@proceedings {368,
	title = {Comparison of the effects of rolling resistance and angularity in sheared granular media},
	journal = {7th International Conference on Micromechanics of Granular Media (Powders and Grains)},
	volume = {Book Series: AIP Conference Proceedings  POWDERS AND GRAINS 2013},
	year = {2013},
	month = {Jul-2013},
	pages = {891-894},
	address = {JUL 08-12 2013 Sydney, AUSTRALIA},
	abstract = {<p>In this paper, we compare the effect of rolling resistance at the contacts in granular systems composed of disks with the effect of angularity in granular systems composed of regular polygonal particles. For this purpose, we use contact dynamics simulations. By means of a simple shear numerical device, we investigate the mechanical behavior of these materials in the steady state in terms of shear strength, solid fraction, force and fabric anisotropies, and probability distribution of contact forces. We find that, based on the energy dissipation associated with relative rotation between two particles in contact, the effect of rolling resistance can explicitly be identified with that of the number of sides in a regular polygonal particle. This finding supports the use of rolling resistance as a shape parameter accounting for particle angularity and shows unambiguously that one of the main influencing factors behind the mechanical behavior of granular systems composed of noncircular particles is the partial hindrance of rotations as a result of angular particle shape.</p>
},
	keywords = {angularity, anisotropy, force distribution, Granular material, rolling resistance, Shear strength, solid fraction},
	url = {https://hal.archives-ouvertes.fr/hal-00842799},
	author = {Estrada, Nicolas and Emilien Az{\'e}ma and Farhang Radja{\"\i} and Taboada, Alfredo},
	editor = {Yu, A and Dong, K and Yang, R}
}
@proceedings {363,
	title = {Shear strength and microstructure of 3D assemblies of platy particles},
	journal = {7th International Conference on Micromechanics of Granular Media (Powders and Grains)},
	volume = {Book Series: AIP Conference Proceedings  POWDERS AND GRAINS 2013},
	year = {2013},
	month = {Jul-09-2013},
	pages = {519-522},
	address = {JUL 08-12 2013 Sydney, AUSTRALIA},
	abstract = {<p>As a first step towards particle-scale modeling of clayey soils, we investigate the mechanical behavior and microstructure of assemblies of three-dimensional rectangular platy particles by means of the discrete element method. Several samples composed of particles of different levels of platyness (ratio of width to thickness) were numerically prepared and sheared to large deformations. We analyze the shear strength, packing fraction, connectivity, contact and force anisotropies, and mobilization of friction forces as functions of platyness.We find that both the mechanical behavior and microstructure are strongly dependent on the degree of platyness. This happens, in particular, because of the alignment of particle faces along a particular direction. Additionally, as observed for other granular materials with complex shapes, the packing fraction passes by a peak value before decreasing for larger values of platyness.</p>
},
	keywords = {Clays, DEM, Microstructure, Shear strength},
	url = {https://hal.archives-ouvertes.fr/hal-00842787},
	author = {Boton, Mauricio and Emilien Az{\'e}ma and Estrada, Nicolas and Farhang Radja{\"\i} and Lizcano, Arcesio},
	editor = {Yu, A and Dong, K and Yang, R}
}
