Force transmission in dry and wet granular media

Richefeu, Vincent; Youssoufi, Moulay Saı̈d El; Azéma, Émilien; Radjaï, Farhang

doi:10.1016/j.powtec.2008.04.069

Cited by 64 publications

(45 citation statements)

References 33 publications

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“…In a dry cohesionless packing, these chains are propped by the weak compressive forces . The tensile bonds play a similar role with respect to the force chains in the presence of cohesion Richefeu et al 2009). On the other hand, the parameter a * t is basically an effect of enhanced friction due to cohesion.…”

Section: Coulomb Cohesion In the Critical Statementioning

confidence: 99%

Bond anisotropy and cohesion of wet granular materials

Radjaï

Richefeu²

2009

Phil. Trans. R. Soc. A.

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We analyse the Coulomb cohesion of wet granular materials and its relationship with the distribution of capillary bonds between particles. We show that, within a harmonic representation of the bond and force states, the shear strength can be expressed as a state equation in terms of internal anisotropy parameters. This formulation involves a dependence of the shear strength on loading direction and leads to the fragile behaviour of granular materials. The contact dynamics simulations of a wet material, in which a capillary force law is prescribed, are in excellent agreement with the predictions of this model. We find that the fragile character decreases as the local adhesion is increased or the mean stress is decreased.

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Section: Coulomb Cohesion In the Critical Statementioning

confidence: 99%

Bond anisotropy and cohesion of wet granular materials

Radjaï

Richefeu²

2009

Phil. Trans. R. Soc. A.

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“…From a granular viewpoint, the discrete numerical models such as molecular dynamics (MD) and non-smooth contact dynamics (NSCD) are based on a microscopic description of the system at the particle scale, allowing to consider without difficulty complex textures that might involve polydisperse size distribution, specific contact laws (friction, cohesion, capillarity) or various shapes for the particles [9][10][11][12][13]. In the presence of a liquid phase, however, an adequate description at the microscopic scale requires in addition the coupling with a fluid method (lattice Boltzmann, finite element, finite volume) to properly account for the effect of hydrodynamic forces on the granular phase.…”

Section: Introductionmentioning

confidence: 99%

Micro-rheology of dense particulate flows: Application to immersed avalanches

Topin

Dubois

Monerie

et al. 2011

Journal of Non-Newtonian Fluid Mechanics

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a b s t r a c tWe rely here on a non-smooth contact dynamics (NSCD) approach to treat particle collisions in a direct numerical simulation of a dense particulate flow. Interactions between particles are considered by a nonsmooth formulation of particle dynamics at the microscopic scale, which enables one to straightforwardly implement complex contact laws. The hydrodynamic coupling is achieved by a distributed Lagrange multiplier/fictitious domain (DLM/FD) method. As a preliminary step, the relevance of our NSCD-DLM/FD method is assessed by comparing results of 2D sedimentation simulations with those obtained with a usual molecular dynamics collision model. Then, we use it to investigate how a fully immersed granular packing collapses depending on its initial particle volume fraction, providing clues on the micro-rheology of dense particulate flows.

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“…From a quantitative viewpoint, it is interesting to notice that macroscopic friction angles obtained from both experimentally recorded and identified forces, were about the same. Similarly, satisfactory agreements were obtained for the principal directions of the stress tensor, and the distribution of normal forces was consistent: large extent of the forces (from 0 to 5 times the mean value), exponential tail, and a plateau of weak forces that reflects the anisotropy of the packing mainly due to the nearly monosized distribution of grains [11].…”

Section: A First Outcomementioning

confidence: 60%

An attempt in assessing contact forces from a kinematic field

Richefeu¹,

Combe²,

Maurin³

2013

AIP Conference Proceedings

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Abstract. In granular materials, it is not so simple to assess experimentally the contact forces. Photoelasticity is generally used for this purpose but this technique involves some constraints that may limit its use. We propose a different solution, which implements both the digital image correlation (DIC) technique and the non-smooth contact dynamics (NSCD) formalism. In a nutshell, the technique aims to find a set of contact forces mechanically admissible given a set of measured contact velocities. We used photographs of a simple shear test of a two-dimensional analogue granular material (about 1000 aluminum rods) to apply the solution, and we showed that valuable information about the contact forces can be extracted from the kinematic field provided that no major rearrangement occurs for at least five image shots.

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Force transmission in dry and wet granular media

Cited by 64 publications

References 33 publications

Bond anisotropy and cohesion of wet granular materials

Bond anisotropy and cohesion of wet granular materials

Micro-rheology of dense particulate flows: Application to immersed avalanches

An attempt in assessing contact forces from a kinematic field

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