A Prediction Model for Dynamic Penetration of Shaped Charge Jet

doi:10.12382/bgxb.2024.0932

Abstract

Abstract:

In order to study the variation law of the penetration power of shaped charge jet under lateral disturbance,the finite element models of the dynamic penetration of shaped charge jet are established,and the evolutionary process of jet penetration from static to dynamic conditions is analyzed.Based on the virtual origin theory and dimensional analysis method,a virtual source is introduced to characterize the jet in the dimensional analytical model.An engineering prediction model for dynamic jet penetration depth,which considers lateral disturbance,jet and target plate strength,is established.A jet dynamic penetration test based on a rocket sled is designed and conducted,and the numerical simulation and prediction models are validated.The research results indicate that the dynamic penetration depth of shaped charge jet decreases exponentially with the increase in the lateral disturbance of target plates.The numerically simulated results,prediction model,and experimental results are in good agreement with each other,and both the prediction model and numerical simulation have a certain degree of accuracy and effectiveness.The proposed prediction model can describe the influence of lateral disturbance on the penetration power of shaped charge jet,thus providing a basis and reference for evaluating the dynamic damage power of formed charges.

Key words: shaped charge, virtual origin, dimensional analysis, dynamic test, finite element simulation

CLC Number:

TJ301

WANG Yizhen, YIN Jianping, ZHANG Xuepeng, YI Jianya, LI Xudong. A Prediction Model for Dynamic Penetration of Shaped Charge Jet[J]. Acta Armamentarii, 2025, 46(6): 240932-.

Figures/Tables 16

Fig.1 Simplified model of shaped charge

Fig.2 Numerical simulation model of jet dynamic penetration

Table 1 Material parameters of copper liner

ρ/(kg·m³)	A/GPa	B/GPa	C	N	M
8960	0.09	0.290	0.025	0.31	1.09

Table 2 Material parameters of 8701 explosive

参数	数值	参数	数值
ρ_e/(kg·m^-3)	1717	R₁	4.2
D/(m·s^-1)	8320	R₂	1.1
p_C-J	0.37	E₀	0.102
α/GPa	524.23	ω	0.34
β/GPa	7.68

Tab.3 Chemical composition of 30CrMnMoRE

材料	比例/%	材料	比例/%
碳C	0.26	钼Mo	0.60
硅Si	0.30	铬Cr	0.80
锰Mn	1.05	铼Re	0.07

Table 4 Material parameters of shell, wave shaper and target plate

材料	ρ_ξ/(kg·m^-3)	E/GPa	ν	σ_Y/GPa	β
2024-T3铝合金	2 780	72.4	0.33	0.345	0.5
酚醛树脂	1130	0.35	0.36	0.12	1
30CrMnMoRE	7830	202.8	0.3	0.975	1

Fig.3 Jet static penetration test

Fig.4 Results of jet static penetration test

Fig.5 Numerical simulation of jet static penetration

Fig.6 Typical dynamic penetration depths of jets

Fig.7 The relationship between Lmd/S and vt

Fig.8 Jet dynamic penetration depth and prediction curve

Fig.9 Schematic diagram of jet dynamic penetration test

Fig.10 Records of jet dynamic penetration test results

Fig.11 Dynamic test results at different relative speeds

Fig.12 Comparison of jet dynamic penetration results

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