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The effect of particle elongation on the strength of granular materials

The effect of particle elongation on the strength of granular materials
The effect of particle elongation on the strength of granular materials
It has long been recognised that the macroscopic mechanical behaviour of a granular material depends on particle shape. However, a systematic investigation into particle shape is lacking. Particle shape is commonly split into the independent categories of form, angularity and roughness. The form of a particle can be quantified using the Longest (L), Intermediate (I) and Shortest (S) dimension of an equivalent scalene ellipsoid; two independent parameters of particle form are defined, termed platyness and elongation.

We use DEM simulations with the Potential Particle Method to investigate the effect of particle form on the friction angle of a granular material at critical state. It is found that deviation of particle form from that of a sphere leads to higher angles of friction at critical state. It is argued that, to some extent, the higher critical state strength exhibited by non-spherical particles is due to form suppressing particle rotation and leading to increased interparticle sliding, a mechanism that in comparison requires more energy to be expended.
form, granular materials, DEM, ballast, shape
239-242
Potticary, Matthew
2828c807-6a58-4861-a744-3c955749d2aa
Zervos, Antonios
9e60164e-af2c-4776-af7d-dfc9a454c46e
Harkness, John
026f02e8-41d9-403f-83be-0d880058ecf1
Potticary, Matthew
2828c807-6a58-4861-a744-3c955749d2aa
Zervos, Antonios
9e60164e-af2c-4776-af7d-dfc9a454c46e
Harkness, John
026f02e8-41d9-403f-83be-0d880058ecf1

Potticary, Matthew, Zervos, Antonios and Harkness, John (2016) The effect of particle elongation on the strength of granular materials. 24th Conference on Computational Mechanics, United Kingdom. 31 Mar - 01 Apr 2016. 4 pp, pp. 239-242.

Record type: Conference or Workshop Item (Paper)

Abstract

It has long been recognised that the macroscopic mechanical behaviour of a granular material depends on particle shape. However, a systematic investigation into particle shape is lacking. Particle shape is commonly split into the independent categories of form, angularity and roughness. The form of a particle can be quantified using the Longest (L), Intermediate (I) and Shortest (S) dimension of an equivalent scalene ellipsoid; two independent parameters of particle form are defined, termed platyness and elongation.

We use DEM simulations with the Potential Particle Method to investigate the effect of particle form on the friction angle of a granular material at critical state. It is found that deviation of particle form from that of a sphere leads to higher angles of friction at critical state. It is argued that, to some extent, the higher critical state strength exhibited by non-spherical particles is due to form suppressing particle rotation and leading to increased interparticle sliding, a mechanism that in comparison requires more energy to be expended.

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More information

e-pub ahead of print date: March 2016
Published date: April 2016
Venue - Dates: 24th Conference on Computational Mechanics, United Kingdom, 2016-03-31 - 2016-04-01
Keywords: form, granular materials, DEM, ballast, shape
Organisations: Infrastructure Group

Identifiers

Local EPrints ID: 394124
URI: https://eprints.soton.ac.uk/id/eprint/394124
PURE UUID: 1c9de4d1-a459-4f38-b13c-8569ab7b4327
ORCID for Matthew Potticary: ORCID iD orcid.org/0000-0003-2208-8640
ORCID for Antonios Zervos: ORCID iD orcid.org/0000-0002-2662-9320
ORCID for John Harkness: ORCID iD orcid.org/0000-0001-7598-0080

Catalogue record

Date deposited: 17 May 2016 11:19
Last modified: 19 Jun 2018 00:34

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