Structural Design and Experiment of 1kg TNT Equivalent Double-layer Asymmetric Explosion Protection Device

doi:10.12382/bgxb.2025.0478

Abstract

Abstract:

To study the energy release characteristics of energetic materials after excitation and ensure the safety of the test, a double-layer asymmetric cylindrical explosion protection device is designed with capability of containing 1kg TNT equivalent detonation. Through the structural design, simulation analysis using LS-DYNA finite element software, and full-equivalent detonation dynamic response test with 1kg TNT, the safety of the explosion protection device is evaluated by comparing the theoretical predictions, experimental data and simulated results. Simulated and experimental results demonstrate that the structural design of the double-layer asymmetric cylindrical explosion protection device is reasonable with a sufficient safety margin. In the full-scale 1kg TNT detonation test, the stress corresponding to the measured outer wall strain at typical positions is lower than the yield strength of shell material of the protection device. The peak reflective overpressure measured on the inner l at typical positions is within the range calculated by the empirical formulas. The explosion resistance strength of the protection device meets the test requirements. The design, analysis, and experimental methods in this paper can provide useful references for the design and verification of similar explosion protection devices.

Key words: double-layer asymmetry, explosion protection device, dynamic response, dynamical coefficient

ZHAO Shengwei, ZHOU Gang, SUN Hao, CHEN Baihan, LI Ming. Structural Design and Experiment of 1kg TNT Equivalent Double-layer Asymmetric Explosion Protection Device[J]. Acta Armamentarii, 2025, 46(10): 250478-.

Figures/Tables 21

References 36

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材料属性	Q345R	S30408
弹性模量/GPa	209	170
抗拉强度σ_b/MPa	500	520
屈服强度σ_s /MPa	325	230
许用应力/MPa	185	153
伸长率/%	25	45

材料属性	Q345R	S30408
弹性模量/GPa	209	170
抗拉强度σ_b/MPa	500	520
屈服强度σ_s /MPa	325	230
许用应力/MPa	185	153
伸长率/%	25	45

	*MAT_PLASTIC_KINEMATIC
容器	R₀		E		PR				SIGY			ETAN
	7600		20700		0.3				265			880
	*MAT_HIGH_EXPLOSIVE_BURN
TNT	R₀			D			PCJ				BETA
	1630			6.929			2100				0.0
	*EOS_JWL
	A	B		R₁		R₂		OMEG		E₀			V₀
	37100	3230		4.15		0.95		0.3		7000			1.0
	*MAT_NULL
空气	R₀		PC		MU				YM			PR
	1.2929		0.0		0.0				0.0			0.0
	*EOS_LINEAR_POLYNOMIAL
	C₀	C₁		C₂		C₃		C₄		E₀			V₀
	0	0		0		0		0.4		2.5			1.0

	*MAT_PLASTIC_KINEMATIC
容器	R₀		E		PR				SIGY			ETAN
	7600		20700		0.3				265			880
	*MAT_HIGH_EXPLOSIVE_BURN
TNT	R₀			D			PCJ				BETA
	1630			6.929			2100				0.0
	*EOS_JWL
	A	B		R₁		R₂		OMEG		E₀			V₀
	37100	3230		4.15		0.95		0.3		7000			1.0
	*MAT_NULL
空气	R₀		PC		MU				YM			PR
	1.2929		0.0		0.0				0.0			0.0
	*EOS_LINEAR_POLYNOMIAL
	C₀	C₁		C₂		C₃		C₄		E₀			V₀
	0	0		0		0		0.4		2.5			1.0

网格尺寸/mm	入射超压/MPa	反射超压/MPa
16	1.23	4.77
12	1.26	4.95
10	1.31	5
8	1.32	5.3