Effect of applied interparticle force on the static and dynamic angles of repose of spherical granular material

Forsyth, Anthony; Hutton, S. Raymond; Rhodes, Martin; Osborne, Charles

doi:10.1103/physreve.63.031302

Cited by 31 publications

(22 citation statements)

References 7 publications

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“…The interparticle force can be tuned continuously by varying the strength of the external magnetic field B. This technique has previously been used to study the influence of the cohesion on the packing fraction [17,18] and on the avalanche angle [19] of granular assemblies. The choice of the size of grains (beads) is important: not too small to avoid 'natural' cohesion, not too large to avoid the use of high magnetic field and to remain in powder conditions.…”

Section: Fig 1: (A)mentioning

confidence: 99%

Compaction dynamics of a magnetized powder

2009

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We have investigated experimentally the influence of a magnetic interaction between the grains on the compaction dynamics of a granular pile submitted to a series of taps. The granular material used to perform this study is a mixture of metallic and glass grains. The packing is immersed in an homogeneous external magnetic field. The magnetic field induces an interaction between the metallic grains that constitutes the tunable cohesion. The compaction characteristic time and the asymptotic packing fraction have been measured as a function of the Bond number which is the ratio between the cohesive magnetic force and the grain weight. These measurements have been performed for different fractions of metallic beads in the pile. When the pile is only made of metallic grains, the characteristic compaction time increases as the square root of the Bond number. While the asymptotic packing fraction decreases as the inverse of the Bond number. For mixtures, when the fraction of magnetized grains in the pile is increased, the characteristic time increases while the asymptotic packing fraction decreases. A simple mesoscopic model based on the formation of granular chains along the magnetic field direction is proposed to explain the observed macroscopic properties of the packings.

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Section: Fig 1: (A)mentioning

confidence: 99%

Compaction dynamics of a magnetized powder

2009

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“…Halsey et al have conducted this analysis in more detail, and have predicted that in presence of cohesion forces the failure of the heap should occur at its bottom [16]. Also, the dependency of the avalanche angle with cohesion forces described in (3) has been probed recently by Forsyth et al [24], who have used well controlled magnetic adhesion forces between grains.…”

Section: Figmentioning

confidence: 99%

Aging in humid granular media

et al. 2002

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Aging behaviour is an important effect in the friction properties of solid surfaces. In this paper we investigate the temporal evolution of the static properties of a granular medium by studying the aging over time of the maximum stability angle of submillimetric glass beads. We report the effect of several parameters on these aging properties, such as the wear on the beads, the stress during the resting period, and the humidity content of the atmosphere. Aging effects in an ethanol atmosphere are also studied. These experimental results are discussed at the end of the paper.

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“…Figure 4 shows the typical results of a tensile test of compacted shot, for very long cylindrical shackles. The breaking load and strength are proportional to the square of the magnetization, M, according to the Forsyth [15] observations.…”

Section: Magnetic Particlesmentioning

confidence: 99%

Thermal and mechanical behavior of Al-Si alloy cast using magnetic molding and lost foam processes

Geffroy

Lakehal

Goñi

et al. 2006

Metall Mater Trans A

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Magnetic molding technology is an original alternative process aimed at improving the metallurgical quality and dimensional tolerances of the final components that are currently produced using the lost foam process. The initial development of the magnetic molding process took place at the same time as the lost foam process, more than 30 years ago, but the magnetic molding process has never achieved the same level of industrial development. The purposes of this study are to introduce the magnetic molding process and to define its advantages and characteristics. The comparative results obtained with both the lost foam and the magnetic molding processes for aluminum casting are given. The main factors involved in the magnetic molding process are also discussed.

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Effect of applied interparticle force on the static and dynamic angles of repose of spherical granular material

Cited by 31 publications

References 7 publications

Compaction dynamics of a magnetized powder

Compaction dynamics of a magnetized powder

Aging in humid granular media

Thermal and mechanical behavior of Al-Si alloy cast using magnetic molding and lost foam processes

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