起爆方式对环向聚能射流成型影响的数值模拟

陈伟; 马宏昊; 沈兆武; 薛冰

doi:10.11858/gywlxb.2015.06.003

起爆方式对环向聚能射流成型影响的数值模拟

doi: 10.11858/gywlxb.2015.06.003

中国科学技术大学近代力学系，安徽合肥 230027

基金项目: 国家自然科学基金(51134012，51174183, 51374189)

详细信息

作者简介:
陈伟(1988—), 男, 博士, 主要从事现代爆炸技术与安全工程研究.E-mail:chwei@mail.ustc.edu.cn

通讯作者:
马宏昊(1980—), 男，博士，副教授，主要从事爆破器材与安全工程研究.E-mail: hhma@ustc.edu.cn

中图分类号: O358
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出版历程
- 收稿日期: 2014-09-23

Numerical Simulation of Influence of Different Modes of Initiation on the Forming of Radial Shaped Jet

Department of Modern Mechanics, University of Science and Technology of China, Hefei 230027, China

摘要

摘要: 采用LS-DYNA有限元分析软件, 对环向聚能装药在中心点起爆、端点起爆和两端对称起爆方式下的射流形成过程分别进行了数值模拟。计算结果表明：3种起爆方式下，两端对称起爆的射流头部速度最高，中心点起爆次之，端点起爆最小。起爆方式的不同, 导致爆轰波阵面与药型罩母线的夹角不同；而夹角越小，罩微元受到的爆轰载荷越大，相应的压垮速度越高，形成的射流头部速度越大。在端点起爆的情况下，由于爆轰波形关于药型罩不对称，导致两侧罩微元的爆轰载荷和压垮速度不同，射流发生偏移。
- 环向聚能射流 /
- 数值模拟 /
- 起爆方式 /
- 聚能罩
Abstract: The formation processes of the radial shaped charge jet with different modes of initiation—center-point initiation, endpoint initiation and two-side symmetric initiation—were simulated using LS-DYNA finite element code.Our calculated results show that, comparatively speaking, the head velocity of the jet produced by two-side symmetric initiation is the highest, and that by center-point initiation takes the second place, while that by endpoint initiation is the lowest.Different initiation modes result in different angles between the detonation wave and the generatrix of the outside liner, and the smaller the angle, the higher the detontion load and collapse velocity, and the better the jet performaces.Meanwhile, under the circumstances of endpoint initiation, the detonation load and collapse velocity of the liner elements of both sides are different due to the liner asymmetry of detonation wave, which results in jet offset.
- radial shaped jet /
- numerical simulation /
- modes of initiation /
- shaped charge liner

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图 1 药型罩的压垮过程

Figure 1. Geometry of the collapse conical liner process

下载: 全尺寸图片幻灯片

图 2 环向聚能装药结构示意图

Figure 2. Schematic of radial shaped charge

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图 3 不同起爆方式下环向聚能射流的形成过程

Figure 3. Formation process of radial shaped jet with different modes of initiation

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图 4 与聚能罩交界面对称的A、B炸药单元的位置及压力时程曲线

Figure 4. Locations and pressure-time curves of A and B symmetric elements of explosive on the boundary of the explosive-liner interface

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图 5 不同起爆方式下爆轰波阵面与药型罩母线夹角示意图

Figure 5. Diagram of the angle between detonation wave and generatrix of outside liner with different modes of initiation

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表 1 RDX炸药的JWL状态方程参数^[18]

Table 1. JWL equation of state parameters for RDX^[18]

Explosive	A/(GPa)	B/(GPa)	R₁	R₂	ω	(ρ₀e)/(GPa)
RDX	581.4	6.8	4.1	1.0	0.35	9.0

下载: 导出CSV

表 2 紫铜的Mie-Grüneisen状态方程参数^[18]

Table 2. Mie-Grüneisen equation of state parameters for copper^[18]

Material	c/(m/s)	S₁	S₂	S₃	γ₀	a
Copper	3 940	1.49	0.0	0.0	2.02	0.47

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表 3 起爆后10.0 μs时，3种不同起爆方式所对应的射流速度

Table 3. Velocity of jet at 10.0 μs after initiation with 3 different modes of initiation

Modes of Initiation	Head velocity of jet/(m/s)	Slug velocity/(m/s)
Center-point initiation	1 980	387
Endpoint initiation	1 862	380
Two-side symmetric initiation	2 225	392

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