Evolving pore orientation, shape and size in sheared granular assemblies
File(s)Sufian2018_Article_EvolvingPoreOrientationShapeAn.pdf (2.07 MB)
Published version
Author(s)
Sufian, A
Russell, AR
Whittle, AJ
Type
Journal Article
Abstract
This paper presents new insights into the deformation response of sheared granular assemblies by characterising pore space properties from discrete element simulations of monodisperse particle assemblies in two-way cyclic shearing. Individual pores are characterized by a modified Delaunay tessellation, where tetrahedral Delaunay cells can be merged to form polyhedral cells. This leads to a natural partition of the pore space between individual pores with tetrahedral and polyhedral geometry. These are representative of small compact pores and larger well-connected pores, respectively. A scalar measure of pore orientation anisotropy during shearing is introduced. For triaxial shearing, larger pores align in the loading direction, while small pores are aligned perpendicular to the larger pores. Pore anisotropy mobilises at a slower rate than contact anisotropy or macroscopic stress state, and hence, is an important element to characterise in granular assemblies. Further, the distribution of pore volume remains isotropic. Pore shape was found to be a good micro-scale indicator of macroscopic density, with a strong relationship between averaged shape factor and macroscopic void ratio. Combining results for pore shape and orientation reveals an interesting interplay, where large elongated pores were aligned with the loading direction. These results highlight the importance of considering pore space characteristics in understanding the behaviour of granular materials.
Date Issued
2019-02-01
Date Acceptance
2018-11-01
ISSN
1434-5021
Publisher
Springer
Journal / Book Title
Granular Matter
Volume
21
Issue
1
Copyright Statement
© 2018 The Author(s). This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
Identifier
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000451077400001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Subjects
Science & Technology
Technology
Physical Sciences
Materials Science, Multidisciplinary
Mechanics
Physics, Applied
Materials Science
Physics
Pore characterisation
Pore geometry
Orientation tensor
Anisotropy
Shape factor
DIRECTIONAL-DATA
FABRIC TENSORS
STRAIN
MEDIA
DEM
PERMEABILITY
DEFINITION
ANISOTROPY
PACKING
SOILS
0904 Chemical Engineering
0905 Civil Engineering
0913 Mechanical Engineering
Fluids & Plasmas
Publication Status
Published
OA Location
https://link.springer.com/content/pdf/10.1007%2Fs10035-018-0856-4.pdf
Article Number
4
Date Publish Online
2018-11-23