Simulation on Detonation Transfer/Explosion Interruption Performance of Flyer-type Fuze Micro-explosive Train

doi:10.12382/bgxb.2024.0511

Abstract

Abstract:

The size of micro-charge (copper azide) and the thickness of metal flyer are the key factors affecting the reliability of fuze micro-explosive train. A detonation transfer/explosion-proof energy transfer/suppression model of metal flyer micro-explosive train driven by micro-charge is constructed, and a design method for micro-explosive train with size boundaries, such as micro-charge size and metal flyer thickness, is proposed. The research results indicate that the speed of metal flyer(2200m/s) increases slowly when the diameter of micro-charge is greater than 0.8mm. When the height of micro-charge is greater than 0.5mm, the metal flyer moves at a stable speed, which can reliably detonate the next charge. When the size of micro-charge is constant, the speed of metal flyer decreases with the increase of its thickness. The thickness of the flyer increases from 25μm to 50μm, which can realize the reliable detonation of micro-explosive train. Through the simulation analysis of explosion-proof slider thickness of MEMS fuze security mechanism, it is verified that the 0.2mm-thick nickel-based slider can stably realize the explosion interruption, and the detonation transfer/explosion interruption design boundaries of flyer-type fuze micro-explosive train are finally formed.

Key words: fuze, micro-explosive train, flyer, detonation transfer, explosion interruption

CLC Number:

TJ430

KAN Wenxing, FENG Hengzhen, LOU Wenzhong, TIAN Zhongwang, FAN Chenyang, SHI Yonghui. Simulation on Detonation Transfer/Explosion Interruption Performance of Flyer-type Fuze Micro-explosive Train[J]. Acta Armamentarii, 2024, 45(S1): 10-19.

Figures/Tables 22

Fig.1 Simulation model of copper azide-driven flyer

Table 1 Copper azide simulation parameters[22]

ρ_CA/ (kg·m^-3)	D_CA/ (m·s^-1)	p_C-J/ GPa	A_CA/ GPa	B_CA/ GPa	R₁	R₂	ω	E_0,CA/ GPa
2290	4700	12.55	410	4.5	4.9	1.3	0.3	8.5

Table 2 Air simulation parameters[23]

ρ_air/(kg·m^-3)	C₀	C₁	C₂	C₃
1.25×10^-3	-1×10^-6	-0.1	0	0
C₄	C₅	C₆	E_0,air/GPa	V₀
0.4	0.4	0	2.5×10^-6	1

Table 3 Material model parameters of titanium flyer

ρ_Ti/(kg·m^-3)	E_Ti/GPa	G_Ti/GPa	PR_Ti	A_Ti/GPa	B_Ti
4510	113.76	43.75	0.3	1.098	1.092
N_Ti	C_Ti	M_Ti	EPOS_Ti/s^-1	D₁
0.93	0.014	1.1	1	0.8

Table 4 Equation of state parameters of titanium flyer

C_Ti,EOS/(m·s^-1)	S_1,Ti	S_2,Ti	S_3,Ti	GANNA0	A_Ti,EOS
4695	4.15	0	0	2.04	0.4

Fig.2 The pressure field nephograms of flyer driven by copper azide detonation at different times

Fig.3 The speed variation curves of flyer under the condition of different charge diameters

Fig.4 The speed variation curves of flyer under different charge heights

Fig.5 The influence of flyer thickness on flyer speed/kinetic energy

Fig.6 Simulation model for detonation transfer performance

Table 5 Material model parameters of HNS-IV

ρ_HNS-IV/(kg·m^-3)	G_HNS-IV/GPa	SIGY_HNS-IV/GPa
1 600	3.54	0.2

Table 6 Equation of state parameters of HNS-IV

A_HNS-IV	B_HNS-IV	XP₁	XP₂	FRER	G_HNS-IV	R_1HNS-IV	R_2HNS-IV	R_3HNS-IV	FMXGR
5.3625	0.2702	5.4	1.8	0.667	4.5×10^-6	331.8	-0.025	1.535×10^-5	1
R₅	R₆	FMXIG	FREQ	GROW₁	EM	AR₁	ES₁	CVP	FMNGR
11.5	1.15	0.08	1.4×10⁶	0	2	0.667	0.667	1×10^-5	0
CVR	EETAL	CCRIT	ENQ	TMP0	GROW2
2.7×10^-5	4	0.2669	0	298	0

Table 7 Design parameters of detonation transfer simulation model

叠氮化铜尺寸/ mm	叠氮化铜驱动飞片冲击起爆HNS-IV	叠氮化铜直接接触起爆HNS-IV
叠氮化铜尺寸/ mm	飞片厚度/μm	装配间隙/μm
ϕ0.8×0.5	25	0
	50	20

Fig.7 The pressure field nephogram of HNS-IV explosive detonated by flyer impact

Fig.8 The pressure field nephogram of HNS-IV explosive directly detonated by copper azide

Table 8 Detonation simulation results

叠氮化铜尺寸/mm	HNS-IV 尺寸/mm	叠氮化铜驱动飞片冲击起爆 HNS-IV		叠氮化铜直接起爆HNS-IV
叠氮化铜尺寸/mm	HNS-IV 尺寸/mm	飞片厚度/μm	是否起爆	装配间隙/μm	是否起爆
ϕ0.8×0.5	ϕ2.5×1.5	25	√	0	√
		50	√	20	×

Fig.9 Explosion-proof performance simulation model

Table 9 Material model parameters of nickel

ρ_Ni/(kg·m^-3)	G_Ni/GPa	A_Ni/GPa	B_Ni	C_Ni
8874	8.55×10¹⁰	0.163	0.648	0.006

Table 10 Equation of state parameters of nickel

C_Ni,EOS/(m·s^-1)	S_1,Ni	GAMAO_Ni
4 602	1.437	1.93

Fig.10 Pressure field nephogram of explosion-proof components after impact

Fig.11 Displacement and pressure variation curves of explosion-proof components at different flyer speeds

Fig.12 Pressure values of explosion-proof components and explosives under 50μm assembly gap

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