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Steady state rheology of homogeneous and inhomogeneous cohesive granular materials

机译：均质和非均质粘性粒状材料的稳态流变学

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摘要

This paper aims to understand the effect of different particle/contact properties like friction, softness and cohesion on the compression/dilation of sheared granular materials. We focus on the local volume fraction in steady state of various non-cohesive, dry cohesive and moderate to strong wet cohesive, frictionless-to-frictional soft granular materials. The results from (1) an inhomogeneous, slowly sheared split-bottom ring shear cell and (2) a homogeneous, stress-controlled simple shear box with periodic boundaries are compared. The steady state volume fractions agree between the two geometries for a wide range of particle properties. While increasing inter-particle friction systematically leads to decreasing volume fractions, the inter-particle cohesion causes two opposing effects. With increasing strength of cohesion, we report an enhancement of the effect of contact friction i.e. even smaller volume fraction. However, for soft granular materials, strong cohesion causes an increase in volume fraction due to significant attractive forces causing larger deformations, not visible for stiff particles. This behaviour is condensed into a particle friction-Bond number phase diagram, which can be used to predict non-monotonic relative sample dilation/compression.
机译：本文旨在了解不同颗粒/接触特性（如摩擦，柔软度和内聚力）对剪切颗粒材料的压缩/膨胀的影响。我们专注于各种非粘性，干粘性和中度到强湿粘性，无摩擦到摩擦的软颗粒材料在稳态下的局部体积分数。比较了（1）非均匀，缓慢剪切的裂底环形剪切单元和（2）具有周期边界的均匀应力控制简单剪切箱的结果。对于广泛的粒子特性，稳态体积分数在两个几何形状之间是一致的。虽然增加粒子间摩擦会系统地导致体积分数减小，但粒子间内聚力会产生两个相反的效果。随着内聚强度的增加，我们报告了接触摩擦效果的增强，即体积分数更小。但是，对于软颗粒材料，由于明显的吸引力会导致较大的形变，而强的凝聚力会导致体积分数增加，这对于硬质颗粒是不可见的。此行为被浓缩为粒子摩擦键数相图，可用于预测非单调的相对样品膨胀/压缩。

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