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An experimental and numerical study of blast induced shock wave mitigation in sandwich structures

机译:夹层结构爆炸冲击波缓和的实验与数值研究

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摘要

The liners of US military helmets are typically made using common soft foams. In order to better protect troops from Traumatic Brain Injury resulting from Improvised Explosive Devices, it is necessary to better understand the material properties involved in air blast mitigation. In this work, mitigation properties are studied using sandwich samples made from a vinyl-nitrile foam shell filled with materials which were selected to span a range of material properties. These materials-water, glycerin, glass beads, Aerogel~R, CAB-O-SIL~R, tuff volcanic rock, and expanding foam-were compared to both uniform vinyl-nitrile foam and a US Army helmet pad. Possible modes of shock attenuation include inertial effects based on density and acoustic impedance, dispersion based on porosity, and thermal effects. Since no standard test exists, we developed two experimental configurations to evaluate performance. The results were additionally used to verify a numerical model made using ABAQUS~R software. Both the numerical model and the experimental results were consistent in showing that most materials attenuate the peak blast pressure while Aerogel~R actually enhances the blast. Density and acoustic impedance mismatch are shown to be of primary importance while porosity is shown to have an effect as well. Furthermore, a differentiation is made between reflective and absorptive shock mitigation.
机译:美国军用头盔的衬里通常使用普通的软泡沫制成。为了更好地保护部队免受简易爆炸装置造成的颅脑外伤的伤害,有必要更好地了解缓解空气爆炸所涉及的材料特性。在这项工作中,使用由乙烯基腈泡沫壳制成的夹心样品研究缓解性能,该夹心样品填充了一定范围的材料性能的材料。与均匀的乙烯基腈泡沫和美国陆军头盔垫相比,这些材料(水,甘油,玻璃珠,Aerogel〜R,CAB-O-SIL〜R,凝灰岩火山岩和膨胀泡沫)进行了比较。减震的可能模式包括基于密度和声阻抗的惯性效应,基于孔隙率的色散以及热效应。由于不存在标准测试,因此我们开发了两个实验配置来评估性能。结果还用于验证使用ABAQUS〜R软件制作的数值模型。数值模型和实验结果均一致,表明大多数材料减弱了爆炸峰值压力,而Aerogel〜R实际上增强了爆炸效果。密度和声阻抗不匹配被证明是最重要的,而孔隙率也显示出影响。此外,在反射性和吸收性减震之间有区别。

著录项

  • 来源
    《Applied Acoustics》 |2013年第1期|1-9|共9页
  • 作者单位

    School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907, USA;

    Department of Mechanical Engineering, Purdue University, West Lafayette, IN 47907, USA;

    School of Aeronautics and Astronautics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA;

    Computation for Design and Optimization Program, Massachusetts Institute of Technology, Cambridge, MA 02139, USA;

    Department ofBiomedical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    A. Shock waves; B. Finite elements; C. Inhomogeneous material; D. Acoustics; E. Blast mitigation;

    机译:A.冲击波;B.有限元素;C.材料不均匀;D.声学;E.爆炸缓解;

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