论文标题

3D周期驱动的颗粒材料的记忆

Memory in 3D cyclically driven granular material

论文作者

Benson, Zackery A., Peshkov, Anton, Richardson, Derek C., Losert, Wolfgang

论文摘要

我们在循环压缩下对颗粒系统进行实验和数值研究,以研究可逆性和记忆效应。我们专注于准密集系统的准静态强迫,这与广泛的地球物理,工业和天体物理问题最相关。我们发现具有适当刚度和摩擦的软球模拟定量地再现了晶粒的转换和旋转位移。然后,我们利用这些模拟来证明此类系统能够存储以前的压缩历史。尽管平均翻译和旋转位移都编码了这种内存,但与旋转相比,翻译的响应根本不同。对于翻译位移,这种先验强迫的内存取决于静态粒子间摩擦的系数,但是旋转记忆并未因摩擦水平而改变。

We perform experimental and numerical studies of a granular system under cyclic-compression to investigate reversibility and memory effects. We focus on the quasi-static 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 inter-particle friction, but rotational memory is not altered by the level of friction.

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