Abstract
The shape of the particles and local friction, separately, are known to strongly affect the macroscopic properties of an assembly of grains. But the combined effects of these two parameters still remain poorly described. By means of extensive two dimensional contact dynamics simulations, we perform a systematic analysis of the interplay between friction and shape on strength properties of granular systems. The shape of the particles is varied from disks to triangles, while the friction is varied from 0 to 0.7. We find that the macroscopic friction first increases with angularity, but it may decline (for low friction values), saturate (for intermediates friction values), or continue to increase (for large friction values) for the most angular shapes. In other words, the effect of the particle’s angularity on the shear strength depends on the level of sliding friction. In contrast, the effect of local friction on the shear strength does not depend on the specific properties of shape. The results presented here highlight the subtle coupling existing between shape and friction effects.
Highlights
Particle shape is an intrinsic characteristic that plays an important role in the microstructure and mechanical behavior of granular media [1]
Local friction is a key element in the build-up of anisotropic structures at the origins of strength
By means of two dimensional Contact Dynamics simulations, we presented a systematic analysis of the coupled effects of particle shape and local friction on the strength properties of granular systems
Summary
Particle shape is an intrinsic characteristic that plays an important role in the microstructure and mechanical behavior of granular media [1]. Local friction is a key element in the build-up of anisotropic structures at the origins of strength It has been constantly shown in the literature that shear strength first increases with local friction and saturates at a constant value, even if local friction continues to increase [14,15,16,17,18,19,20]. The use of a rolling resistance in disks assemblies ignores the geometrical restrictions induced by a non-circular shape In this sense, such studies assume that shape and friction are uncoupled.
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