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Compaction of granular material inside confined geometries / Benjy Marks, Bjørnar Sandnes, Guillaume Dumazer, Jon A. Eriksen, Knut J. Måløy, Bjornar Sandnes

Frontiers in Physics, Volume: 3

Swansea University Author: Bjornar Sandnes

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Abstract

In both nature and engineering, loosely packed granular materials are often compacted inside confined geometries. Here, we explore such behaviour in a quasi-two dimensional geometry, where parallel rigid walls provide the confinement. We use the discrete element method to investigate the stress dist...

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Published in: Frontiers in Physics
ISSN: 2296-424X
Published: 2015
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa21489
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Abstract: In both nature and engineering, loosely packed granular materials are often compacted inside confined geometries. Here, we explore such behaviour in a quasi-two dimensional geometry, where parallel rigid walls provide the confinement. We use the discrete element method to investigate the stress distribution developed within the granular packing as a result of compaction due to the displacement of a rigid piston. We observe that the stress within the packing increases exponentially with the length of accumulated grains, and show an extension to current analytic models which fits the measured stress. The micromechanical behaviour is studied for a range of system parameters, and the limitations of existing analytic models are described. In particular, we show the smallest sized systems which can be treated using existing models. Additionally, the effects of increasing piston rate, and variations of the initial packing fraction, are described.
Keywords: Granular materials, DEM, Janssen effect, Force chains
College: College of Engineering