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dc.contributor.authorGravish, Nick
dc.contributor.authorUmbanhowar, Paul B.
dc.contributor.authorGoldman, Daniel I.
dc.date.accessioned2014-10-23T16:52:06Z
dc.date.available2014-10-23T16:52:06Z
dc.date.issued2014
dc.identifier.citationGravish, 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.issn1539-3755 (print)
dc.identifier.issn1550-2376 (Online)
dc.identifier.urihttp://hdl.handle.net/1853/52722
dc.description© 2014 The American Physical Societyen_US
dc.descriptionDOI: 10.1103/PhysRevE.89.042202
dc.description.abstractWe 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.language.isoen_USen_US
dc.publisherGeorgia Institute of Technologyen_US
dc.subjectDrag forceen_US
dc.subjectGranular materialsen_US
dc.subjectGranular mediumen_US
dc.subjectLocalized forcingen_US
dc.subjectLocalized intruderen_US
dc.subjectPlate dragen_US
dc.subjectYield forceen_US
dc.titleForce and flow at the onset of drag in plowed granular mediaen_US
dc.typeArticleen_US
dc.contributor.corporatenameGeorgia Institute of Technology. School of Physicsen_US
dc.contributor.corporatenameGeorgia Institute of Technology. School of Biologyen_US
dc.contributor.corporatenameGeorgia Institute of Technology. Institute for Robotics and Intelligent Machinesen_US
dc.contributor.corporatenameNorthwestern University (Evanston, Ill.). Department of Mechanical Engineeringen_US
dc.publisher.originalAmerican Physical Society
dc.identifier.doi10.1103/PhysRevE.89.042202
dc.embargo.termsnullen_US


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