Frictional weakening of a granular sheared layer due to viscous rolling revealed by discrete element modeling
(2024) Granular Matter — Vol. 26, n° 2, p. 36 (2024)
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- Authors
Sac-Morane, Alexandre 
- Abstract
- Considering a 3D sheared granular layer through a discrete element modeling, it is well known the rolling resistance infuences the macro friction coefcient. Even if the rolling resistance role has been deeply investigated previously because it is commonly used to represent the shape and the roughness of the grains, the rolling viscous damping coefcient is still not studied. This parameter is rarely used or only to dissipate the energy and to converge numerically. This paper revisits the physical role of those coefcients with a parametric study of the rolling friction and the rolling damping at diferent shear speeds and diferent confnement pressures. It has been observed the damping coefcient induces a frictional weakening. Indeed, competition between the rolling resistance and the rolling damping occurs. Angular resistance aims to avoid grains rolling, decreasing the diference between the angular velocities of grains. Whereas, angular damping acts in the opposite, avoiding a change in the diference between the angular velocities of grains. In consequence, grains stay rolling and the sample toughness decreases. This efect must be considered to not overestimate the frictional response of a granular layer.
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Citations
Sac-Morane, A., Veveakis, M., & Rattez, H. (2024). Frictional weakening of a granular sheared layer due to viscous rolling revealed by discrete element modeling. Granular Matter, 26(2), 36. https://doi.org/10.1007/s10035-024-01407-5 (Original work published 2024)