Fu, Longlong Tian, Zhekan Zhou, Shunhua Zheng, Yuexiao Wang, Binglong
Published in
Granular Matter
SmartRock has recently been adopted in obtaining the particle-scale characteristics of ballast track and gives microscopic explanation of track performance under cyclic loads, such as degradation and reinforcement. We notice that the contact state of individual ballast particles changes with loading cycles, which in reverse gives rise to different ...
Guo, Hong Fu, Jiangtao Guo, Rui Xu, Qian Jiang, Hong Chen, Nengyuan
Published in
Granular Matter
AbstractBoth drag and lift forces impact an inclined plane when it is dragged through a granular bed. In this paper, the following results have been obtained: the drag and lift forces grow with the velocity of motion; when the immersion depth is constant, the inclination angle has no effect on drag force, however, the lift force increases linearly ...
Boaventura, Eduardo Célio Ducha, Fernando Andrade Atman, A. P. F.
Published in
Granular Matter
AbstractA new technique to obtain the stress response function of static granular layers from the geometric properties of the corresponding Voronoi tessellations is presented. We measured the vertex displacements of the Voronoi polygons due to the application of a vertical force located on the surface of the layer. A protocol to obtain the stress r...
Khoubani, Ali Evans, T. Matthew Yun, Tae Sup
Published in
Granular Matter
The connectivity of individual species in a locally heterogeneous granular mixture strongly influences assembly-scale behavior. A behavioral transition is observed at the percolation threshold for a given constituent; that is, the mixing fraction at which the constituent has statistical connectivity between two opposing boundaries. This behavior is...
Mollon, Guilhem
Published in
Granular Matter
Granular flows through converging sections such as conical hoppers have been reported to be submitted to instationarities, which in certain circumstances can appear to be organized and periodic. In this paper, we explore this phenomenon by conducting discrete element modelling simulations of a 3D gravity-driven hopper flow and varying a large numbe...
Liefferink, Rinse W. Aliasgari, Mojgan Maleki-Jirsaraei, Nahid Rouhani, Shahin Bonn, Daniel
Published in
Granular Matter
We present sliding experiments of a sledge on wetted sand and describe that the frictional response is controlled by the penetration hardness of the granular medium. Adding a small amount of water to sand increases the hardness which results in a decrease of the sliding friction. Pouring even more water to sand results in a decrease of the hardness...
Nguyen, Nhu H. T. Bui, Ha H. Nguyen, Giang D.
Published in
Granular Matter
In this study, we investigate the influence of material properties on the mobility of granular flow through granular column collapse experiments using the Smooth Particle Hydrodynamics method and a continuum constitutive model capable of describing the nonlinear responses of granular materials. Numerical simulations are systematically compared with...
Srivastava, Ishan Lechman, Jeremy B. Grest, Gary S. Silbert, Leonardo E.
Published in
Granular Matter
AbstractThe evolution of the internal granular structure in shear-arrested and shear-flowing states of granular materials is characterized using fabric tensors as descriptors of the internal contact and force networks. When a dilute system of frictional grains is subjected to a constant pressure and shear stress, the bulk stress ratio is well-predi...
Tomac, Ingrid Gutierrez, Marte
Published in
Granular Matter
This paper presents a study of the micromechanics of the coupled hydro-mechanical (H-M) behavior of brittle rock during hydraulic fracturing. The study is conducted using the discrete element method (DEM), which spatially discretizes a rock mass into discrete disc particles, coupled with a solver for modeling fluid flow through a network of connect...
Madrid, Marcos A. Pugnaloni, Luis A.
Published in
Granular Matter
When a granular material is freely discharged from a silo through an orifice at its base, the flow rate remains constant throughout the discharge. However, it has been recently shown that, if the discharge is forced by an overweight, the flow rate increases at the final stages of the discharge, in striking contrast to viscous fluids (Madrid et al. ...
