Levich Institute Seminar Announcement, 02/19/2013
Tuesday, 02/19/2013
2:00 PM
Steinman Hall, Room #312
(Chemical Engineering Conference Room)

Professor Scott Franklin
Rochester Institute of Technology
Department of Physics and Director of Science and Mathematics Education Research Collaborative (SMERC)

"Geometrically Cohesive Granular Materials "


I will report on experimental and computational work that investigates the peculiar rigidity of geometrically cohesive granular materials --- materials that cohere due to particle geometry . 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 is proportional to an ``entanglement density'' --- the density 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. Rheological experiments show that piles appear to obey a weakest-link theory that posits that longer piles are less able to resist tensile forces.


I received my Ph.D. in Physics in 1997 from the University of Texas at Austin (advisor: Michael Marder). I then held an NSF Postdoctoral Fellowship in Science, Math, Engineering, and Technology Education before joining RIT in 2000.


Granular materials, particularly those with radically non-spherical shape.

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