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Protective Mechanism of Helmet Under Far-field Shock Wave
International Journal of Impact Engineering ( IF 5.1 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.ijimpeng.2020.103617
Jintao Li , Tian Ma , Chao Huang , Xiancong Huang , Yue Kang , Zhizhou Long , Moubin Liu

Abstract In order to understand the protective mechanism of helmet against shock wave, a head model under far-field blast is investigated experimentally and numerically. The distribution of overpressure on the surface of the head model are obtained and compared. The numerical simulations are carried out using the Multi-Material Arbitrary Lagrangian Eulerian (MM-ALE) technique with suitable material models for a Kevlar helmet and soft pads. The differences in the distributions of overpressure on the head models with and without the protection of the helmet are analyzed. The interaction of shock waves around the head and the helmet is investigated. Our experimental observations and numerical results indicate that, if protected by a helmet in the case of a shock wave acting from the front, the peaks of overpressure on the head are reduced at the top area, but increased at the rear area. The numerical simulations also show that the enhancement of the overpressure at the rear is mainly due to the collision of the shock wave. The underwash phenomenon also occurs when the shock wave acts from the side or the rear.

中文翻译:

远场冲击波下头盔的防护机制

摘要 为了解头盔对冲击波的防护机制,对远场冲击下的头部模型进行了实验和数值研究。获得并比较了头部模型表面的超压分布。数值模拟是使用多材料任意拉格朗日欧拉 (MM-ALE) 技术以及适用于 Kevlar 头盔和软垫的合适材料模型进行的。分析了带头盔保护和不带头盔保护的头部模型超压分布的差异。研究了头部和头盔周围冲击波的相互作用。我们的实验观察和数值结果表明,如果在冲击波从正面作用的情况下用头盔保护,头部超压峰值在顶部区域减少,但在后部区域增加。数值模拟还表明,后方超压的增强主要是由于冲击波的碰撞。当冲击波从侧面或背面作用时,也会发生底洗现象。
更新日期:2020-09-01
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