Reorganization of a granular medium around a localized transformation

Merceron, Aymeric; Sauret, Alban; Jop, Pierre

doi:10.1103/physreve.93.062904

Cited by 3 publications

(10 citation statements)

References 36 publications

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“…The corresponding distributions of avalanche sizes exhibit similar profiles ( Fig. 3) to those obtained for a single intruder with a power-law dependence for the largest avalanche sizes [28]. Such observation is characteristic of processes ruled by scale invariance like snow avalanches [31] and earthquakes [32].…”

Section: Phenomenological Observationssupporting

confidence: 72%

Cooperative effects induced by intruders evolving through a granular medium

Merceron¹,

Sauret²,

Jop³

2018

EPL

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Applying mechanical perturbations in a granular assembly may rearrange the configuration of the particles. However, the spatial propagation of an event is not related to the size of the external perturbation alone. Thus, the characteristic length scale of an event is not well defined. In this study, we trigger rearrangements by driving two intruders through a vertical two-dimensional packing of disks. The amplitude of the rearrangements of the granular assembly appearing around the two evolving intruders is related to their separating distances. We show that there exists a characteristic distance between intruders under which the dynamics of the grains above one intruder is influenced by the other. The size of the intruders has little effect on this characteristic length. Finally, we show that the correlation between the movements of the grains decreases with the distance away from the intruders over a larger length scale. arXiv:1805.09093v1 [physics.flu-dyn]

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Section: Phenomenological Observationssupporting

confidence: 72%

Cooperative effects induced by intruders evolving through a granular medium

Merceron¹,

Sauret²,

Jop³

2018

EPL

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“…The main qualitative features observed with a large intruder [16] are not significantly modified when reducing the intruder width and we still find a broad distribution of the rearrangement amplitude. To characterize quantitatively the reorganization of the granular medium, we define the ava-lanche size N A as the number of disks whose absolute displacement is larger than the displacement of the intruder between twotime steps (d g /16).…”

Section: Short-term Rearrangementsmentioning

confidence: 56%

“…We also perform numerical simulation using LMGC90, a discrete element software to explore more configurations [18,16,17]. We measured experimentally the particle-particle and particle-wall dynamical friction coefficients, µ = 0.13, and used the same value in the numerical simulation.…”

Section: Methodsmentioning

confidence: 99%

“…Indeed, the probability of jamming is smaller for a large intruder, which results in a smaller probability of large avalanche size. It also leads to the apparition of a maximum of the distribution at a value close to the number of disks in contact with the tip of the intruder [16]. Finally, the formation of arches modifies the global shape of the avalanche size distribution.…”

Section: Short-term Rearrangementsmentioning

confidence: 99%

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Influence of the size of the intruder on the reorganization of a 2D granular medium

2019

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We consider the rearrangements of a vertical twodimensional granular packing induced by the withdrawal of an intruder. Here, we focus on the influence of the size of the intruder on the reorganization process. The long term evolution of the granular packing is investigated as well as the avalanche dynamics that characterize the short term rearrangements around the intruder. For small enough intruder, we observe the formation of arches that periodically destabilize and influence the reorganization dynamics of the twodimensional packing through larger rearrangement events. arXiv:1907.10924v1 [cond-mat.soft]

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“…The complex behavior of granular flows has recently been studied through its interaction with rigid intruders [21][22][23][24][25][26][27][28][29][30][31][32][33]. The high sensitivity of flexible intruders to low forces opens here a promising new way of probing the mechanical behavior of granular media [34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Bending transition in the penetration of a flexible intruder in a two-dimensional dense granular medium

et al. 2018

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We study the quasi-static penetration of a flexible beam in a two-dimensional dense granular medium lying on an horizontal plate. Rather than a buckling-like behavior we observe a transition between a regime of crack-like penetration in which the fiber only shows small fluctuations around a stable straight geometry and a bending regime in which the fiber fully bends and advances through series of loading/unloading steps. We show that the shape reconfiguration of the fiber is controlled by a single non dimensional parameter: L/Lc, the ratio of the length of the flexible beam L to Lc, a bending elasto-granular length scale that depends on the rigidity of the fiber and on the departure from the jamming packing fraction of the granular medium. We show moreover that the dynamics of the bending transition in the course of the penetration experiment is gradual and is accompanied by a symmetry breaking of the granular packing fraction in the vicinity of the fiber. Together with the progressive bending of the fiber, a cavity grows downstream of the fiber and the accumulation of grains upstream of the fiber leads to the development of a jammed cluster of grains. We discuss our experimental results in the framework of a simple model of bending-induced compaction and we show that the rate of the bending transition only depends on the control parameter L/Lc.

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Reorganization of a granular medium around a localized transformation

Cited by 3 publications

References 36 publications

Cooperative effects induced by intruders evolving through a granular medium

Cooperative effects induced by intruders evolving through a granular medium

Influence of the size of the intruder on the reorganization of a 2D granular medium

Bending transition in the penetration of a flexible intruder in a two-dimensional dense granular medium

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