Memory in three-dimensional cyclically driven granular material
Memory in three-dimensional cyclically driven granular material
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三维循环驱动颗粒材料中的记忆
DOI：
10.1103/physreve.103.062906
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发表时间：
2021
影响因子：
2.4
通讯作者：
Losert, Wolfgang
中科院分区：
文献类型：
--
作者：
Benson, Zackery A.;Peshkov, Anton;Richardson, Derek C.;Losert, Wolfgang
我们对循环压缩下的颗粒系统进行了实验和数值研究，以研究可逆性和记忆效应。我们专注于稠密系统的准静态强迫，这是最相关的广泛的地球物理，工业和天体物理问题。我们发现，软球模拟具有适当的刚度和摩擦定量再现的平移和旋转位移的晶粒。然后，我们利用这些模拟来证明，这样的系统能够存储以前的压缩的历史。虽然平均平移和旋转位移都编码这种记忆，但与旋转相比，平移的响应根本不同。对于平移位移，这种先前强迫的记忆取决于颗粒间的静摩擦系数，但旋转记忆不受摩擦水平的影响。
We perform experimental and numerical studies of a granular system under cyclic compression to investigate reversibility and memory effects. We focus on the quasistatic forcing of dense systems, which is most relevant to a wide range of geophysical, industrial, and astrophysical problems. We find that soft-sphere simulations with proper stiffness and friction quantitatively reproduce both the translational and rotational displacements of the grains. We then utilize these simulations to demonstrate that such systems are capable of storing the history of previous compressions. While both mean translational and rotational displacements encode such memory, the response is fundamentally different for translations compared to rotations. For translational displacements, this memory of prior forcing depends on the coefficient of static interparticle friction, but rotational memory is not altered by the level of friction.