扇形复合装药驱动破片定向飞散的数值模拟

凌琦; 何勇; 何源; 周杰

doi:10.11858/gywlxb.2017.05.008

扇形复合装药驱动破片定向飞散的数值模拟

doi: 10.11858/gywlxb.2017.05.008

南京理工大学智能弹药技术国防重点学科实验室，江苏南京 210094

基金项目:

武器装备预先研究项目 403030202

详细信息

作者简介:
凌琦(1990—)，男，博士研究生，主要从事高效毁伤技术研究.E-mail:lingqicn@foxmail.com

通讯作者:
何勇(1964—)，男，教授，主要从事毁伤效应与新概念弹药技术研究.E-mail:yhe1964@mail.njust.edu.cn

中图分类号: TJ410.1
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出版历程
- 收稿日期: 2016-12-22
- 修回日期: 2017-03-06

Numerical Simulation of Directed Scattering of Fragments Driven by Sector-Shaped Double-Layer Charge

ZNDY of Ministerial Key Laboratory, Nanjing University of Science and Technology, Nanjing 210094, China

摘要

摘要: 利用LS-DYNA软件对扇形单一装药和复合装药驱动破片的作用过程进行了数值模拟，得到预制破片的初速及分布规律，并对不同起爆方式和复合装药参数的扇形装药结构破片驱动特性进行了计算分析。结果表明：数值模拟计算值与试验结果吻合较好，相对于单一装药结构，复合装药能使破片飞散更为集中，且破片的总动能提高了12%以上；通过改变起爆方式和复合装药参数，破片的综合毁伤效能可进一步增强。
- 扇形装药 /
- 复合装药 /
- 超压爆轰 /
- 定向战斗部
Abstract: The dynamic processes of the fragments driven by single and double layer charges were numerically simulated using LS-DYNA and the initial velocity and the distribution of the preformed fragments were obtained.The effects of the initiation positions and the explosive parameters of the double-layer charge on the fragment-driven process were calculated and analyzed.The results show that the calculated values are in good agreement with the experimental results.Compared with the single charge, the double layer charge can make the fragments more focused, and the total kinetic energy of the fragments also increases by more than 12%.The comprehensive damage efficiency of the fragments can be further improved by changing the initiation mode and the explosive type of the double layer charge.
- sector-shaped charge /
- double-layer charge /
- overdriven detonation /
- directional warhead

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图 1 试验装置

Figure 1. Configurations of test devices

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图 2 试验布置示意图

Figure 2. Scheme of test set-up

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图 3 试验现场布置照片

Figure 3. Photo of test set-up

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图 4 有限元模型

Figure 4. Finite element models

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图 5 单一及复合装药的爆轰过程

Figure 5. Detonation process of single and double layer charge

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图 6 爆轰压力变化曲线

Figure 6. Detonation pressure of single and double layer charge

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图 7 50 μs时的破片分布(顶视图)

Figure 7. Scattering of fragments at 50 μs (top view)

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图 8 破片在靶板上的分布

Figure 8. Fragment distribution on target

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图 9 破片沿轴向的速度分布

Figure 9. Fragment velocity distribution along axial direction

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图 10 破片沿周向的速度分布

Figure 10. Fragment velocity distribution along circumferential direction

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图 11 破片飞散方位角的定义

Figure 11. Definition of θ

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图 12 两点起爆时的爆轰波形

Figure 12. Detonation waves in two-point detonation

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图 13 两点起爆时的爆轰压力变化曲线

Figure 13. Detonation pressure of single- and double-layer charge with two-point detonation

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图 14 两点起爆时的破片速度分布

Figure 14. Fragment velocity distribution with two-point detonation

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表 1 炸药的材料模型及状态方程参数^[5]

Table 1. Parameters of explosive and equation of state^[5]

Explosive	ρ/(g·cm^-3)	D/(m·s^-1)	p_CJ/(GPa)	A/(GPa)	B/(GPa)	R₁	R₂	ω
Single charge	1.717	7 980	29.5	524.2	7.678	4.2	1.10	0.34
Double layer outer charge	1.700	8 325	30.0	854.5	20.490	4.6	1.35	0.25

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表 2 内层装药材料参数^[13]

Table 2. Material parameters of inner charge^[13]

ρ/(g·cm^-3)	I/(10⁶s^-1)	G₁/(10^-16Pa^-2·s^-1)	G₂/(10^-16Pa^-2·s^-1)	a	b	c	d	e	f	x	y	z
1.717	44	514	0	0.01	0	0.222 2	0.666 7	0	0	4	2	0

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表 3 模型材料参数^[3]

Table 3. Parameters of material model^[3]

Material	Density/ (g·cm^-3)	Shear module/ (GPa)	Yield stress/ (GPa)	Harden module/ (GPa)	Failure plastic strain
Shell	7.85	80.0	0.8	2.0	0.8
Liner	2.79	26.5	0.4	7.4	0.5
Fragment	7.85	80.0

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表 4 破片飞散参数统计

Table 4. Parameters statistics of fragment scattering

Charge type	v/(m/s)	E_k/(kJ)	θ/(°)
Single charge	1 081	87.0	42.6
Double layer charge	1 144	97.5	29.4

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表 5 两点起爆条件下的破片飞散参数

Table 5. Parameters of fragment scattering with two-point detonation

Charge type	v/(m·s^-1)	E_k/(kJ)	θ/(°)
Single charge	1 078	86.2	40.7
Double layer charge	1 139	96.6	25.3

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表 6 复合装药参数

Table 6. Parameters of double-layer charge

Explosive position	Explosive type	ρ/(g·cm^-3)	D/(m·s^-1)	p_CJ/(GPa)
Inner layer	TNT	1.630	6 930	21.0
Outer layer	PBX9502	1.895	7 710	30.2
	Comp.B	1.717	7 980	29.5
	PETN	1.770	8 300	33.5
	8701	1.700	8 325	30.0
	PBX9404	1.840	8 800	37.0

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表 7 复合装药参数对破片飞散的影响

Table 7. Effects of explosive type on fragment scattering

Explosive	v/(m·s^-1)	E_k/(kJ)	θ/(°)
PBX9502-TNT	1 031	83.7	29.8
Comp.B-TNT	1 029	83.6	28.8
PETN-TNT	1 039	84.8	27.2
8701-TNT	1 030	83.5	26.6
PBX9404-TNT	1 048	85.9	24.3

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