Design and Forming Performance of Eccentric Liner in D-shaped Charge

doi:10.12382/bgxb.2022.0781

Abstract

Abstract:

In order to solve the problem of poor closure of liner mouth at the edge in the integrated multiple explosively formed projectile (MEFP) warhead, an eccentric liner with different wall thickness along the circumferential direction is designed. The liner is applied to a D-shaped charge structure warhead. The effects of the thick-side orientation and eccentricity of liner on liner forming are studied through theoretical analysis and numerical simulation. The soft recovery experiment of explosively formedprojectile(EFP) was carried out. The results show that the thick-side orientation and eccentricity of eccentric liner have little effect on the velocity of EFP in each direction, but have a great influence on the EFP forming effect. The forming effect is best when the thick-side of liner is oriented to the center of the warhead. The size of eccentricity can adjust the speed difference of the micro element around the liner to the center, and improve the wrapping situation of liner mouth. And the test result of EFP is in good agreement with the simulated result. The eccentric liner can optimize the formation of EFP under oblique detonation by adjusting the matching relationship between the thickness of liner and detonation intensity. It can effectively solve the problem of poor shape of liner when the MEFP warhead with D-shaped charge structure is located at the edge. It provides reference for the structure design of liner at the edge of the integrated MEFP warhead.

Key words: multiple explosively formed projectile, eccentric liner, offset distance, explosively formed projectile soft recovery

CLC Number:

TJ410.3

GAO Peng, WANG Fang, WANG Cong, NIU Wenyu. Design and Forming Performance of Eccentric Liner in D-shaped Charge[J]. Acta Armamentarii, 2024, 45(3): 720-730.

Figures/Tables 24

Fig.1 Forming result of EFP in Ref.[13]

Fig.2 Warhead structure in Ref.[16]

Table 1 Formed shapes of EFPs after optimizing the liners in Ref.[16]

Fig.3 Schematic diagram of the action of the liner’s microelement

Fig.4 Schematic diagram of the action of the liner’s microelement under eccentric initiation

Fig.5 Schematic diagram of the convergence of the microelements of liner under eccentric initiation

Fig.6 The structure of liner in Ref.[18]

Fig.7 Sectional view of eccentric liner

Fig.8 Schematic diagram of warhead structure

Fig.9 Structure diagram of eccentric liner

Fig.10 Schematic diagram of liners arrangement

Table 2 Propagation of detonation wave in D-shaped charge

Fig.11 EFP forming comparison

Table 3 EFP velocity statistics in different orientations

EFP速度	位置A	位置B	位置C
v_x/(m·s^-1)	84	80	94
v_y/(m·s^-1)	1721	1723	1717
v_z/(m·s^-1)	36	41	46

Fig.12 Orientation of eccentric liners

Table 4 Statistical table of eccentricity of different groups

序号	1	2	3	4	5	6
偏心距l₀/mm	0	0.3	0.6	0.9	1.2	1.5

Table 5 Forming results of liners with different eccentricities

Fig.13 Velocity difference between two micro-elements of the liner with different eccentricities

Table 6 EFP velocity statistics under different eccentricitiesm/s

偏心距/mm	2号药型罩	3号药型罩	4号药型罩
0	1 980	1 794	1 721
0.3	1 970	1 736	1 712
0.6	1 975	1 744	1 719
0.9	1 977	1 743	1 719
1.2	1 976	1 741	1 715
1.5	1 974	1 744	1 714

Table 7 Comparison of simulated results

Fig.14 Arrangement of recovery device

Table 8 Theoretically calculated velocity attenuation of EFP in recycled media

介质	密度/(kg·m^-3)	长度/m	存速/(m·s^-1)
空气(到回收介质前)	1.29	3.0	1773
聚苯乙烯颗粒	32	3.9	1089
自然堆积珍珠岩粉	90	1.3	689
踩实珍珠岩粉	120	1.3	375
纤维板	770	1.7	0

Fig.15 The result diagram of EFP forming

Fig.16 Comparison between experimental (left) and simulatedi results (right)

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