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首页> 外文期刊>Journal of Materials Engineering and Performance >Shock-Wave Attenuation and Energy-Dissipation Potential of Granular Materials
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Shock-Wave Attenuation and Energy-Dissipation Potential of Granular Materials

机译：颗粒材料的冲击波衰减和能量耗散势

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The propagation of uniaxial-stress planar shocks in granular materials is analyzed using a conventional shock-physics approach. Within this approach, both compression shocks and decompression waves are treated as (stress, specific volume, particle velocity, mass-based internal energy density, temperature, and mass-based entropy density) propagating discontinuities. In addition, the granular material is considered as being a continuum (i.e., no mesoscale features like grains, voids, and their agglomerates are considered). However, while the granular material is treated as a (smeared-out) continuum, it is recognized that it contains a solid constituent (parent matter), and that the structurodynamic properties (i.e., Equations of State (EOS) and Hugoniot relations) of the granular material are related to its parent matter. Three characteristic shock loading regimes of granular material are considered and, in each case, an analysis is carried out to elucidate shock attenuation and energy dissipation processes. In addition, an attempt is made to identify a metric (a combination of the material parameters) which quantifies the intrinsic ability of a granular material to attenuate a shock and dissipate the energy carried by the shock. Toward that end, the response of a typical granular material to a flat-topped compressive stress pulse is analyzed in each of the three shock loading regimes.
机译：使用常规的冲击物理方法分析了颗粒材料中单轴应力平面冲击的传播。在这种方法中，压缩激波和减压波都被视为（应力，比体积，粒子速度，基于质量的内部能量密度，温度和基于质量的熵密度）传播的不连续性。另外，粒状材料被认为是连续体（即，不考虑中尺度特征，例如晶粒，空隙及其附聚物）。但是，虽然将粒状材料视为（涂污的）连续体，但应认识到它包含固体成分（母体），并且结构动力学特性（即状态方程（EOS）和Hugoniot关系）粒状物质与其母物质有关。考虑了颗粒材料的三种特征性冲击载荷机制，并分别进行了分析以阐明冲击衰减和能量耗散过程。另外，尝试确定度量（材料参数的组合），该度量量化粒状材料衰减冲击并消散冲击所携带的能量的固有能力。为此，在三种冲击载荷状态的每一种中，分析了典型颗粒材料对平顶压应力脉冲的响应。

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