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Sheared Amorphous Packings Display Two Separate Particle Transport Mechanisms
Physical Review Letters ( IF 8.6 ) Pub Date : 2020-09-24 , DOI: 10.1103/physrevlett.125.138001
Dong Wang , Joshua A. Dijksman , Jonathan Barés , Jie Ren , Hu Zheng

Shearing granular materials induces nonaffine displacements. Such nonaffine displacements have been studied extensively, and are known to correlate with plasticity and other mechanical features of amorphous packings. A well known example is shear transformation zones as captured by the local deviation from affine deformation, Dmin2, and their relevance to failure and stress fluctuations. We analyze sheared frictional athermal disc packings and show that there exists at least one additional mesoscopic transport mechanism that superimposes itself on top of local diffusive motion. We evidence this second transport mechanism in a homogeneous system via a diffusion tensor analysis and show that the trace of the diffusion tensor equals the classic Dmin2 when this second mesoscopic transport is corrected for. The new transport mechanism is consistently observed over a wide range of volume fractions and even for particles with different friction coefficients and is consistently observed also upon shear reversal, hinting at its relevance for memory effects.

中文翻译:

剪切的无定形填料显示两种独立的颗粒传输机制

剪切颗粒状物质会引起非仿射位移。这种非仿射位移已被广泛研究,并且已知与无定形填料的可塑性和其他机械特征相关。一个众所周知的例子是剪切变形区域,该区域由仿射变形的局部偏差捕获,d2,以及它们与故障和压力波动的关系。我们分析了剪切摩擦非热盘填料,并表明至少存在一种附加的介观传输机制,该机制将自身叠加在局部扩散运动之上。我们通过扩散张量分析证明了均质系统中的第二种传输机理,并表明扩散张量的迹线等于经典d2当第二次介观传输被校正时。在广泛的体积分数范围内,甚至对于具有不同摩擦系数的颗粒,都可以持续观察到新的传输机制,并且在剪切逆转时也可以持续观察到新的传输机制,这暗示了其与记忆效应的相关性。
更新日期:2020-09-24
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