Local rheological measurements in the granular flow around an intruder

Seguin, Antoine; Coulais, Corentin; Martínez, Francisco; Bertho, Yann; Gondret, Philippe

doi:10.1103/physreve.93.012904

Cited by 43 publications

(45 citation statements)

References 40 publications

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“…Although we calculate F á ñ by averaging the instantaneous force acting on the rod in the steady state regime, N jam should be measured using this scheme instead of simple hydrostatic form. In addition, we compute the stress tensor for each particle including the ones conforming rod as follows (by assuming ith particle has a diameter D i and is in contact with jth particle) [31],…”

Section: Numerical Resultsmentioning

confidence: 99%

Packing-dependent granular friction exerted on a rod withdrawn from a granular layer: the role of shear jamming

et al. 2019

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Resistance force acting on a rod vertically withdrawn from a granular layer is studied by experiments and numerical simulations. The initial packing fraction of the granular layer is controlled to evaluate the packing dependence of the resistance force. In both experiments and numerical simulations, the frictional resistance force in the steady slipping regime increases as the initial packing fraction is increased. According to the numerical results, the principal reason for the increase of frictional resistance is the increase of normal force acting on the rod. This large normal force stems from the effective solidification of the granular layer which is caused by the shearing induced by the withdrawn rod. Based on this shear-induced solidification, the experimental data are analyzed using a simple 'cylindrical shear-jammed zone' model. Then, the critical divergence of the size of solidified (shearjammed) zone is observed by increasing the initial packing fraction towards the jamming packing fraction.

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Section: Numerical Resultsmentioning

confidence: 99%

Packing-dependent granular friction exerted on a rod withdrawn from a granular layer: the role of shear jamming

et al. 2019

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“…that are typically used to apply stress. Recent granular point-load studies have focused on the dynamical response of a single-grain intruder, mostly in quasi-two-dimensional (2D) beds of disks [9][10][11][12][13][14]. In all cases, the dynamics is affected by the packing fraction and the strength of the driving mechanism, whether the intruder is driven at a constant velocity, by a constant force, or by a continually loading spring.…”

Section: Introductionmentioning

confidence: 99%

Intruder in a two-dimensional granular system: Effects of dynamic and static basal friction on stick-slip and clogging dynamics

et al. 2020

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We discuss the results of simulations of an intruder pulled through a two-dimensional granular system by a spring, using a model designed to lend insight into the experimental findings described by Kozlowski et al. [Phys. Rev. E 100, 032905 (2019)]. In that previous study the presence of basal friction between the grains and the base was observed to change the intruder dynamics from clogging to stick-slip. Here we first show that our simulation results are in excellent agreement with the experimental data for a variety of experimentally accessible friction coefficients governing interactions of particles with each other and with boundaries. Then, we use simulations to explore a broader range of parameter space, focusing on the friction between the particles and the base. We consider a range of both static and dynamic basal friction coefficients, which are difficult to vary smoothly in experiments. The simulations show that dynamic friction strongly affects the stick-slip behaviour when the coefficient is decreased below 0.1, while static friction plays only a marginal role in the intruder dynamics.

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“…Recent studies show that an intruder penetrating a granular medium exhibits both position and velocity fluctuations due to formation and buckling of force chains [1,2,3,4,5]. At constant force mode-using force feedback mechanism, intruder displacements were found to exhibit large fluctuations in the direction of the dragging force.…”

Section: Introductionmentioning

confidence: 99%

Applying fluctuation theorem on position fluctuations of an intruder penetrating a 2D wet granular medium near jamming state

Bonachita

Confesor

2017

AIP Conference Proceedings

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Abstract. We monitor the position of an intruder penetrating a two-dimensional mono-disperse granular assembly near the jamming state. We employ the Fluctuation Theorem (FT) to characterize the fluctuation in the intruder position. The FT takes the form:where Δx τ is the displacement of the intruder after a time interval τ, Π(Δx τ ) is the probability distribution of Δx τ , and F τ is a functional. Our results showed that FT was obeyed for all the intruder driving speeds used in our study and that F τ converges to F at long time scale. Furthermore, a linear dependence of F with the driving speed was measured in agreement to previous experiments.

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Local rheological measurements in the granular flow around an intruder

Cited by 43 publications

References 40 publications

Packing-dependent granular friction exerted on a rod withdrawn from a granular layer: the role of shear jamming

Packing-dependent granular friction exerted on a rod withdrawn from a granular layer: the role of shear jamming

Intruder in a two-dimensional granular system: Effects of dynamic and static basal friction on stick-slip and clogging dynamics

Applying fluctuation theorem on position fluctuations of an intruder penetrating a 2D wet granular medium near jamming state

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