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首页> 外文期刊>Materials Science and Engineering >Molecular-level simulations of shock generation and propagation in polyurea
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Molecular-level simulations of shock generation and propagation in polyurea

机译：聚脲中冲击波产生和传播的分子水平模拟

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摘要

A non-equilibrium molecular dynamics method is employed in order to study various phenomena accompanying the generation and propagation of shock waves in polyurea (a micro-phase segregated elastomer). Several recent studies reported in the literature suggested that polyurea has a relatively high potential for mitigation of the effects associated with blast and ballistic impact. This behavior of polyurea is believed to be closely related to its micro-phase segregated microstructure (consisting of the so-called "hard domains" and a soft matrix) and to different phenomena/processes (e.g. inelastic-deformation and energy-dissipation) taking place at, or in the vicinity of, the shock front. The findings obtained in the present analysis are used to help elucidate the molecular-level character of these phenomena/processes. In addition, the analysis yielded the shock Hugoniot (i.e. a set of axial stress vs. density/specific-volume vs. internal energy vs. particle velocity vs. temperature vs. shock speed) material states obtained in polyurea after the passage of a shock wave. The availability of a shock Hugoniot is critical for construction of a high deformation-rate, large-strain, high pressure material models which can be used within a continuum-level computational analysis to capture the response of a polyurea-based macroscopic structure (e.g. blast-protection helmet suspension pads) to blast/ballistic impact loading.
机译：为了研究伴随在聚脲（一种微相分离的弹性体）中冲击波的产生和传播的各种现象，采用了非平衡分子动力学方法。文献中报道的几项最新研究表明，聚脲在缓解与爆炸和弹道撞击有关的影响方面具有相对较高的潜力。据信，聚脲的这种行为与其微相分离的微观结构（由所谓的“硬域”和软基质组成）以及不同的现象/过程（例如，非弹性变形和能量耗散）密切相关。放置在避震器前面或附近。本分析中获得的发现可用于帮助阐明这些现象/过程的分子水平特征。此外，该分析还得出了在冲击通过后聚脲中获得的休克尼奥特（即一组轴向应力与密度/比容与内部能量，粒子速度，温度与冲击速度）的冲击状态。波。震荡Hugoniot的可用性对于构建高变形率，大应变，高压材料模型至关重要，该模型可用于连续水平的计算分析中，以捕获基于聚脲的宏观结构（例如爆炸）的响应。 -保护头盔悬挂垫）以爆炸/弹道冲击载荷。

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  • 来源
    《Materials Science and Engineering》 |2011年第11期|p.3799-3808|共10页
  • 作者

    M. Grujicic; B. Pandurangan; W.C Bell; B.A. Cheeseman; C.-F. Yen; C.L Randow;

  • 作者单位

    Department of Mechanical Engineering, C/emson University, Clemson, SC 29634, United States;

    Department of Mechanical Engineering, C/emson University, Clemson, SC 29634, United States;

    Department of Mechanical Engineering, C/emson University, Clemson, SC 29634, United States;

    Army Research Laboratory - Weapons & Materials Research Directorate, Aberdeen, Proving Ground, MD 21005-5069, United States;

    Army Research Laboratory - Weapons & Materials Research Directorate, Aberdeen, Proving Ground, MD 21005-5069, United States;

    Army Research Laboratory - Weapons & Materials Research Directorate, Aberdeen, Proving Ground, MD 21005-5069, United States;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    polyurea; shock-wave generation and propagation; molecular-level calculations;

    机译：聚脲冲击波的产生和传播;分子水平计算;

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