Strengthening Effect of Polyurea on Multi-layer Blast-resistant Structure Subjected to Combined Action of Shock Wave and Fragments

doi:10.12382/bgxb.2024.0798

Abstract

Abstract:

In order to investigate the effect of polyurea coating on the protective performance of blast-resistant structure,a multi-layer blast-resistant structure reinforced with polyurea is proposed,and the protective characteristics of blast-resistant structure under the actions of shock wave and fragments are analyzed.The overpressure fitting formula of explosive is calculated and obtained,and out-of-plane displacement of blast-resistant structure is measured using a laser 3D scanner.Experimental results of overpressure and displacement are in good agreement with simulated results.Research results show that the position of polyurea coating has great effects on the protective ability of blast-resistant structure.The protective effect of coating located on blast-facing side of sandwich steel plate is better than those of coating located on the back-blast sides of face plate and sandwich steel plate.It can effectively reduce the penetration rate and impact number of fragments,weaken the energy of the combined load ultimately acting on the back plate,and reduce the vibration amplitude and acceleration at the center of back plate.This study can provide a reference for the design of multi-layer blast-resistant structure.

Key words: shock wave, fragment, combined load, blast-resistant structure, polyurea

MA Dong, WANG Cheng, SHAO Nan, WEI Jianshu. Strengthening Effect of Polyurea on Multi-layer Blast-resistant Structure Subjected to Combined Action of Shock Wave and Fragments[J]. Acta Armamentarii, 2025, 46(7): 240798-.

Figures/Tables 21

References 29

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样品编号	结构(从迎爆面到背爆面)
S-4	0.5mm钢板/30mm泡沫铝/0.5mm钢板/50mm岩棉/1mm钢板
S-5	0.5mm钢板/3mm聚脲/30mm泡沫铝/0.5mm钢板/50mm岩棉/1mm钢板
S-6	0.5mm钢板/30mm泡沫铝/3mm聚脲/0.5mm钢板/50mm岩棉/1mm钢板
S-7	0.5mm钢板/30mm泡沫铝/0.5mm钢板/3mm聚脲/50mm岩棉/1mm钢板

样品编号	结构(从迎爆面到背爆面)
S-4	0.5mm钢板/30mm泡沫铝/0.5mm钢板/50mm岩棉/1mm钢板
S-5	0.5mm钢板/3mm聚脲/30mm泡沫铝/0.5mm钢板/50mm岩棉/1mm钢板
S-6	0.5mm钢板/30mm泡沫铝/3mm聚脲/0.5mm钢板/50mm岩棉/1mm钢板
S-7	0.5mm钢板/30mm泡沫铝/0.5mm钢板/3mm聚脲/50mm岩棉/1mm钢板

距离/ cm	自由场压力测试值/kPa				平均值/ kPa	模拟压力/ kPa	相对误差/ %
距离/ cm	S-4	S-5	S-6	S-7	平均值/ kPa	模拟压力/ kPa	相对误差/ %
75	377.6	369.4	383.6	384.9	378.9	362.2	4.4
100	198.0	186.4	182.2	186.7	188.3	177.8	5.6
120	109.6	114.3	119.9	115.2	114.8	119.4	4.0
140	86.7	84.0	96.0	86.1	88.2	85.9	2.6
160	55.7	55.7	58.0	58.3	56.9	62.4	9.7

距离/ cm	自由场压力测试值/kPa				平均值/ kPa	模拟压力/ kPa	相对误差/ %
距离/ cm	S-4	S-5	S-6	S-7	平均值/ kPa	模拟压力/ kPa	相对误差/ %
75	377.6	369.4	383.6	384.9	378.9	362.2	4.4
100	198.0	186.4	182.2	186.7	188.3	177.8	5.6
120	109.6	114.3	119.9	115.2	114.8	119.4	4.0
140	86.7	84.0	96.0	86.1	88.2	85.9	2.6
160	55.7	55.7	58.0	58.3	56.9	62.4	9.7

样品	夹芯钢板着靶	夹芯钢板穿透	夹芯钢板穿透率/%	背板着靶	背板穿透	背板穿透率/%
S-4	9	5	55.6	4	1	25.0
S-5	7	2	28.6	2	0	0
S-6	8	1	12.5	1	0	0
S-7	8	3	37.5	2	0	0