Dispersion Characteristics and Rule of Fragments of Linear Focusing Fragment Warhead

doi:10.12382/bgxb.2024.0672

Abstract

Abstract:

Linear focusing fragment warhead makes the fragments disperse at an equal velocity and focus linearly by taking advantage of the design of charge generatrix and fragment arrangement, which can exert structural cutting damage to a target. In order to study the influence of structural parameters of linear focusing fragment warhead on the dispersion characteristics of fragments, the fluid-structure interaction (FSI) algorithm is used to numerically simulated the focusing process of fragments. The numerically simulated results reveal the linear focusing mechanism of linear focusing fragment warhead. The typical linear focusing process includes fragment driving stage, fragment focusing stage, focusing completion stage and fragment dispersion stage. The effects of warhead size, fragment arrangement, fragment mass and intersection velocity on the dispersion and spatial distribution characteristics of fragments are further obtained by numerical simulation. The results show that, with the increase in charge length from 0.3m to 0.5m, the standard deviation of fragment velocity increases from 125m/s to 147m/s, the focusing completion time is 490μs, 585μs and 590μs, respectively, and the width of perforation dense distribution increases from 135mm to 234mm. When the fragment arrangement increases from 15 columns to 18 columns, the standard deviation of fragment velocity increases from 117m/s to 125m/s, the focusing completion time is 470μs and 490μs, respectively, and the width of perforation dense distribution increases from 235mm and 135mm respectively. When the fragment mass increases from 4.08g to 9.21g, the standard deviation of fragment velocity decreases from 137m/s to 125m/s, the focusing completion time is 380μs and 490μs, and the width of perforation dense distribution is 156mm and 135mm, respectively. When the interaction speed increases from 0m/s to 1000m/s, the focusing completion time is 490μs, 480μs and 469μs, respectively, the width of perforation dense distribution increases from 135mm to 138mm, and the density of fragment distribution decreases from 640/m² to 630/m² with a rate of about 2%. The research results can provide guidance and reference for the design of focusing warhead.

Key words: linear focusing fragment warhead, warhead structure parameter, fragment dispersion and focusing behavior, fragment dispersion characteristic

CLC Number:

TJ410

WANG Jin, LIU Yize, ZHANG Hongyu, YAN Yueguang, WANG Haifu, GE Chao. Dispersion Characteristics and Rule of Fragments of Linear Focusing Fragment Warhead[J]. Acta Armamentarii, 2024, 45(S1): 161-173.

Figures/Tables 33

Fig.1 Warhead structure, fragment arrangement and shape of charge[18,21]

Fig.2 FSI numerical simulation model of warhead

Table 1 Parameters of material model of TNT[26]

密度/ g·cm^-3	D_CJ/ (m·s^-1)	P_CJ/ GPa	E₀/ GPa	A/ GPa	B/ GPa	V
1.63	6.9	19.4	6.9	307	3.9	1.0

Table 2 Parameters of material model of air[27]

ρ/ (g·cm^-3)	C/ (m·s^-1)	γ₀	S₁	S₂	S₃
1.25×10^-3	344	1.4	0	0	0

Table 3 Parameters of material model of W[28]

密度/(kg·m^-3)	E/GPa	υ	σ₀/MPa	E_tan/GPa
17600	324	0.303	670	4050

Table 4 Parameters of material model of steel[29]

密度/(kg·m^-3)	E/GPa	υ	σ₀/MPa	E_tan/GPa
7830	210	0.3	355	10

Fig.3 Fragment field of traditional fragment warhead

Fig.4 Fragment field of linear focusing fragment warhead

Fig.5 Fragment dispersion characteristics at different stages

Fig.6 Effect of charge length on fragment velocity distribution

Fig.7 Effect of charge length on standard deviation of fragment velocity distribution

Fig.8 Variation of fragment dispersion angle with time under different charge lengths

Fig.9 Variation of focusing band width with time at different charge lengths

Fig.10 Perforation distribution of linear focusing fragment warhead

Fig.11 Perforation distribution of traditional fragment warheads with different charge lengths

Fig.12 Effect of fragment arrangement on fragment velocity

Fig.13 Effect of fragment arrangement on standard deviation of fragment velocity

Fig.14 Variation of fragment dispersion angle with time ubder different fragment arrangements

Fig.15 Variation of focusing band width with time under different fragment arrangements

Fig.16 Perforation distribution of linear focusing fragment warhead under different fragment arrangements

Fig.17 Perforation distribution of traditional fragment warhead under different fragment arrangements

Fig.18 Effect of fragment mass on velocity distribution

Fig.19 Effect of fragment mass on standard deviation of fragment velocity

Fig.20 Variation of fragment dispersion angle with time under different fragment masses

Fig.21 Variation of focusing band width with time under different fragment masses

Fig.22 Perforation distribution of linear focusing fragment warhead under different fragment masses

Fig.23 Perforation distribution of traditional fragment warhead under different fragment masses

Fig.24 Variation of fragment dispersion angle with time at different interaction speeds

Fig.25 Variation of focusing band width with time at different interaction speeds

Fig.26 Perforation distribution of linear focusing fragment warhead at different interaction speeds

Fig.27 Perforation distribution of traditional fragment warhead at different interaction speeds

Fig.28 Effect of interaction speed on width of perforation distribution

Fig.29 Effect of interaction speed on density of fragments

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