Effect of Impact Point Position on V-Shaped Reactive Armor Disturbing Jet
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摘要: 为了研究V形反应装甲中线上不同弹着点位置对射流干扰的影响，利用三维有限元程序(LS-DYNA)对V形反应装甲靶板的射流侵彻过程进行模拟，并通过实验进行对比分析。结果表明，数值模拟结果与实验结果符合较好。弹着点不同时，V形反应装甲靶板对射流的干扰效果有明显差别，并且随着弹着点与底端距离的增大，射流在后效靶板上的侵彻深度呈先减小后增大的趋势；当弹着点距顶端6.25倍射流直径时，射流在后效靶板上的侵彻深度最小，该点的防护能力最优；顶端的防护能力优于底端。Abstract: In this work we simulated the process of the jet penetrating into a target with a V-shaped reactive armor using the three dimensional finite element code (LS-DYNA), and performed the corresponding experiment to study the effect of the impact point position on the jet.The numerical simulation results are in good agreement with the experimental data.The results show that the disturbance degree of the jet was obviously different when the impact point was positioned differently.With the increase of the distance between the impact point and the bottom in the center line of the V-shaped reactive armor, the penetration depth of the jet in the witness target exhibits a tendency to decrease first and then increase.When the distance between the impact point and the top of the V-shaped reactive armor is 6.25 times that of the jet diameter, the penetration depth is minimum and the protective capability at this point is optimal.Moreover, the protective capability of the top is superior to that of the bottom.
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Key words:
- V-shaped reactive armor /
- center line /
- impact point /
- jet
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图 5 上层反应装甲对射流的干扰(t=92 μs)
Figure 5. Disturbance of upper reactive armor to jet (t=92 μs)
图 6 下层反应装甲对射流的干扰(t=140 μs)
Figure 6. Disturbance of lower reactive armor to jet (t=140 μs)
图 7 不同弹着点处射流中后部速度剖面(t=140 μs)
Figure 7. Velocity profiles of the middle and rear of the jet at different impact points (t=140 μs)
表 1 紫铜和603钢的材料参数
Table 1. Material parameters of copper and 603 steel
Material ρ/(g·cm-3) E0/GPa μ AJ-C/MPa BJ-C/MPa CJ-C n m Copper 8.96 124 0.34 100 300 0.025 0.31 1.09 603 steel 7.80 210 0.22 792 180 0.016 0.12 1.00 
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表 2 主装药的材料参数
Table 2. Parameters of main explosive
ρ/(g·cm-3) AJWL/GPa BJWL/GPa R1 R2 ω v/(km·s-1) 1.72 374 3.3 4.5 0.95 0.3 8.93
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表 3 夹层炸药的材料参数
Table 3. Parameters of confined-explosive
ρ/(g·cm-3) pCJ/GPa I/μs-1 G1/(μs·GPa-1) v/(km·s-1) a b c λig, max/(m·s-1) λG1, max/(m·s-1) λG2, max/(m·s-1) G2/(μs·GPa-1) d g y z 1.72 27 4.4×1011 310 6.93 0 0.667 0.667 0.3 0.5 0 4.0×104 0.111 1.0 1.0 2.0
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表 4 弹着点不同时射流的侵彻深度
Table 4. Penetration depth of jet at different impact points
Impact point Penetration depth/mm Exp. Sim. F 16.2 17.5 G 39.5 35.6 H 44.4 A 50.0 B 47.5 44.0 C 44.8 40.4 D 38.1 O 30.6 32.4 E 25.3
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