Microstructural characteristics of planar granular solids

Matsushima, Takashi; Blumenfeld, Raphaël

doi:10.1063/1.4811933

Cited by 3 publications

(2 citation statements)

References 17 publications

(24 reference statements)

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“…We think this is due to the higher friction between particles in the experiments, possibly aggravated by slight nonsphericities in particle shape. The influence of the friction coefficient on the solid fraction can be found in [26].…”

Section: Simulation Settingsmentioning

confidence: 99%

Numerical investigation of the vertical plunging force of a spherical intruder into a prefluidized granular bed

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Kuipers

2014

Phys. Rev. E

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The plunging of a large intruder sphere into a prefluidized granular bed with various constant velocities and various sphere diameters is investigated using a state-of-the-art hybrid discrete particle and immersed boundary method, in which both the gas-induced drag force and the contact force exerted on the intruder can be investigated separately. We investigate low velocities, where velocity dependent effects first begin to appear. The results show a concave-to-convex dependence of the plunging force as a function of intruder depth. In the concave region the force fits to a power law with an exponent around 1.3, which is in good agreement with existing experimental observations. Our simulation results further show that the force exerted on the frontal hemisphere of the intruder is dominant. At larger intruder velocities, friction with the granular medium causes a velocity-dependent drag force. As long as the granular particles have not yet closed the gap behind the intruder, this drag force is independent of the actual intruder depth. In this regime, the drag force experienced by intruders of different diameter moving at different velocities all fall onto a single master curve if plotted against the Reynolds number, using a single value for the effective viscosity of the granular medium. This master curve corresponds well to the Schiller-Naumann correlation for the drag force between a sphere and a Newtonian fluid. After the gap behind the intruder has closed, the drag force increases not only with velocity but also with depth. We attribute this to the effect of increasing hydrostatic particle pressure in the granular medium, leading to an increase in effective viscosity.

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Section: Simulation Settingsmentioning

confidence: 99%

Numerical investigation of the vertical plunging force of a spherical intruder into a prefluidized granular bed

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Kuipers

2014

Phys. Rev. E

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“…Research by Blumenfeld and colleagues have concentrated on defining the material parameters for granular beds in terms of 'quadrons' [17][18][19]. The basic idea is to use the centre of the pore as a reference point and map out the contact points around that pore and the centres of mass of the grains, figure 8(a).…”

Section: Defining the Initial State Of The Granular Materialmentioning

confidence: 99%

The stress and ballistic properties of granular materials

Proud

Chapman

Eakins

2017

AIP Conference Proceedings

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Abstract. Granular materials are widespread in nature and in manufacturing. Their particulate nature gives a compressive strength of a similar order of magnitude as many continuous solids, a vanishingly small tensile strength and variable shear strength, highly dependent on the loading conditions. Previous studies have shown the effect of composition, morphology and particle size, however, compared to metals and polymers, granular materials are not so well understood. This paper will present some recent results for granular materials, placing these within the wider context. Two areas will be dealt with (i) the effect of the skeletal strength of the material and (ii) the displacements associated with ballistic impact. One clear observation is the similarity of behavior of quartz-sands in compression across a range of particle size. However, the precise pathway of compression is strongly dependent on the initial conditions e.g. density and connectivity within the granular bed, as emphasized by some data for quasi-static compression of sand. To fully embrace the range of behaviours seen requires the development of a suitable parameter to describe the material, the paper concludes with a discussion of one of those approaches.

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Rheological and Microstructural Characteristics in Granular Shear Flow of 2d Elliptical Particles

Jiang

Matsushima

2021

J. JSCE

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Microstructural characteristics of planar granular solids

Cited by 3 publications

References 17 publications

Numerical investigation of the vertical plunging force of a spherical intruder into a prefluidized granular bed

Numerical investigation of the vertical plunging force of a spherical intruder into a prefluidized granular bed

The stress and ballistic properties of granular materials

Rheological and Microstructural Characteristics in Granular Shear Flow of 2d Elliptical Particles

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