Protective Performance of Helmet with Annular Composite Liner

doi:10.12382/bgxb.2023.1220

Abstract

Abstract:

The shock wave protection ability is the main performance index of individual soldier helmet,which is of great significance to improve solider battlefield survivability.To improve the protective effect of the individual soldier helmet against shock wave,the structure and arrangement of the liner of advanced combat helmet (ACH) are explored,and a design of ring-shaped outer edge liner is proposed,and its protective effect is evaluated.The protection performances of helmets with different structures and sizes of outer edge liner are tested in shock tube and real explosion field.The waveform and peak values of shock wave on the forehead,top and rear of head model are compared and analyzed.The experimental results show that,after wearing the helmet,the shock wave mainly enters through the gap between the helmet and head in diffraction form,and the accumulation and superposition of shock waves in the gap may increase the pressure.In addition,the local high pressure region which is far from the incoming wave is easy to form because of the underwash effect.The annular composite liner composited with polyurea-polyurethane foam-sponge can effectively prevent the diffraction wave from entering the inside of the helmet and reduce the superposition effect of diffraction wave.The attenuation rate of shock wave overpressure at each measuring point can reach more than 40% after wearing the helmet with annular composite liner.The smaller the gap formed during the shock wave action is under the condition of the incident shock wave (weak shock wave),the better the protective effect is.When the width of polyurea-polyurethane foam reaches 15 mm,the outer edge liner and the head model have the best fit degree and the protection effect is optimal.The experimental results show that the overpressure attenuation rates at the measuring points on forehead,top,and rear of head can reach 92.26%,88.82%,and 87.19%,respectively.

Key words: helmet, shock wave protection, outer edge liner, blast wave, shock tube

CLC Number:

O389

JIA Shiyu, WANG Cheng, XU Wenlong, MA Dong, QI Fangfang. Protective Performance of Helmet with Annular Composite Liner[J]. Acta Armamentarii, 2025, 46(1): 231220-.

Figures/Tables 14

Fig.1 Layout diagram of helmet with annular composite liner

Fig.2 Schematic and physical diagrams of annular composite liners with different stuctures

Table 1 Width parameters of different liners

工况	名称	聚脲宽度/ mm	泡沫宽度/ mm	海绵宽度/ mm
1	AL-10	10	10	10
2	AL-15	15	15	5
3	AL-20	20	20
4	AL-0			20
5	No-AL
6	裸头模

Fig.3 Measured pressures at port of shock tube in three repeated experiments

Fig.4 Photos of head model for the shock tube environment

Fig.5 Schematic diagram of far-field blast environment

Fig.6 Measured average pressures of shock waves in three repeated experiments

Fig.7 Photos of head model

Fig.8 The pressure-time curves at three measuring points in shock tube environment

Table 2 Peak value and attenuation rate of overpressure at eachmeasuring point under different conditions

名称	防护性能指标	前额	颅顶	后脑
裸头模	超压/kPa	45.46	20.64	18.56
No-AL	超压/kPa	46.74	9.51	31.59
No-AL	超压衰减率/%	-2.82	53.92	-70.20
AL-10	超压/kPa	6.72	5.12	9.77
AL-10	超压衰减率/%	85.22	75.19	47.36
AL-15	超压/kPa	1.18	4.45	9.07
AL-15	超压衰减率/%	97.40	78.44	51.13
AL-20	超压/kPa	3.68	5.62	10.24
AL-20	超压衰减率/%	91.90	72.77	44.83
AL-0	超压/kPa	12.39	8.68	14.38
AL-0	超压衰减率/%	72.75	57.95	22.52

Fig.9 Peak overpressure values at each measuring point under different conditions in shock tube environment

Fig.10 The pressure-time curves at three measuring points in real explosion field

Table 3 Peak value and attenuation rate of overpressure at eachmeasuring point under different conditions

名称	防护性能指标	前额	颅顶	后脑
裸头模	超压/kPa	184.13	124.01	181.25
No-AL	正压/kPa	97.17	44.78	64.68
	负压/kPa			-97.36
	超压衰减率/%	47.23	63.89	64.31
AL-10	正压/kPa	22.54	26.48	32.08
	负压/kPa			-117.52
	超压衰减率/%	87.76	78.65	82.30
AL-15	正压/kPa	14.26	13.87	23.21
	负压/kPa			-103.77
	超压衰减率/%	92.26	88.82	87.19
AL-20	正压/kPa	19.86	17.32	18.97
	负压/kPa			-136.24
	超压衰减率/%	89.21	86.03	89.53
AL-0	正压/kPa	41.83	37.30	105.05
	负压/kPa		-47.24	-123.38
	超压衰减率/%	77.28	69.92	42.04

Fig.11 Peak overpressure values at each measuring point under different conditions in real explosion field

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