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Article: A discrete element analysis of elastic properties of granular materials

TitleA discrete element analysis of elastic properties of granular materials
Authors
Issue Date2013
Citation
Granular Matter, 2013, v. 15, p. 139-147 How to Cite?
AbstractThe elastic properties of a regular packing of spheres with different tolerances were evaluated using the discrete element method to elucidate the mechanisms behind the discrepancies between laboratory experiments and theoretical predictions of the classic Hertz-Mindlin contact law. The simulations indicate that the elastic modulus of the packing is highly dependent on the coordination number and the magnitude and distribution of contact normal forces, and this dependence is macroscopically reflected as the influence of confining pressure and void ratio. The increase of coordination number and the uniformity of contact normal forces distribution with increasing confining pressure results in the stress exponent n for elastic modulus being higher than 1/3 as predicted by the Hertz-Mindlin law. Furthermore, the simulations show that Poisson's ratio of a granular packing is not a constant as commonly assumed, but rather it decreases as confining pressure increases. The variation of Poisson's ratio appears to be a consequence of the increase of the coordination number rather than the increase of contact normal forces with confining pressure. © 2013 Springer-Verlag Berlin Heidelberg.
Persistent Identifierhttp://hdl.handle.net/10722/188912
ISSN
2015 Impact Factor: 1.74
2015 SCImago Journal Rankings: 1.033
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorGu, Xen_US
dc.contributor.authorYang, Jen_US
dc.date.accessioned2013-09-17T14:20:51Z-
dc.date.available2013-09-17T14:20:51Z-
dc.date.issued2013en_US
dc.identifier.citationGranular Matter, 2013, v. 15, p. 139-147en_US
dc.identifier.issn14345021-
dc.identifier.urihttp://hdl.handle.net/10722/188912-
dc.description.abstractThe elastic properties of a regular packing of spheres with different tolerances were evaluated using the discrete element method to elucidate the mechanisms behind the discrepancies between laboratory experiments and theoretical predictions of the classic Hertz-Mindlin contact law. The simulations indicate that the elastic modulus of the packing is highly dependent on the coordination number and the magnitude and distribution of contact normal forces, and this dependence is macroscopically reflected as the influence of confining pressure and void ratio. The increase of coordination number and the uniformity of contact normal forces distribution with increasing confining pressure results in the stress exponent n for elastic modulus being higher than 1/3 as predicted by the Hertz-Mindlin law. Furthermore, the simulations show that Poisson's ratio of a granular packing is not a constant as commonly assumed, but rather it decreases as confining pressure increases. The variation of Poisson's ratio appears to be a consequence of the increase of the coordination number rather than the increase of contact normal forces with confining pressure. © 2013 Springer-Verlag Berlin Heidelberg.-
dc.languageengen_US
dc.relation.ispartofGranular Matteren_US
dc.titleA discrete element analysis of elastic properties of granular materialsen_US
dc.typeArticleen_US
dc.identifier.emailGu, X: gxq1981@hku.hken_US
dc.identifier.emailYang, J: junyang@hkucc.hku.hken_US
dc.identifier.authorityYang, J=rp00201en_US
dc.identifier.doi10.1007/s10035-013-0390-3-
dc.identifier.scopuseid_2-s2.0-84880755698-
dc.identifier.hkuros221229en_US
dc.identifier.volume15en_US
dc.identifier.spage139en_US
dc.identifier.epage147en_US
dc.identifier.isiWOS:000317008400002-

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