechanics. Tongxiang: The Chinese Society of The Chinese Society of Theoretical and Applied Mechanics, 2018. (in Chinese)
[12]	ZHENG Y F, SU C H, GUO H G, et al. Behind-target rupturing effects of sandwich-like plates by reactive liner shaped charge jet[J]. Propellants Explosives, Pyrotechnics, 2019, 44:1400-1409. doi: 10.1002/prep.v44.11 URL
[13]	GUO J, ZHANG Q M, ZHANG L S, et al. Reaction behavior of Polytetrafluoroethylene-Al granular composites subjected to planar shock wave[J]. Propellants, Explosives, Pyrotechnics, 2017, 42(3): 300-307. doi: 10.1002/prep.v42.3 URL
[14]	武强, 龚自正, 张庆明, 等. 含能活性材料防护结构超高速撞击特性数值模拟研究[J]. 振动与冲击, 2021, 40(11):202-210.
	WU Q, GONG Z Z, ZHANG Q M, et al. Numerical simulation of hypervelocity impact characteristics of energetic active material protective structure[J]. Journal of Vibration and Shock, 2021, 40(11): 202-210. (in Chinese)
[15]	AMES R G. Energy release characteristics of impact-initiated energetic materials[J]. MRS Online Proceedings Library, 2005, 896:308.
[16]	ZHENG Y F, SU C H, GUO H G, et al. Chain damage effects of multi-spaced plates by reactive jet impact[J]. Defence Technology, 2021, 17(2): 393-404. doi: 10.1016/j.dt.2020.02.008
[17]	GUO H G, ZHENG Y F, YU Q B, et al. Penetration behavior of reactive liner shaped charge jet impacting steel plates[J]. International Journal of Impact Engineering, 2019, 126: 76-84. doi: 10.1016/j.ijimpeng.2018.12.005 URL
[18]	郭焕果, 卢冠成, 何锁, 等. 活性复合罩聚能装药侵彻增强行为[J]. 北京理工大学学报, 2020, 40(12): 1259-1266.
	GUO H G, LU G C, HE S, et al. Penetration enhancement behavior of reactive material double-layered liner shaped charge[J]. Transactions of Beijing Institute of Technology, 2020, 40(12): 1259-1266. (in Chinese)
[19]	REN S Y, ZHANG Q M, WU Q, et al. A reactive material double-bumper shield for centimeter sized projectile[J]. International Journal of Impact Engineering, 2021, 158:1-10.
[20]	郑元枫, 马红兵, 肖艳文, 等. 三层串联EFP成型与分离行为[J]. 北京理工大学学报, 2021, 41(2):143-150.
	ZHENG Y F, MA H B, XIAO Y W, et al. Formation and separation behavior of the triple-layer EFP[J]. Transactions of Beijing Institute of Technology, 2021, 41(2):143-150. (in Chinese)