Force and flow at the onset of drag in plowed granular media

dc.contributor.author Gravish, Nick
dc.contributor.author Umbanhowar, Paul B.
dc.contributor.author Goldman, Daniel I.
dc.contributor.corporatename Georgia Institute of Technology. School of Physics en_US
dc.contributor.corporatename Georgia Institute of Technology. School of Biology en_US
dc.contributor.corporatename Georgia Institute of Technology. Institute for Robotics and Intelligent Machines en_US
dc.contributor.corporatename Northwestern University (Evanston, Ill.). Department of Mechanical Engineering en_US
dc.date.accessioned 2014-10-23T16:52:06Z
dc.date.available 2014-10-23T16:52:06Z
dc.date.issued 2014
dc.description © 2014 The American Physical Society en_US
dc.description DOI: 10.1103/PhysRevE.89.042202
dc.description.abstract We study the transient drag force F[subscript D] on a localized intruder in a granular medium composed of spherical glass particles. A flat plate is translated horizontally from rest through the granular medium to observe how F[subscript D] varies as a function of the medium’s initial volume fraction, φ. The force response of the granular material differs above and below the granular critical state, φ[subscript c], the volume fraction which corresponds to the onset of grain dilatancy. For φ<φ[subscript c] F[subscript D] increases monotonically with displacement and is independent of drag velocity for the range of velocities examined (<10 cm/s). For φ>φ[subscript c], F[subscript D] rapidly rises to a maximum and then decreases over further displacement. The maximum force for φ>φ[subscript c] increases with increasing drag velocity. In quasi-two-dimensional drag experiments, we use granular particle image velocimetry (PIV) to measure time resolved strain fields associated with the horizontal motion of a plate started from rest. PIV experiments show that the maxima in F[subscript D] for φ>φ[subscript c] are associated with maxima in the spatially averaged shear strain field. For φ>φ[subscript c] the shear strain occurs in a narrow region in front of the plate, a shear band. For φ<φ[subscript c] the shear strain is not localized, the shear band fluctuates in space and time, and the average shear increases monotonically with displacement. Laser speckle measurements made at the granular surface ahead of the plate reveal that for φ<φ[subscript c] particles are in motion far from the intruder and shearing region. For φ>φ[subscript c], surface particles move only during the formation of the shear band, coincident with the maxima in F[subscript D], after which the particles remain immobile until the sheared region reaches the measurement region. en_US
dc.embargo.terms null en_US
dc.identifier.citation Gravish, N., Umbanhowar, P., & Goldman, D. Force and flow at the onset of drag in plowed granular media. Physical Review E, 89(4), 042202 (2014).© 2014 by The American Physical Society. en_US
dc.identifier.doi 10.1103/PhysRevE.89.042202
dc.identifier.issn 1539-3755 (print)
dc.identifier.issn 1550-2376 (Online)
dc.identifier.uri http://hdl.handle.net/1853/52722
dc.language.iso en_US en_US
dc.publisher Georgia Institute of Technology en_US
dc.publisher.original American Physical Society
dc.subject Drag force en_US
dc.subject Granular materials en_US
dc.subject Granular medium en_US
dc.subject Localized forcing en_US
dc.subject Localized intruder en_US
dc.subject Plate drag en_US
dc.subject Yield force en_US
dc.title Force and flow at the onset of drag in plowed granular media en_US
dc.type Text
dc.type.genre Article
dspace.entity.type Publication
local.contributor.author Goldman, Daniel I.
local.contributor.corporatename College of Sciences
local.contributor.corporatename School of Physics
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relation.isOrgUnitOfPublication 2ba39017-11f1-40f4-9bc5-66f17b8f1539
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