楔形装药对射流干扰的数值模拟

周杰; 王凤英; 原诗瑶; 吴鹏

doi:10.11858/gywlxb.20170566

楔形装药对射流干扰的数值模拟

doi: 10.11858/gywlxb.20170566

中北大学环境与安全工程学院，山西太原 030051

基金项目:

国家自然科学基金 11572292

详细信息

作者简介:
周杰(1992—), 男，硕士研究生，主要从事武器系统防护研究.E-mail:450426673@qq.com

中图分类号: O389; TJ411
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出版历程
- 收稿日期: 2017-04-17
- 修回日期: 2017-05-08

Numerical Simulation of Interference Effect of Wedge-Shaped Charge on Jet

School of Environmental and Safety Engineering, North University of China, Taiyuan 030051, China

摘要

摘要: 利用ANSYS/LS-DYNA模拟了楔形装药和平板装药对射流的干扰过程，分析了不同楔形角度和装药量对射流的头部速度以及偏转角、杵体速度等数据的影响，并与平板装药的模拟结果对比。结果表明：楔形装甲对射流头部的干扰作用与平板装药相同，但对射流杵体的干扰不同。楔形平板的运动是由板平动和转动组成的二维运动；当楔形角度为正时，楔形装药对射流切割效果较平板装药好，可使射流头部偏转增大，速度减缓，杵体速度减缓，且这种效果随着楔形角度的增加而增加；此外，楔形角度确定后，随着楔形装药量的提高，侵彻位置向楔形上端偏移，接触靶板时间滞后，杵体断裂时间提前，板旋转减弱。
- 楔形装药 /
- 平板装药 /
- 爆炸装甲 /
- ANSYS/LS-DYNA
Abstract: The process of wedge-shaped charge's interference effect and that of sandwich charge's on the jet were numerically simulated using ANSYS/LS-DYNA software.The influence of the wedge angle and that of the charge mass on the velocity and the declination angle of the jet head, the velocity of the slug were analyzed and discussed.Comparison of the obtained results with those of the sandwich charge shows that the interference effects of the wedge-shape charge and the sandwich charge on the jet head are very much alike but their interference effects on the jet slug are different.The movement of the wedge shaped flying-plates can be seen as a 2D composite motion of translation and rotation.When the wedge angle is positive, the cutting jet effect of the wedge-shaped charge is better than that of the sandwich charge.In this case, the deflection of the jet head increases, the velocity of the jet slug decreases, and the effect is enhanced with the increase of the wedge angle.Moreover, as the charge mass increases under the condition that the angle remains unchanged, the contact position of the jet head gradually shifts to the front of the target, the contact time delays, the breakup time of the jet slug arrives earlier, and the rotation of the plates slows down.
- wedge-shaped charge /
- sandwich charge /
- explosive reactive armor (ERA) /
- ANSYS/LS-DYNA

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图 1 楔形装药与传统平板装药

Figure 1. Wedge-shaped charge and sandwich charge

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图 2 数值模拟基本模型

Figure 2. Elementary model of numerical simulation

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图 3 楔形装药(2×6)与平板装药干扰射流过程

Figure 3. Jet disturbing processes of wedge-shaped charge(2×6) and sandwich charge

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图 4 干扰射流过程中平板间夹角(a)及射流径向速度(b)的变化曲线

Figure 4. Angle between two flying-plates (a) and jet velocity in x-axis (b) in the jet disturbing process

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图 5 不同楔形角度下楔形装药对射流的干扰

Figure 5. Jet disturbing effects of wedge-shaped charge with different wedge angles

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图 6 射流断裂瞬间的速度图像

Figure 6. Velocity images in y-axis at the moment of jet breakup

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图 7 楔形装药随装药量变化的曲线

Figure 7. Jet disturbing effects of wedge-shaped charge with different charge mass

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表 1 楔形装药设定数据

Table 1. Experiment data of wedge-shaped charge

No.	Charge type	a/mm	b/mm	θ/(°)	m/g
1	Sandwich	4	4	0	164.16
2	Wedge-shaped	3	5	0.5	164.16
3	Wedge-shaped	5	3	-0.5	164.16
4	Wedge-shaped	2	6	1.0	164.16
5	Wedge-shaped	6	2	-1.0	164.14
6	Wedge-shaped	2	4	0.5	123.12
7	Wedge-shaped	4	6	0.5	205.20

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表 2 材料基本参数

Table 2. Material parameters

Material	ρ/(g·cm^-3)	E/GPa	γ₀	A/MPa	B/MPa	C	n	m
Cu	8.96	47.8	0.90	292	300	0.025	0.310	1.09
Steel	7.85	77.0	1.35	362	180	0.087	0.568	1.00

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表 3 主装药材料基本参数

Table 3. Parameters of main explosive

ρ_e/(g·cm^-3)	A_JWL/MPa	B_JWL/MPa	R₁	R₂	ω	D/(m·s^-1)
1.72	3.74×10⁵	3 300	4.5	0.95	0.3	8 930

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表 4 夹层装药材料基本参数

Table 4. Parameters of confined explosive

p_CJ/GPa	ρ₀/(g·cm^-3)	I/μs^-1	G₁/(μs·GPa^-1)	a	c	y	D/(km·s^-1)	G₂/(μs·GPa^-1)	b	d	z	g	λ_{G2, min}
27	1.717	4.4×10¹¹	310	0	0.667	1.0	6.93	4.0×10⁴	0.667	0.111	2.0	1.0	0

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表 5 不同工况下射流侵彻后效靶板数据

Table 5. Penetration data under different work conditions

No.	t_c/μs	t_b/μs	L_p/mm	θ_f/(°)
1	140	208	20.0	0.66
2	138	196	25.5	25.68
3	147	192	18.0	22.12
4	138	223	28.8	41.66
5	149	225	11.4	41.44
6	133	220	30.2	20.85
7	157	192	14.1	14.98

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