Wave propagation in one-dimensional microscopic granular chains.
Wave propagation in one-dimensional microscopic granular chains.
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一维微观颗粒链中的波传播。
DOI：
10.1103/physreve.94.052907
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
C. Daraio
中科院分区：
文献类型：
--
作者：
Wei;C. Daraio
我们使用非接触光学技术在未压缩的一维微观颗粒链中产生和测量应力波，并用离散的数值模拟支持我们的实验。我们发现，波在干颗粒(150μm半径)中的传播是高度非线性的，并且受到缺陷(例如，表面粗糙度、颗粒间隙和错位)的显著影响。我们推导了群速度与间隙大小之间的解析关系，并定义了作为间隙大小和轴向失调的函数的高度非线性孤立波的形成界限。
We employ noncontact optical techniques to generate and measure stress waves in uncompressed, one-dimensional microscopic granular chains, and support our experiments with discrete numerical simulations. We show that the wave propagation through dry particles (150 μm radius) is highly nonlinear and it is significantly influenced by the presence of defects (e.g., surface roughness, interparticle gaps, and misalignment). We derive an analytical relation between the group velocity and gap size, and define bounds for the formation of highly nonlinear solitary waves as a function of gap size and axial misalignment.