Effect of Delay Time on Formation and Penetration of Tandem EFP
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摘要: 为了解决在大块度障碍物上快速开孔且孔深和孔径符合要求的难题,提出了一种前、后两级均为爆炸成型弹丸(EFP)装药的新型串联聚能装药结构。利用LS-DYNA3D有限元软件,对串联EFP装药的成型过程进行了数值仿真,分析了两级装药延时起爆对后级EFP成型的影响,并在此基础上开展了串联EFP装药侵彻45钢靶实验。结果表明:该串联EFP装药结构可充分发挥前、后两级EFP的侵彻能力,提高了侵彻效果。Abstract: In order to solve the problem about fast perforation of hunk fraise with enough depth and width, a new tandem shaped charge structure is proposed, which is composed of two same structure of EFP (explosively formed projectile) shaped charge.Using finite element software LS-DYNA3D, the forming process of this new structure and the effect of delay time on the forming process of tandem EFP are simulated and analyzed.On this basis, an experiment for tandem EFP penetrating 45 steel target is conducted.The results show that the tandem EFP charge can make full use of the penetration capabilities of two shaped charge, and the penetration effect is greatly improved.
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Key words:
- tandem warhead /
- tandem EFP /
- delay control /
- penetration /
- numerical simulation
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表 1 炸药的计算参数
Table 1. Computation parameters of explosive
ρ/(g/cm3) v/(km/s) pCJ/(GPa) E0/(GPa) A/(GPa) B/(GPa) R1 R2 ω 1.70 8.4 30 10.0 56.4 6.801 4.1 1.3 0.36 表 2 紫铜药型罩的计算参数
Table 2. Computation parameters of copper liner
ρ/(g/cm3) C/(km/s) S1 S2 S3 γ0 a E0/(GPa) 8.96 4.75 3.8 2.74 0.125 1.346 0.34 0.0 表 3 不同炸高条件下侵彻深度和穿孔直径的数值模拟结果和实验结果
Table 3. Simulated and experimental results of penetration depth and expanded diameter at various height of burst
H/(mm) P/R d/R Sim. Exp. Sim. Exp. 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 表 4 串联EFP装药侵彻钢靶仿真计算结果
Table 4. Numerical results of tandem EFP charge penetrating the steel target
b/(mm) Δt/(μs) P/(mm) P/D d/(mm) d/D 200 10 91.3 1.41 25.8 0.40 200 20 95.8 1.47 25.2 0.39 200 25 96.7 1.49 25.0 0.38 200 30 94.4 1.45 25.9 0.40 200 40 84.2 1.30 27.7 0.43 表 5 串联EFP装药侵彻钢靶实验结果
Table 5. Experimental data of tandem EFP charge penetrating the steel target
Exp.No. Δt/(μs) P/(mm) P/D d/(mm) d/D A1, A2 108 1.661 20 0.308 B1, B2 10 84 1.292 26 0.400 B3, B4 20 99 1.523 25 0.385 B5, B6 25 102 1.569 23 0.354 B7, B8 30 91 1.400 27 0.415 B9, B10 40 83 1.277 28 0.431 -
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