A study of blast wave protection efficiency of helmet based on air flow field pressure analysis

被引：0
|
作者：
Zhang W. [1 ,2 ]
Wang S. [2 ]
Liang Z. [1 ]
Qin B. [2 ]
Lu H. [2 ]
Chen X. [3 ]
Lu W. [4 ]
机构：
[1] College of Mechanical and Electrical Engineering, North University of China, Shanxi, Taiyuan
[2] Science and Technology on Transient Impact Laboratory, No.208 Institute of China Ordnance Industries, Beijing
[3] Unit 93320 of PLA, Heilongjiang, Qiqihar
[4] Henan North Hongyang Electromechanical Co. Ltd., Henan, Nanyang
来源：
Baozha Yu Chongji/Explosion and Shock Waves | 2022年 / 42卷 / 11期
关键词：
air flow field pressure; blast wave; combat helmet; numerical simulation; protection;
D O I：
10.11883/bzycj-2021-0411
中图分类号：
学科分类号：
摘要：
To study the protective effect of a typical combat helmet against traumatic brain injury induced by blast wave, an anti-explosion test was first carried out, in which 50 g TNT was used to produce blast wave acting on a head model with or without helmet protection located at 1m away from explosion position. Pressure sensors were installed on the forehead, cranial, parietal and postcranial of the head model, while the front end of each sensor was in touch with the surface of the head model. Secondly, based on the 3rd Military Medical University’s visualization body slice data set (CVH), a finite element model with the typical head structure was established. The head of the finite element model contained skin, skull, cranial, cerebrospinal fluid, brain tissue, dura mater and pia mater. All the membrane structures are meshed into quadrilateral shell elements, while the remaining parts are all meshed into cubic solid elements. The finite element model of the head is then loaded by the blast wave, and the experimental conditions are simulated by the display dynamic analysis software of LS-DYNA. The validity of the simulation model is verified by the test results. Next, the pressure variation of the blast wave flow field under different working conditions is analyzed by numerical simulation, meanwhile the effect of foam liner on helmet protection capability is studied. The results show that the typical combat helmet can attenuate the frontal air overpressure to 54.5% of that without helmet protection, but it would enhance the air overpressure on the posterior cranial to 2.19 times that without protection, which harms the protection of posterior cranial. The foam padding in helmet suspension can reduce the negative effect of the helmet on cranial posterior protection and improve the protective ability of the helmet against the blast wave. The results also show that the auricle structure amplifies the overpressure of the blast wave to 1.7 times the free field in the same position under the frontal blast wave, which is an important target organ of blast wave action. © 2022 Explosion and Shock Waves. All rights reserved.
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