Numerical Simulation of the Interference of Double-layer Wedge-Charge ERA on Shaped Jet
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摘要: 在现有双层平板装药结构爆炸反应装甲(ERA)的基础上，设计了4种双层楔形装药ERA，利用模拟仿真软件LS-DYNA 3D对其干扰射流的能力进行评估，分别对侵彻过程中平板运动状态、射流头部的速度变化及偏转程度、杵体断裂情况、侵彻靶板的深度及分布等进行分析，以选出最优方案。对比发现：方案3聚能射流速度下降最快，侵彻深度最浅且分布均匀，拥有最好的防护性能；方案4次之；方案1较方案4差些；方案2最差。且方案3和方案4中出现类似于爆炸焊接原理形成的复合飞板层。合理使用楔形装药可以使射流切割更加均匀，增强坦克的防护性能，为以后在装药结构上的探索提供了理论依据。Abstract: Based on the existing double-layer flat-charge explosive reactive armor (ERA), we designed 4 different structures of double-layered wedge-charge ERA, and employed the LSDYNA-3D software to evaluate their ability of interfering with the jet.We analyzed the motion state of flying-plates, the velocity and deflection of the jet head, the slug fracture, the depth of penetration, and the jet distribution in the target to select the optimal solution.The comparison shows that Scheme 3 has the fastest jet velocity reduction rate with the smallest and evenly distributed penetration depth.It can be seen that Scheme 3 has the best protection performance, followed by Scheme 4, Scheme 1 and Scheme 2 in sequence.In Scheme 3 and Scheme 4, a composite flying-plate layer similar to the explosion welding principle has been observed.Through the simulation study of the double-layer wedge-charge ERA, it is found that the reasonable use of the wedge-shaped charge can make the jet cutting more uniformly and enhance the protective performance of tanks, which provides a theoretical basis for future research on the charge structure.
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Key words:
- wedge-shaped charge /
- explosive reactive armor /
- shaped charge /
- LS-DYNA
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图 1 设计模型(左)及有限元模型(右)示意
Figure 1. Schematic of model (Left) and its finite element model (Right)
图 3 各方案不同时刻飞板和射流运行形态
Figure 3. Pattern diagrams of flying-plate of each scheme at different times
图 4 射流接触ERA临界时刻形态
Figure 4. Pattern diagram of the critical moment of jet contacting ERA
图 5 各方案射流头部断裂临界时刻形态图
Figure 5. Critical moment patterns of jet head fracture in each scheme
表 1 双层ERA设定数据
Table 1. Data setting of double-layer ERA
Scheme No. Charge type 1st ERA 2nd ERA a/mm b/mm a/mm b/mm 1 Wedge-shaped 5 3 5 3 2 Wedge-shaped 3 5 3 5 3 Wedge-shaped 5 3 3 5 4 Wedge-shaped 3 5 5 3 5 Sandwich 4 4 4 4 
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表 2 铜、钢材料模型及状态方程参数
Table 2. Parameters of material model and equation of state for copper and steel
Material ρ/(g·cm-3) G/GPa AJ-C/GPa BJ-C/GPa S1 S2 C/(m·s-1) V0 Copper 8.96 46 0.09 0.92 1.489 0 3 940 1 Steel 7.785 77.5 0.175 0.376 1.49 0 4 570 1
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表 3 B炸药材料模型及状态方程参数
Table 3. Parameters of material model and equation of state for explosive B
ρ/(g·cm-3) pCJ/GPa D/(m·s-1) AJWL BJWL RJWL, 1 RJWL, 2 E0 1.717 29.5 7 980 524.2 7.678 4.2 1.1 0.085
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表 4 夹层炸药PBX9502材料模型及状态方程参数
Table 4. Parameters of material model and equation of state for explosive PBX9502
ρ/(g·cm-3) G/GPa σY/GPa A/GPa B/GPa R1 1.712 3.54 0.2 524.2 7.678 778.1 R2 R3 R5 R6 cp/(J·kg-1·K-1) cR/(J·kg-1·K-1) -0.050 31 2.223×10-5 11.3 1.13 10-3 2.487×10-3 GROW2 AR2 ES1 ES2 EN 300 1 0.222 0.333 2.0
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