Elasticity and rheology of auxetic granular metamaterials

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dc.contributor.authorHaver, Daan
dc.contributor.authorAcuna, Daniel
dc.contributor.authorJanbaz, Shahram
dc.contributor.authorLerner, Edan
dc.contributor.authorDuring, Gustavo
dc.contributor.authorCoulais, Corentin
dc.date.accessioned2025-01-20T16:12:27Z
dc.date.available2025-01-20T16:12:27Z
dc.date.issued2024
dc.description.abstractThe flowing, jamming, and avalanche behavior of granular materials is satisfyingly universal and vexingly hard to tune: A granular flow is typically intermittent and will irremediably jam if too confined. Here, we show that granular metamaterials made from particles with a negative Poisson's ratio yield more easily and flow more smoothly than ordinary granular materials. We first create a collection of auxetic grains based on a re-entrant mechanism and show that each grain exhibits a negative Poisson's ratio regardless of the direction of compression. Interestingly, we find that the elastic and yielding properties are governed by the high compressibility of granular metamaterials: At a given confinement, they exhibit lower shear modulus, lower yield stress, and more frequent, smaller avalanches than materials made from ordinary grains. We further demonstrate that granular metamaterials promote flow in more complex confined geometries, such as intruder and hopper geometries, even when the packing contains only a fraction of auxetic grains. Moreover, auxetic granular metamaterials exhibit enhanced impact absorption. Our findings blur the boundary between complex fluids and metamaterials and could help in scenarios that involve process, transport, and reconfiguration of granular materials.
dc.fuente.origenWOS
dc.identifier.doi10.1073/pnas.2317915121
dc.identifier.eissn1091-6490
dc.identifier.issn0027-8424
dc.identifier.urihttps://doi.org/10.1073/pnas.2317915121
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/90334
dc.identifier.wosidWOS:001263667200004
dc.issue.numero14
dc.language.isoen
dc.revistaProceedings of the national academy of sciences of the united states of america
dc.rightsacceso restringido
dc.subjectmechanical metamaterials
dc.subjectgranular materials
dc.subjectauxetics
dc.subjectjamming
dc.subjectrheology
dc.titleElasticity and rheology of auxetic granular metamaterials
dc.typeartículo
dc.volumen121
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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