Combined effects of contact friction and particle shape on strength properties and microstructure of sheared granular media.,Physical Review E

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Combined effects of contact friction and particle shape on strength properties and microstructure of sheared granular media.
Physical Review E ( IF 2.2 ) Pub Date : 2020-08-03 , DOI: 10.1103/physreve.102.022901
Theechalit Binaree ₁ , Emilien Azéma ₂ , Nicolas Estrada ₃ , Mathieu Renouf ₂ , Itthichai Preechawuttipong ₁

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We present a systematic numerical investigation concerning the combined effects of sliding friction and particle shape (i.e., angularity) parameters on the shear strength and microstructure of granular packings. Sliding friction at contacts varied from 0 (frictionless particles) to 0.7, and the particles were irregular polygons with an increasing number of sides, ranging from triangles to disks. We find that the effect of local friction on shear strength follows the same trend for all shapes. Strength first increases with local friction and then saturates at a shape-dependent value. In contrast, the effect of angularity varies, depending on the level of sliding friction. For low friction values (i.e., under 0.3), the strength first increases with angularity and then declines for the most angular shapes. For high friction values, strength systematically increases with angularity. At the microscale, we focus on the connectivity and texture of the contact and force networks. In general terms, increasing local friction causes these networks to be less connected and more anisotropic. In contrast, increasing particle angularity may change the network topology in different directions, directly affecting the macroscopic shear strength. These analyses and data constitute a first step toward understanding the joint effect of local variables such as friction and grain shape on the macroscopic rheology of granular systems.

中文翻译：

接触摩擦和颗粒形状对剪切颗粒介质强度特性和微观结构的综合影响。

我们提出了有关滑动摩擦和颗粒形状（即，棱角性）参数对粒状填料抗剪强度和微观结构的综合影响的系统数值研究。接触处的滑动摩擦从0（无摩擦颗粒）变化到0.7，并且颗粒是不规则的多边形，且边的数量从三角形到磁盘逐渐增加。我们发现，对于所有形状，局部摩擦对剪切强度的影响都遵循相同的趋势。强度首先随着局部摩擦而增加，然后达到与形状有关的值。相反，成角度的影响根据滑动摩擦的程度而变化。对于低摩擦值（即，小于0.3），强度首先随角度变化而增加，然后针对大多数角度形状而下降。对于高摩擦值，强度随着角度的增加而系统地增加。在微观上，我们专注于接触和力网络的连通性和纹理。一般而言，局部摩擦的增加会导致这些网络之间的连接较少且更具各向异性。相反，增加颗粒的角度可能会在不同方向上改变网络拓扑，直接影响宏观剪切强度。这些分析和数据构成了了解局部变量（例如摩擦和晶粒形状）对颗粒系统宏观流变学的联合影响的第一步。增大颗粒的角度可能会在不同方向改变网络拓扑，直接影响宏观剪切强度。这些分析和数据构成了迈向了解局部变量（例如摩擦和晶粒形状）对颗粒系统宏观流变学的联合影响的第一步。增大颗粒的角度可能会在不同方向改变网络拓扑，直接影响宏观剪切强度。这些分析和数据构成了了解局部变量（例如摩擦和晶粒形状）对颗粒系统宏观流变学的联合影响的第一步。

更新日期：2020-08-03

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