Effects of shape and size polydispersity on strength properties of granular materials
By means of extensive contact dynamics simulations, we analyze the combined effects of polydispersity both in particle size and in particle shape, defined as the degree of shape irregularity, on the shear strength and microstructure of sheared granular materials composed of pentagonal particles. We...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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American Physical Society
2015
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| Online Access: | http://hdl.handle.net/1721.1/96287 |
| _version_ | 1811085390500593664 |
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| author | Nguyen, Duc-Hanh Azema, Emilien Sornay, Philippe Radjai, Franck |
| author2 | Massachusetts Institute of Technology. Department of Civil and Environmental Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Civil and Environmental Engineering Nguyen, Duc-Hanh Azema, Emilien Sornay, Philippe Radjai, Franck |
| author_sort | Nguyen, Duc-Hanh |
| collection | MIT |
| description | By means of extensive contact dynamics simulations, we analyze the combined effects of polydispersity both in particle size and in particle shape, defined as the degree of shape irregularity, on the shear strength and microstructure of sheared granular materials composed of pentagonal particles. We find that the shear strength is independent of the size span, but unexpectedly, it declines with increasing shape polydispersity. At the same time, the solid fraction is an increasing function of both the size span and the shape polydispersity. Hence, the densest and loosest packings have the same shear strength. At the scale of the particles and their contacts, we analyze the connectivity of particles, force transmission, and friction mobilization as well as their anisotropies. We show that stronger forces are carried by larger particles and propped by an increasing number of small particles. The independence of shear strength with regard to size span is shown to be a consequence of contact network self-organization, with the falloff of contact anisotropy compensated by increasing force anisotropy. |
| first_indexed | 2024-09-23T13:08:50Z |
| format | Article |
| id | mit-1721.1/96287 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T13:08:50Z |
| publishDate | 2015 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/962872022-09-28T12:13:01Z Effects of shape and size polydispersity on strength properties of granular materials Nguyen, Duc-Hanh Azema, Emilien Sornay, Philippe Radjai, Franck Massachusetts Institute of Technology. Department of Civil and Environmental Engineering Radjai, Franck By means of extensive contact dynamics simulations, we analyze the combined effects of polydispersity both in particle size and in particle shape, defined as the degree of shape irregularity, on the shear strength and microstructure of sheared granular materials composed of pentagonal particles. We find that the shear strength is independent of the size span, but unexpectedly, it declines with increasing shape polydispersity. At the same time, the solid fraction is an increasing function of both the size span and the shape polydispersity. Hence, the densest and loosest packings have the same shear strength. At the scale of the particles and their contacts, we analyze the connectivity of particles, force transmission, and friction mobilization as well as their anisotropies. We show that stronger forces are carried by larger particles and propped by an increasing number of small particles. The independence of shear strength with regard to size span is shown to be a consequence of contact network self-organization, with the falloff of contact anisotropy compensated by increasing force anisotropy. France. Commissariat à l'énergie atomique et aux énergies alternatives France. Agence nationale de la recherche (Investissements d'Avenir. ICoME2 Labex. ANR-11-LABX-0053) France. Agence nationale de la recherche (Investissements d'Avenir. A*MIDEX. ANR-11-IDEX-0001-02) 2015-03-31T17:56:32Z 2015-03-31T17:56:32Z 2015-03 2201-09 2015-03-18T22:00:09Z Article http://purl.org/eprint/type/JournalArticle 1539-3755 1550-2376 http://hdl.handle.net/1721.1/96287 Nguyen, Duc-Hanh et al. “Effects of Shape and Size Polydispersity on Strength Properties of Granular Materials.” Physical Review E 91.3 (2015). en http://dx.doi.org/10.1103/PhysRevE.91.032203 Physical Review E Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. American Physical Society application/pdf American Physical Society American Physical Society |
| spellingShingle | Nguyen, Duc-Hanh Azema, Emilien Sornay, Philippe Radjai, Franck Effects of shape and size polydispersity on strength properties of granular materials |
| title | Effects of shape and size polydispersity on strength properties of granular materials |
| title_full | Effects of shape and size polydispersity on strength properties of granular materials |
| title_fullStr | Effects of shape and size polydispersity on strength properties of granular materials |
| title_full_unstemmed | Effects of shape and size polydispersity on strength properties of granular materials |
| title_short | Effects of shape and size polydispersity on strength properties of granular materials |
| title_sort | effects of shape and size polydispersity on strength properties of granular materials |
| url | http://hdl.handle.net/1721.1/96287 |
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