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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th-cmuir.6653943832-579052018-09-05T03:53:15Z 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 Physics and Astronomy © 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. 2018-09-05T03:53:15Z 2018-09-05T03:53:15Z 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/6653943832/57905 |
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Physics and Astronomy 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 |
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© 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 |
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 |
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https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85024108422&origin=inward http://cmuir.cmu.ac.th/jspui/handle/6653943832/57905 |
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