Contact Explosion Resistance of Steel Plates Reinforced with Polyurea Coating

doi:10.12382/bgxb.2023.0090

Abstract

Abstract:

The blast-resistant performances of single-layer steel plates and polyurea-coated steel plates under contact explosion are studied to address the protection requirements of armored vehicles and other weapons. Both experimental and numerical simulation approaches are employed to analyze the damage modes and protection mechanisms of steel plates with different areal densities and polyurea coating positions. The impact of the ratio of polyurea thickness to steel plate thickness on the blast-resistant performance of the composite structure is also explored. The results show that coating the back face of steel plate with constant thickness polyurea can effectively reduce the perforation and tensile failure on its back and decrease the residual displacement, while coating the front face with constant thickness polyurea can significantly enhance the blast resistance of the structure and greatly reduce the damage to the steel plate under contact explosion. Under the condition of the same areal density, the energy absorption performance of polyurea is positively correlated with its thickness, but the excessive thickness of polyurea may cause greater deformation and reduced stability of the composite structure. Taking into account the deformation, velocity attenuation and energy absorption of polyurea-coated steel plates, the study finds that the steel plate with a polyurea layer on the front face at a thickness ratio of 1∶0.78 has the best blast-resistant performance within the scope of the research.

Key words: steel plates, polyurea coating, contact explosion, blast-resistant performance, areal density

CLC Number:

O383

LIU Baohua, XU Wenlong, WANG Cheng, YANG Tonghui, GE Meng. Contact Explosion Resistance of Steel Plates Reinforced with Polyurea Coating[J]. Acta Armamentarii, 2024, 45(5): 1637-1647.

Figures/Tables 20

Fig.1 SD-19 polyurea mechanical properties

Fig.2 Experimental sample of polyurea-coated steel

Fig.3 Polyurea-coated steel plate contact explosion test device

Table 1 Contact explosion test conditions

工况	钢板厚度/mm	聚脲厚度/mm	涂覆位置	面密度/ (kg·m^-2)
1	5	无	无	39.25
2	5	5	背爆面	44.35
3	5	5	迎爆面	44.35
4	10	无	无	78.50

Fig.4 Experimental results of contact explosion of polyurea-coated steel plate

Fig.5 Non-contact explosion experiment of steel plate with 5mm blast distance

Fig.6 1/4 finite element model of polyurea-coated steel plate

Table 2 No.45 steel material parameters[31]

E/ MPa	ρ/ (kg·m^-3)	ν	σ_Y/ MPa	E_T/ MPa	F_s	C/s^-1	P
2.1×10⁵	7850	0.3	355	2000	0.15	1885	2.54

Table 3 Polyurea material parameters

E/MPa	ρ/(kg·m^-3)	ν	σ_Y/MPa	E_T/MPa	FAIL
234.6	1020	0.4	15.7	23.4	0.85

Table 4 TNT’s JWL parameters

A/GPa	B/GPa	R₁	R₂	ω
307	3.898	4.485	0.79	0.3
E/GPa	ρ_e/(kg·m^-3)	D_C-J/(m·s^-1)	p_C-J/GPa
6.9684	1580	6880	19.4

Fig.7 Comparison between numerical simulation and experiment of steel plate explosion pressure

Table 5 Numerically simulated results of contact explosion test conditions

工况	钢板				聚脲开孔/ mm	仿真值与实验值的误差/%
工况	迎爆面开孔/ mm	仿真值与实验值的误差/%	背爆面开孔/ mm	仿真值与实验值的误差/%	聚脲开孔/ mm	仿真值与实验值的误差/%
1	22.30	1.76	17.90	1.70
2	22.10	6.25	15.10	9.42	17.30	1.82
3					23.57	6.09
4

Fig.8 Numerical simulation-experimental comparison of four working conditions

Fig.9 Condition 3 explosion response

Table 6 Isoareal density simulation working condition setting and maximum residual deformation comparison

Fig.10 Z-direction velocity-time curve of maximum displacement point of steel plate

Fig.11 Displacement-time curves of the maximum displacement point of the steel plate under different thickness ratios

Fig.12 Energy absorption-time curves of composite structure F4

Fig.13 Energy absorption-time curves of composite structure F9

Fig.14 Comparison of energy absorptions of steel plate and polyurea under eight different working conditions

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