Explosion-proof structures and delay detonation control of tandem explosively formed projectile charges
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摘要: 结合串联战斗部的特点，提出了一种两级爆炸成型弹丸(explosively formed projectile, EFP)装药的串联装药结构。利用LS-DYNA有限元软件分析了不同隔爆体及延时起爆对后级EFP成型的影响，进行了不同隔爆结构和延时匹配的串联EFP侵彻45钢靶实验。实验结果表明：优化后的串联EFP装药的侵彻深度，已经达到分2次单级连续侵彻之和的96.7%，后级装药的侵彻能力得到有效提高。Abstract: According to the analysis of the tandem warhead characteristics, we proposed a new tandem shaped charge structure composed of two explosively-formed projectile charges with the same structure.By using the finite element software LS-DYNA, the effect of different explosion-proof bodies and different delay control on the forming process of the postpositive EFP charge were analyzed.Based on the above results, we conducted experiments for tandem EFP penetration with different delay time.The experimental results show that the penetration depth of the optimized tandem EFP charge can reach 96.7 percent of the sum depth that penetrated by a single EFP charge at twice.The penetration ability of the postpositive EFP charge is greatly improved.
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Key words:
- mechanics of explosion /
- explosion-proof body /
- delay control /
- tandem EFP charge /
- LS-DYNA
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图 4 不同隔爆体200 μs时刻后级EFP形态
Figure 4. Shapes of the postpositive EFP charge at 200 μs with different explosion-proof bodies
图 5 开孔深度和直径随起爆延时的变化
Figure 5. Variation of penetration depth and aperture with delay time
图 7 不同隔爆体串联EFP侵彻结果
Figure 7. Penetration results of tandem EFPs with different explosion-proof bodies
图 9 不同起爆延时下串联EFP装药侵彻钢靶实验结果
Figure 9. Tandem EFP charge penetrating steel targets with different delay time
表 1 JH-2炸药计算参数
Table 1. Computational parameters for JH-2
ρ/(g·cm-3) v/(m·s-1) pCJ/GPa A/GPa E0/(J·m-3) B R1 R2 ω 1.70 8 400 30 56.4 10.0 6.801 4.1 1.3 0.36 
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表 2 紫铜和聚氨酯泡沫计算参数
Table 2. Computational parameters for copper liner
ρ/(g·cm-3) C/(m·s-1) S1 S2 S3 γ0 a E0 8.96 4 750 3.8 2.74 0.125 1.346 0.34 0.0
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表 3 聚氨酯泡沫计算参数
Table 3. Computational parameters for polyurethane foam
ρ/(g·cm-3) C/(m·s-1) S1 S2 S3 γ0 a E0 0.05 886 0.78 0.0 0.0 1.55 0.00 0.0
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表 4 EFP侵彻钢靶数值模拟与实验数据
Table 4. Simulational and experimental results of EFP penetrating steel targets
H/mm h/D d/D 模拟值 实验值 模拟值 实验值 150 0.73 0.74 0.557 0.563 180 0.80 0.78 0.525 0.530 210 0.85 0.86 0.498 0.495 240 0.89 0.88 0.477 0.472 270 0.90 0.89 0.460 0.454 300 0.90 0.90 0.455 0.451
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表 5 串联EFP装药侵彻数值模拟结果
Table 5. Simulation results of tandem EFP penetration
Δt/μs h/mm h/D d/mm d/D 0 92 1.415 22.2 0.341 10 103 1.584 21.6 0.332 20 115 1.769 21.4 0.329 25 104 1.600 21.7 0.327 30 98 1.507 21.3 0.334
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表 6 串联EFP装药侵彻钢靶实验结果
Table 6. Experimental results of tandem EFPs penetrating steel targets
隔爆结构 h/mm d/mm 圆柱形 82 15.2 锥口向上 60 16.6 锥口向下 98 16.3
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表 7 串联EFP装药侵彻钢靶结果
Table 7. Experimental results of tandem EFPs penetrating steel targets
编号 Δt/μs h/mm d/mm A1 0 94 21.4 A2 0 95 21.3 A3 10 105 21.0 A4 10 102 21.2 A5 20 117 20.6 A6 20 115 20.8 A7 25 107 20.4 A8 25 108 20.3 A9 30 100 20.3 A10 30 102 20.2 B1 121 21.6 B2 119 21.8
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