Abstract.

In order to get insight into the rheology and texture of rough unsaturated granular flows, we study the effects of the inter-particle friction coefficient on the macroscopic attributes and the texture variables of steady-state shearing flow of wet granular materials by relying on three-dimensional (3D) particle dynamics simulations. The macroscopic attributes are characterized by the macroscopic friction coefficient, macroscopic cohesion, and the packing fraction. The microstructural variables are characterized by the fabric and force anisotropies, the coordination number, and the stress transmission ratio. We show that the macroscopic observables behave as a function of the inertial number as a dry case for different values of the inter-particle friction coefficient. In particular, the macroscopic friction coefficient increases and the packing fraction decreases rapidly for small values of the friction coefficient, then they almost reach plateaus for higher values of the friction coefficient. Interestingly, all the macroscopic observables nicely behave as a function of the small values of the friction coefficient. Similarly, we also observe these characteristics for the fabric and force anisotropies and the coordination number as well as the stress transmission ratio which reflects the intermediate relationship between the microstructure and the mechanical behavior of such flows.

Graphical abstract

中文翻译：

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颗粒间摩擦对湿颗粒流的流变性和织构的作用

摘要。

为了深入了解粗糙的不饱和粒状流的流变学和织构，我们通过以下三个方面研究颗粒间摩擦系数对湿粒状材料稳态剪切流的宏观属性和织构变量的影响。 （3D）粒子动力学模拟。宏观属性的特征在于宏观摩擦系数，宏观内聚力和堆积率。微观结构变量的特征在于织物和力的各向异性，配位数和应力传递比。我们表明，对于不同的粒子间摩擦系数值，宏观观测值表现为惯性数的函数，作为干燥情况。尤其是，对于较小的摩擦系数值，宏观摩擦系数会增加，而填充率会迅速降低，对于较高的摩擦系数值，它们几乎会达到平稳状态。有趣的是，所有宏观可观察物都很好地表现为摩擦系数小的值的函数。同样，我们还观察到了织物和力各向异性，配位数和应力传递比的这些特性，这些特性反映了这种流动的微观结构和机械行为之间的中间关系。所有的宏观可观察物都很好地表现为较小的摩擦系数值的函数。同样，我们还观察到了织物和力各向异性，配位数和应力传递比的这些特性，这些特性反映了这种流动的微观结构和机械行为之间的中间关系。所有的宏观可观察物都很好地表现为较小的摩擦系数值的函数。同样，我们还观察到了织物和力各向异性，配位数和应力传递比的这些特性，这些特性反映了这种流动的微观结构和机械行为之间的中间关系。

图形概要