Bulletin of the American Physical Society
APS March Meeting 2012
Volume 57, Number 1
Monday–Friday, February 27–March 2 2012; Boston, Massachusetts
Session L33: Invited Session: Frontiers of Granular Physics
2:30 PM–5:30 PM,
Tuesday, February 28, 2012
Sponsoring Units: GSNP DFD
Chair: Eric Weeks, Emory University
Abstract ID: BAPS.2012.MAR.L33.4
Abstract: L33.00004 : Geometrically Cohesive Granular Materials*
4:18 PM–4:54 PM
Preview Abstract Abstract
(Rochester Institute of Technology)
Geometrically cohesive granular materials (GCGM) are collections of particles whose individual shape leads to entanglements that resist extension forces, resulting in a non-zero Young's modulus. Examples include long, thin (anisometric) rods, arcs of varying length, and U-shaped staples. I will report on experimental and computational work that investigates the peculiar rigidity of GCGM. These include canonical stress-strain and vibration-induced melting experiments on U-shaped staples that have revealed a non-monotonic dependence of collective rigidity on particle shape. For concave particles, rigidity appears proportional to an ``entanglement number'' --- the number of neighbors that pass through the area partially bounded by the particle. Computational and analytic work on arcs and staples confirm the non-monotonic behavior of the entanglement number, and simulations that match the experimental conditions are underway to confirm entanglement as the basic mechanism of GCGM's rigidity.
*This work funded in part by the National Science Foundation and Donors from the Petroleum Research Fund.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2012.MAR.L33.4
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