Effect of lateral confinement on the apparent mass of granular dampers

Ferreyra, María Victoria; Baldini, M; Pugnaloni, Luis A.; Job, Stéphane

doi:10.1007/s10035-021-01090-w

Cited by 4 publications

(3 citation statements)

References 34 publications

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“…This stems from the asymmetry introduced by the gravity field (see the motions in Fig. S5 in the Supplementary Information ), in addition to the inelastic rebound at the collision between the free-falling granular lattice and the bottom of the container 57 . Consistently, we observe that unlike the vertical velocity distribution, the distribution of the horizontal velocity fluctuations is better centered in both examples.…”

Section: Resultsmentioning

confidence: 99%

“…More recently, the role of the energy dissipation 49 and of the container’s roughness 50 have been investigated, demonstrating that particles inelasticity 49 and surface topography 50 both have the ability to alter the nature and the order of the solid–liquid transition, from a two-step continuous one (involving an intermediate hexatic phase) to a discontinuous first-order-like one (involving an intermediate state where liquid and solid coexist). Practically, understanding how to control the amount of disorder and agitation of particles is meaningful in contexts relevant to industrial processing of granular materials, like segregation and mixing of seeds and pills 51 , 52 or vibrations mitigation 53 – 57 , for instance. Here, our objective is twofold.…”

Section: Introductionmentioning

confidence: 99%

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Geometry-controlled phase transition in vibrated granular media

Zuñiga

Varas

Job

2022

Sci Rep

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We report experiments on the dynamics of vibrated particles constrained in a two-dimensional vertical container, motivated by the following question: how to get the most out of a given external vibration to maximize internal disorder (e.g. to blend particles) and agitation (e.g. to absorb vibrations)? Granular media are analogs to classical thermodynamic systems, where the injection of energy can be achieved by shaking them: fluidization arises by tuning either the amplitude or the frequency of the oscillations. Alternatively, we explore what happens when another feature, the container geometry, is modified while keeping constant the energy injection. Our method consists in modifying the container base into a V-shape to break the symmetries of the inner particulate arrangement. The lattice contains a compact hexagonal solid-like crystalline phase coexisting with a loose amorphous fluid-like phase, at any thermal agitation. We show that both the solid-to-fluid volume fraction and the granular temperature depend not only on the external vibration but also on the number of topological defects triggered by the asymmetry of the container. The former relies on the statistics of the energy fluctuations and the latter is consistent with a two-dimensional melting transition described by the KTHNY theory.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Geometry-controlled phase transition in vibrated granular media

Zuñiga

Varas

Job

2022

Sci Rep

Self Cite

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“…The fact that the bed expands as the piston is removed also reveals an elastic response of the magnetic bed that, together with the smooth increase of the force load without marked force drops, are features that can be exploited to design a new type of granular damper. A granular damper is a device used to attenuate mechanical vibrations based on the dissipative nature of granular materials [22,23], where kinetic energy is dissipated through friction and collisions between particles. These devices have been used to attenuate the vibrations of oscillatory tools [24] and impacts [25].…”

Section: Discussionmentioning

confidence: 99%

Experimental and numerical investigation of the compression and expansion of a granular bed of repelling magnetic disks

et al. 2022

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We studied experimentally and numerically the compaction and subsequent expansion dynamics of a granular bed composed of cylindrical repelling magnets contained in a two-dimensional cell. The particles are firstly compressed vertically with a piston at a given strain rate until a maximum force is reached. The piston is then removed at the same strain rate while the bed expands due to the magnetic repulsion of the particles. In the experiments, two different initial configurations were generated, a standard and a loose packing bed. The standard packing bed was simulated, and modelling the dry friction between the magnetic particles and the walls of the cell was crucial for the correct description of the compression and expansion dynamics. We found that the force acting on the piston increases continuously and exponentially with the piston stroke during compression, being very sensitive to the initial packing conditions of the bed. In contrast, a history-independent exponential decrease of this force was found during the expansion phase. The hysteresis in the system was quantified in terms of the average displacement of the particles. The continuous compression contrasts with the sudden force drops observed during the compaction of granular materials with direct particle-particle contacts, where stick-slip motion is induced by friction and force chain breakage. Moreover, we found that the short range of magnetic interaction induces density inversion and crystallization of the system. Our results can be useful to develop a new kind of magnetic granular dampers.

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Granular binary mixtures improve energy dissipation efficiency of granular dampers

Varela-Rosales¹,

Santarossa²,

Engel³

et al. 2023

Granular Matter

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Granular dampers are systems used to attenuate undesired vibrations produced by mechanical devices. They consist of cavities filled by granular particles. In this work, we consider a granular damper filled with a binary mixture of frictionless spherical particles of the same material but different size using numerical discrete element method simulations. We show that the damping efficiency is largely influenced by the composition of the binary mixture.

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Effect of lateral confinement on the apparent mass of granular dampers

Cited by 4 publications

References 34 publications

Geometry-controlled phase transition in vibrated granular media

Geometry-controlled phase transition in vibrated granular media

Experimental and numerical investigation of the compression and expansion of a granular bed of repelling magnetic disks

Granular binary mixtures improve energy dissipation efficiency of granular dampers

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