Aging in humid granular media

Restagno, Frédéric; Ursini, Cécile; Gayvallet, H.; Charlaix, Élisabeth

doi:10.1103/physreve.66.021304

Cited by 26 publications

(28 citation statements)

References 29 publications

(40 reference statements)

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“…The most famous and common example of such interaction force is the adhesive force induced by moisture through capillarity in granular media. It has been observed and measured that even a small amount of liquid added to a granular medium drastically changes its mechanical properties [1][2][3][4][5][6][7]. But these changes are not completely understood.…”

Section: Introductionmentioning

confidence: 96%

“…In particular, the increase of the MAS cannot be explained by considering simple liquid bridges between ideally smooth particles. Many other questions remain unanswered such as the consequences of the plastic deformation of the particles or the effects of humidity induced ageing [4][5][6][7]. Beside the difficulties of the theoretical approaches, the experiments are rather tricky.…”

Section: Introductionmentioning

confidence: 97%

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Cohesion induced by a rotating magnetic field in a granular material

Peters

Lemaire

2004

Phys. Rev. E

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We report experiments on a magnetic cohesive granular material made of steel spheres in the millimeter range. A magnetic field magnetizes the spheres, so that an interaction force between grains appears. A rotating magnetic field is applied parallel to plane of the quasi-two-dimensional cell containing the spheres so that only the time averaged force between two particles will be considered. Both maximum angle of stability and angles of repose are measured. The maximum angle of stability is found to depend linearly on the interaction force. Another noticeable feature is the lack of dependence of the maximum angle of stability on the initial height of the heap. We show that the angle of repose is less sensitive to the magnetic interaction force than the maximum of stability. At last, we discuss the importance of using a rotating field rather than a constant one. In particular, we report some measurements of both the maximum angle of stability and the angle of repose in constant field, which show a strong dependence of the angles of avalanche on the direction of the field.

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Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 97%

Cohesion induced by a rotating magnetic field in a granular material

Peters

Lemaire

2004

Phys. Rev. E

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“…Underlying this phenomenon, interstitial liquid bridges form between particles through capillary action resulting in increased interparticle cohesion [5][6][7][8] and modified sliding friction [9][10][11]. Several studies have focused on interparticle forces of either granular assemblies or individual particles as a function of humidity or liquid content [4,5,12,13], aging time [5,13], resting angle [13], particle size [4,13], and solvent chemistry [12,13]. Quantifying the interparticle interactions is an important step in understanding the bulk mechanics of granular media.…”

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confidence: 99%

Capillary Aging of the Contacts between Glass Spheres and a Quartz Resonator Surface

et al. 2006

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The strength of the contacts between small glass spheres and the surface of a quartz crystal resonator has been probed based on the increase of resonance frequency induced upon sphere contact. The acoustic interaction between the sphere and the plate is modeled as a low-frequency coupled resonance; the dependence of the resonant parameters on overtone order lends support to this model. After exposing the sample to humid air and drying it again, the contact strength increases at least tenfold due to capillary forces--we observe a hysteretic form of the sand-castle effect. Repeated wet-dry cycles reveal logarithmic capillary aging with time. The experiments suggest that the drying of the liquid bridges leads to a contraction of small voids in the contact zone, subsequently increasing cohesion.

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“…A number of studies have focused on the dynamics of wet granular avalanches [21] and on the effect of humidity [22][23][24] and capillary forces [15,25,26] on the static properties of granulates in both engineering applications [23] and natural systems (e.g., soil) [27]. A number of different models have been proposed to study the geometric stability of wet piles, including Mohr-Coulomb continuum [28], liquid-bridge [15], and response function [16,29,30] models.…”

Section: Introductionmentioning

confidence: 99%

Flow-induced shear instabilities of cohesive granulates

Battiato

Vollmer

2012

Phys. Rev. E

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In this work we use a multiscale framework to calculate the fluidization threshold of three-dimensional cohesive granulates under shear forces exerted by a creeping flow. A continuum model of flow through porous media provides an analytical expression for the average drag force on a single grain. The balance equation for the forces and a force propagation model are then used to investigate the effects of porosity and packing structure on the stability of the pile. We obtain a closed-form expression for the instability threshold of a regular packing of monodisperse frictionless cohesive spherical grains in a planar fracture. Our result quantifies the compound effect of structural (packing orientation and porosity) and dynamical properties of the system on its stability.

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Aging in humid granular media

Cited by 26 publications

References 29 publications

Cohesion induced by a rotating magnetic field in a granular material

Cohesion induced by a rotating magnetic field in a granular material

Capillary Aging of the Contacts between Glass Spheres and a Quartz Resonator Surface

Flow-induced shear instabilities of cohesive granulates

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