Systematic description of the effect of particle shape on the strength properties of granular media

© The Authors, published by EDP Sciences, 2017. In this paper, we explore numerically the effect of particle shape on the mechanical behavior of sheared granular packings. In the framework of the Contact Dynamic (CD)Method, we model angular shape as irregular polyhedral particles, non-convex shape a...

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Main Authors: Emilien Azéma, Nicolas Estrada, Itthichai Preechawuttipong, Jean Yves Delenne, Farhang Radjai
Format: Conference Proceeding
Published: 2018
Online Access:https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85024108422&origin=inward
http://cmuir.cmu.ac.th/jspui/handle/6653943832/47132
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Institution: Chiang Mai University
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spelling th-cmuir.6653943832-471322018-04-25T07:23:21Z Systematic description of the effect of particle shape on the strength properties of granular media Emilien Azéma Nicolas Estrada Itthichai Preechawuttipong Jean Yves Delenne Farhang Radjai © The Authors, published by EDP Sciences, 2017. In this paper, we explore numerically the effect of particle shape on the mechanical behavior of sheared granular packings. In the framework of the Contact Dynamic (CD)Method, we model angular shape as irregular polyhedral particles, non-convex shape as regular aggregates of four overlapping spheres, elongated shape as rounded cap rectangles and platy shape as square-plates. Binary granular mixture consisting of disks and elongated particles are also considered. For each above situations, the number of face of polyhedral particles, the overlap of spheres, the aspect ratio of elongated and platy particles, are systematically varied from spheres to very angular, non-convex, elongated and platy shapes. The level of homogeneity of binary mixture varies from homogenous packing to fully segregated packings. Our numerical results suggest that the effects of shape parameters are nonlinear and counterintuitive. We show that the shear strength increases as shape deviate from spherical shape. But, for angular shapes it first increases up to a maximum value and then saturates to a constant value as the particles become more angular. For mixture of two shapes, the strength increases with respect of the increase of the proportion of elongated particles, but surprisingly it is independent with the level of homogeneity of the mixture. A detailed analysis of the contact network topology, evidence that various contact types contribute differently to stress transmission at the micro-scale. 2018-04-25T07:23:21Z 2018-04-25T07:23:21Z 2017-06-30 Conference Proceeding 2100014X 21016275 2-s2.0-85024108422 10.1051/epjconf/201714006026 https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85024108422&origin=inward http://cmuir.cmu.ac.th/jspui/handle/6653943832/47132
institution Chiang Mai University
building Chiang Mai University Library
country Thailand
collection CMU Intellectual Repository
description © The Authors, published by EDP Sciences, 2017. In this paper, we explore numerically the effect of particle shape on the mechanical behavior of sheared granular packings. In the framework of the Contact Dynamic (CD)Method, we model angular shape as irregular polyhedral particles, non-convex shape as regular aggregates of four overlapping spheres, elongated shape as rounded cap rectangles and platy shape as square-plates. Binary granular mixture consisting of disks and elongated particles are also considered. For each above situations, the number of face of polyhedral particles, the overlap of spheres, the aspect ratio of elongated and platy particles, are systematically varied from spheres to very angular, non-convex, elongated and platy shapes. The level of homogeneity of binary mixture varies from homogenous packing to fully segregated packings. Our numerical results suggest that the effects of shape parameters are nonlinear and counterintuitive. We show that the shear strength increases as shape deviate from spherical shape. But, for angular shapes it first increases up to a maximum value and then saturates to a constant value as the particles become more angular. For mixture of two shapes, the strength increases with respect of the increase of the proportion of elongated particles, but surprisingly it is independent with the level of homogeneity of the mixture. A detailed analysis of the contact network topology, evidence that various contact types contribute differently to stress transmission at the micro-scale.
format Conference Proceeding
author Emilien Azéma
Nicolas Estrada
Itthichai Preechawuttipong
Jean Yves Delenne
Farhang Radjai
spellingShingle Emilien Azéma
Nicolas Estrada
Itthichai Preechawuttipong
Jean Yves Delenne
Farhang Radjai
Systematic description of the effect of particle shape on the strength properties of granular media
author_facet Emilien Azéma
Nicolas Estrada
Itthichai Preechawuttipong
Jean Yves Delenne
Farhang Radjai
author_sort Emilien Azéma
title Systematic description of the effect of particle shape on the strength properties of granular media
title_short Systematic description of the effect of particle shape on the strength properties of granular media
title_full Systematic description of the effect of particle shape on the strength properties of granular media
title_fullStr Systematic description of the effect of particle shape on the strength properties of granular media
title_full_unstemmed Systematic description of the effect of particle shape on the strength properties of granular media
title_sort systematic description of the effect of particle shape on the strength properties of granular media
publishDate 2018
url https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85024108422&origin=inward
http://cmuir.cmu.ac.th/jspui/handle/6653943832/47132
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