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Impact energy distribution and wavefront shape in granular material assemblies

机译：粒状材料组件中的冲击能量分布和波前形状

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In this study, we investigated the dynamic response of granular materials subjected to point impact loading based on the discrete element method. The average velocity of the stress pulse was defined. The effect of elastic modulus on wave velocity was analyzed. The energy diffusion process in granular materials is affected by the contact between the particles, which is mainly reflected in two aspects: contact distribution and force transmission ratio. We first compared the wavefront shape in the specimens with different particle arrangements, and then assigned different material properties to the matrix particles. The wavefront shape is consistent with the previous results which proved the influence of the force transmission ratio. Finally, the variations of particle acceleration, kinetic energy and wave velocity at different impact angles are discussed. Our research reveals the energy propagation process through the contact between particles within granular materials. Our research results can be a reference for material design using granular materials for energy collection, energy absorbing etc.
机译：在这项研究中，我们研究了基于离散元方法的粒状材料在点冲击载荷下的动力响应。定义了应力脉冲的平均速度。分析了弹性模量对波速的影响。颗粒材料中的能量扩散过程受颗粒之间的接触影响，这主要体现在两个方面：接触分布和力传递比。我们首先比较了具有不同粒子排列的样本中的波前形状，然后为基质粒子分配了不同的材料属性。波前形状与先前的结果一致，证明了传力比的影响。最后，讨论了不同撞击角度下粒子加速度，动能和波速的变化。我们的研究揭示了通过颗粒材料内颗粒之间的接触进行的能量传播过程。我们的研究结果可以为使用颗粒状材料进行能量收集，能量吸收等的材料设计提供参考。

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