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.date.updated

2020-07-03T18:29:05Z

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.identifier.issn

2470-0045

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2470-0053

dc.identifier.uri

https://hdl.handle.net/10161/21148

dc.language

en

dc.publisher

American Physical Society (APS)

dc.relation.ispartof

Physical Review E

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10.1103/physreve.101.062903

dc.subject

cond-mat.soft

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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.orcid

Zhao, Yuchen|0000-0002-9779-4577

duke.contributor.orcid

Socolar, Joshua ES|0000-0003-0532-7099

pubs.begin-page

062903

pubs.issue

6

pubs.organisational-group

Trinity College of Arts & Sciences

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Physics

pubs.organisational-group

Duke

pubs.organisational-group

Student

pubs.publication-status

Published online

pubs.volume

101

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