Abstract

The evolution of the internal granular structure in shear-arrested and shear-flowing states of granular materials is characterized using fabric tensors as descriptors of the internal contact and force networks. When a dilute system of frictional grains is subjected to a constant pressure and shear stress, the bulk stress ratio is well-predicted from the anisotropy of its contact and force networks during transient flow prior to steady shear flow or shear arrest. Although the onset of shear arrest is a stochastic process, the fabric tensors upon arrest are distributed around nearly equal contributions of force and contact network anisotropy to the bulk stress ratio. The distribution becomes seemingly narrower with increasing system size. The anisotropy of the contact network in shear-arrested states is reminiscent of the fabric anisotropy observed in shear-jammed packings.

Graphic abstract

中文翻译：

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流阻过渡过程中内部颗粒结构的演变

摘要

使用织物张量作为内部接触力和力网络的描述符，可以表征颗粒材料在剪切滞留状态和剪切流动状态下内部颗粒结构的演变。当稀薄的摩擦颗粒系统受到恒定的压力和剪切应力时，在稳定剪切流或剪切停止之前的瞬态流动过程中，根据其接触力和力网络的各向异性可以很好地预测整体应力比。尽管剪力的开始是一个随机过程，但在张力作用下，织物张量在力和接触网络各向异性对整体应力比的几乎相等的贡献周围分布。随着系统规模的增加，分布似乎变窄了。

图形摘要