Numerical Simulation of the Structure of Composite Liner to Enhance After-Effect
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摘要: 针对增强聚能射流的破甲后效问题，设计了等壁平顶锥形铜铝双层复合药型罩装药结构，采用冲击波物理显示欧拉动力学软件SPEED开展复合射流成型及对钢-铝间隔靶侵彻过程的数值模拟，分析内外双层药型罩高度比
$\varepsilon $ 、药型罩锥角$\alpha $ 等参数对复合射流成型和间隔靶侵彻性能的影响规律。研究结果表明：复合射流的头部速度随$\varepsilon $ 增大呈先减小后增加的趋势，在ε约为1/2时，可形成具有相近速度的铜铝同轴复合射流微元，利于铝射流微元与目标相互作用实现后效增强毁伤；且当α在50°～60°范围内时，复合射流中段为集中的铝射流微元，更利于侵彻后的爆炸或爆燃反应。对优化参数的复合药型罩结构数值模拟结果与文献公布的实验结果吻合较好。研究结果对增强后效聚能装药设计具有参考价值。Abstract: To address the problem of the after-effect of the enhanced shaped charge jet penetrating armor, the cone-shaped flat-topped conical copper-aluminum double-layer composite charge structure was designed. Numerical simulation of the jet forming and penetration process of the steel-aluminum interval target with this structure was performed using Euler dynamics software SPEED. And the influence rules of parameters such as the height ratio$\varepsilon $ of the inner and outer liner, the cone angle α of the liner on the compound jet forming and the penetration of the interval target plate were analyzed. The research results show that the head velocity of the compound jet declined first and then rose with the increase of$\varepsilon $ . When$\varepsilon $ =1/2, a coaxial copper and aluminum compound jet element with similar velocity can be formed, which is conductive to strengthening the after-effect after the interaction between the aluminum jet and the target. When$\varepsilon $ is 55°～60°, the middle section of the compound jet is a concentrated aluminum jet element, which is more conducive to the intensified explosive reaction after penetration. It is found that the simulation results of the optimized parameters of the compound liner structure are perfectly consistent with the experimental results published in the literature. This research results have a certain reference value for the enhanced after-effect shaped charge design.-
Key words:
- shaped charge /
- after-effect enhancement /
- jet /
- numerical simulation /
- liner
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图 1 活性复合药型罩聚能装药示意图
Figure 1. Schematic diagram of shaped chargewith active compound liner
图 2 活性复合药型罩聚能装药Euler计算模型
Figure 2. Euler calculation model for shaped charge of active compound charge
图 4 复合射流的头部速度和长度随
$\varepsilon $ 的变化Figure 4. Head velocity and length of the composite jet change with
$\varepsilon $ 
图 5 不同
$\varepsilon $ 对应的射流速度变化曲线Figure 5. Curves of jet velocity with different
$\varepsilon $ 
图 6 不同
$\varepsilon $ 工况下复合射流侵彻的数值模拟结果（t=120 µs）Figure 6. Numerical calculation results of compound jet penetration with different
$\varepsilon $ (t=120 µs)
图 7 α不同时复合射流的头部速度和射流长度变化
Figure 7. Head velocity and length of the composite jet changed with α
图 9 120 μs时射流侵彻靶板的数值模拟结果
Figure 9. Simulation results of jet penetrating into target plates at 120 μs
图 12 活性复合射流增强后效反应过程
Figure 12. After effect reaction process enhanced by the active composite jet
表 1 材料模型
Table 1. Material model
Parts Material Equation of state Strength model Explosive JH-2 JWL Outer liner Al Shock Johnson-Cook Inner liner OFHC Shock Johnson-Cook Target 1 Steel Shock Johnson-Cook Target 2 Al Shock Johnson-Cook 
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$\,\rho $0/(g·cm−3) D/(km·s−1) E0/GPa pCJ/GPa A/GPa B/GPa R1 R2 $\omega $ 1.7 8.40 10.0 30 56.4 6.801 4.1 1.3 0.36
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表 3 罩体及靶板材料参数
Table 3. Material parameters of the liner material and target plate
Material $ \,\rho$/（g·cm−3） a/MPa b/MPa C N m Tm/K OFHC 8.96 90 292 0.025 0.31 1.09 1356 Al 2.70 324 114 0.002 0.42 1.34 925 Steel 7.83 792 510 0.014 0.26 1.03 1793
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表 4 不同工况下复合射流成型过程
Table 4. Composite jet forming process with different working conditions
$\varepsilon $ Time of compound jet forming/μs 0 10 20 40 1/4 
1/3 
1/2 
2/3 
3/4 
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表 5 不同α工况下典型时刻复合射流成型
Table 5. Compound jet forming process with different α
α/（º） Time of compound jet forming/μs
20
4050 
55 
60 
65 
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