Rheological study reveals shear-thinning and localized surface depressions in sheared nonspherical grains, indicating particle alignment governs bulk and surface granular friction.
Shearing shape-anisotropic grains in a split-bottom shear cell form a localized shear band with a depression at its center. Our study reveals how particle alignment affects the packing density, stress distribution, macro-friction, viscosity, and shear-thinning behavior with the increase in the aspect ratio of the particles. A scaling law correlates the particle aspect ratio to macroscopic friction and effective viscosity, revealing shear-thinning behavior in the bulk and near the surface.
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Rahim et al. (2024) studied this question.
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