Mechanical behaviour and failure of cohesive granular materials

Delenne, Jean‐Yves; Youssoufi, Moulay Saı̈d El; Cherblanc, Fabien; Bénet, Jean‐Claude

doi:10.1002/nag.401

Cited by 152 publications

(107 citation statements)

References 22 publications

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“…This is why a criterion of breakage can be introduced by a destruction function ζ(F N , F S , M B , M T ), whose positive value indicates breakage. Here, a simple energy-like function is used [29]:…”

Section: Model For the Plasticitymentioning

confidence: 99%

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Restructuring of colloidal aggregates in shear flow

et al. 2012

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Abstract. A method to couple interparticle contact models with Stokesian dynamics (SD) is introduced to simulate colloidal aggregates under flow conditions. The contact model mimics both the elastic and plastic behavior of the cohesive connections between particles within clusters. Owing to this, clusters can maintain their structures under low stress while restructuring or even breakage may occur under sufficiently high stress conditions. SD is an efficient method to deal with the long-ranged and many-body nature of hydrodynamic interactions for low Reynolds number flows. By using such a coupled model, the restructuring of colloidal aggregates under shear flows with stepwise increasing shear rates was studied. Irreversible compaction occurs due to the increase of hydrodynamic stress on clusters. Results show that the greater part of the fractal clusters are compacted to rod-shaped packed structures, while the others show isotropic compaction.

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Section: Model For the Plasticitymentioning

confidence: 99%

“…placements [2,[7][8][9][10][11][26][27][28][29][30][31][32]. These relative displacements are expressed by using position vectors and vectors fixed at respective particles.…”

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confidence: 99%

Restructuring of colloidal aggregates in shear flow

et al. 2012

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“…This force law was implemented in a DEM code extended to account for cohesion in three dimensions [7].…”

Section: Liquid Bridges In Polydisperse Granular Materialsmentioning

confidence: 99%

Influence of liquid bridges on the mechanical behaviour of polydisperse granular materials

Soulié

Cherblanc

Youssoufi

et al. 2006

Int. J. Numer. Anal. Meth. Geomech.

195

137

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SUMMARYWe investigate a polydisperse granular material in which the particle interactions are governed by a capillary force law. The cohesion force for a grain-pair with unequal diameters is expressed as an explicit function of the inter-particle distance and the volume of the liquid bridge. This analytical relation is validated by experiments on a reference material. Then, it is completed by a rupture criterion and cast in the form of a force law that accounts for solid contact, capillary force and rupture characteristics of a grain-pair. Finally, in order to evaluate the influence of capillary cohesion on the macroscopic behaviour, radial and axial compression tests on cylindrical assemblies of wet particles are simulated using a 3D distinct element method.

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“…An attractive bond at each grain contact is implemented thanks to an additional cohesion model between the solid particles which is based on a relatively straightforward rheology (i.e. viscoelasticperfectly-plastic) and on the de-bonding limit (yield) conditions introduced by Delenne and coworkers [3] which permit the consideration of bond ruptures in tension, shear and bending conditions. The second type of model cohesive soils that can be easily studied through systematic investigations are chemically-treated sands, as magic sand and kinetic sand.…”

Section: Model Materialsmentioning

confidence: 99%

Physics of soil erosion at the microscale

Philippe¹,

Cuéllar²,

Brunier-Coulin³

et al. 2017

EPJ Web Conf.

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Abstract. We focus here on the major and still relevant issue of soil erosion by fluid flows, and more specifically on the determination of both a critical threshold for erosion occurrence and a kinetics that specifies the rate of eroded matter entrainment. A state-of-the-art is first proposed with a critical view on the most commonly used methods and erosion models. It is then discussed an alternative strategy, promoting the use of model materials that allow systematic parametric investigations with the purpose of identifying more precisely the local mechanisms responsible for soil particle erosion and ultimately quantifying both critical onsets and kinetics, possibly through existing or novel empirical erosion laws. Finally, we present and discuss several examples following this methodology, implemented either by means of experiments or numerical simulations, and coupling erosion tests in several particular hydrodynamical configurations with wisely selected mechanical tests.

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Mechanical behaviour and failure of cohesive granular materials

Cited by 152 publications

References 22 publications

Restructuring of colloidal aggregates in shear flow

Restructuring of colloidal aggregates in shear flow

Influence of liquid bridges on the mechanical behaviour of polydisperse granular materials

Physics of soil erosion at the microscale

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