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Yielding, rigidity, and tensile stress in sheared columns of hexapod granules

dc.contributor.author Zhao, Yuchen
dc.contributor.author Barés, Jonathan
dc.contributor.author Socolar, Joshua ES
dc.date.accessioned 2020-07-03T18:29:06Z
dc.date.available 2020-07-03T18:29:06Z
dc.identifier.issn 2470-0045
dc.identifier.issn 2470-0053
dc.identifier.uri https://hdl.handle.net/10161/21148
dc.description.abstract Granular packings of non-convex or elongated particles can form free-standing structures like walls or arches. For some particle shapes, such as staples, the rigidity arises from interlocking of pairs of particles, but the origins of rigidity for non-interlocking particles remains unclear. We report on experiments and numerical simulations of sheared columns of ``hexapods,'' particles consisting of three mutually orthogonal sphero-cylinders whose centers coincide. We vary the length-to-diameter aspect ratio, $\alpha$, of the sphero-cylinders and subject the packings to quasistatic direct shear. For small $\alpha$, we observe a finite yield stress. For large $\alpha$, however, the column becomes rigid when sheared, supporting stresses that increase sharply with increasing strain. Analysis of X-ray micro-computed tomography (Micro-CT) data collected during the shear reveals that the stiffening is associated with a tilted, oblate cluster of hexapods near the nominal shear plane in which particle deformation and average contact number both increase. Simulation results show that the particles are collectively under tension along one direction even though they do not interlock pairwise. These tensions comes from contact forces carrying large torques, and they are perpendicular to the compressive stresses in the packing. They counteract the tendency to dilate, thus stabilize the particle cluster.
dc.language en
dc.publisher American Physical Society (APS)
dc.relation.ispartof Physical Review E
dc.relation.isversionof 10.1103/physreve.101.062903
dc.subject cond-mat.soft
dc.subject cond-mat.soft
dc.subject cond-mat.stat-mech
dc.title Yielding, rigidity, and tensile stress in sheared columns of hexapod granules
dc.type Journal article
duke.contributor.id Zhao, Yuchen|0595611
duke.contributor.id Socolar, Joshua ES|0100040
dc.date.updated 2020-07-03T18:29:05Z
pubs.begin-page 062903
pubs.issue 6
pubs.organisational-group Trinity College of Arts & Sciences
pubs.organisational-group Physics
pubs.organisational-group Duke
pubs.organisational-group Student
pubs.publication-status Published online
pubs.volume 101
duke.contributor.orcid Zhao, Yuchen|0000-0002-9779-4577
duke.contributor.orcid Socolar, Joshua ES|0000-0003-0532-7099


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