Creep Motion of a Granular Pile Induced by Thermal Cycling

Divoux, Thibaut; Gayvallet, H.; Géminard, Jean‐Christophe

doi:10.1103/physrevlett.101.148303

Cited by 58 publications

(94 citation statements)

References 21 publications

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“…7b) is characterized by very small oscillations of a period T = 6.10 −4 s. These small oscillations are due to the regulation of the room and the cell temperature ±0.5 • C). Similar observations were reported in other granular materials (Divoux et al 2008). …”

Section: Crack Network Of a Thermally Cracked Sample Deformed Under Ssupporting

confidence: 82%

Evolution of the crack network in glass samples submitted to brittle creep conditions

et al. 2014

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A crack network is introduced in glass by quenching heated samples. The sharp variation of temperature at the sample boundaries leads to tensile stresses that nucleate cracks. Then, they propagate in the entire sample. Quenching has been performed at 100, 200 and 300 • C. Cracks have been imaged with a scanning electron microscope. A transverse isotropic crack network is observed. Crack length and orientation have been measured. Obtained crack density has been compared to that inferred from elastic wave velocity measurements using effective medium theory. Cracked samples have been then submitted to creep tests. Two samples have been recovered, one before its failure and another after. Our observations show that vertical crack propagation takes place during brittle creep and that tertiary creep leads to a localized failure in a shear plane. The damaged and post-mortem microstructural networks have been documented.

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Section: Crack Network Of a Thermally Cracked Sample Deformed Under Ssupporting

confidence: 82%

Evolution of the crack network in glass samples submitted to brittle creep conditions

et al. 2014

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“…The quantity of hydrogen absorbed (wt%) by this material is smaller than that expected based on the literature on TieCreV (3.5 wt% [16]) and by comparison with other hydrides with a TiCrV base [22e25]. This can be explained firstly by the fairly significant presence of ZreNi which improves activation and kinetics but reduces the absorption capacity.…”

mentioning

confidence: 70%

“…This phenomenon can be attributed to gradual densification of the powder corresponding to a rearrangement of the grains relative to their initial state. While the swelling of granular media in a container (and the rearrangement that it causes) has been investigated somewhat in other fields such as, for example, in the context of thermal expansion [16], it has been very little investigated in the context of hydrogen storage by hydrides.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of the swelling/shrinkage of a hydride bed in a cell during hydrogen absorption/desorption cycles

Charlas

Gillia

Dorémus

et al. 2012

International Journal of Hydrogen Energy

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“…Among those are shaking [6,7] fluid-or air-flow [8][9][10], cyclic shear [11,12] or temperature oscillations [13,14]. We describe a two-dimensional system, similar to the setup used in Refs.…”

Section: Pacs Numbersmentioning

confidence: 99%

Melting a Granular Glass by Cooling

Plagge

Heussinger

2013

Phys. Rev. Lett.

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Driven granular systems readily form glassy phases at high particle volume fractions and low driving amplitudes. We use computer simulations of a driven granular glass to evidence a re-entrance melting transition into a fluid state, which, contrary to intuition, occurs by reducing the amplitude of the driving. This transition is accompanied by anomalous particle dynamics and super-diffusive behavior on intermediate time-scales. We highlight the special role played by frictional interactions, which help particles to escape their glassy cages. Such an effect is in striking contrast to what friction is expected to do: reduce particle mobility by making them stick. PACS numbers:Friction implies stability. A solid block only remains static on an inclined plane because there is friction with the underlying surface. Similarly, a heap made of granular particles, in general, will have a higher angle of stability with increased friction coefficient [1]. Inside the heap, the particle volume fraction will generally be lower and the number of inter-particle contacts smaller, while the heap nevertheless remains stable [2]. A similar stabilization occurs when the grains are driven into a fluid state. Under shear, the jamming transition from a freely flowing state to a yield-stress fluid occurs at lower volume fractions as compared to the frictionless case [3][4][5].Here, we present simulations of a driven granular system were friction acts opposite to what is expected from these simple examples. We show how friction can lead to anomalous particle dynamics that very efficiently fluidize the system. As a result the system undergoes a re-entrance melting transition from a glassy to a fluid state by lowering the amplitude of driving.Experimentally, a variety of driving mechanisms have been proposed to characterize the dynamical properties of dense granular systems. Among those are shaking [6,7] fluid-or air-flow [8][9][10], cyclic shear [11,12] or temperature oscillations [13,14]. We describe a two-dimensional system, similar to the setup used in Refs. [6,9,10,15]. At high densities and low enough driving amplitude these systems readily form glassy states, where structural relaxation is completely suppressed [16]. Interestingly, Ref.[15] also reports anomalous particle dynamics deep in the glassy phase, and suspects friction to play a central role in this process. Unfortunately, it is rather difficult experimentally to quantitatively characterize or tune the frictional interactions between the particles [17] or between particles and container walls. The connection between friction and particle dynamics is therefore unclear. Our simulations have the goal to elucidate such a connection.Model -We consider a monolayer of N = 2500 disks. One half of the particles ("small") have radius R s = 0.5d and mass m s = ρ(4π/3)R 2 , where L is the size of the simulation box. Unless otherwise stated we fix φ = 0.825, which is only slightly below the random close packing value of φ c = 0.84. Periodic boundary conditions are used in both directions...

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Creep Motion of a Granular Pile Induced by Thermal Cycling

Cited by 58 publications

References 21 publications

Evolution of the crack network in glass samples submitted to brittle creep conditions

Evolution of the crack network in glass samples submitted to brittle creep conditions

Experimental investigation of the swelling/shrinkage of a hydride bed in a cell during hydrogen absorption/desorption cycles

Melting a Granular Glass by Cooling

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