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SUMMARY:The stress ensemble for granular packings - Silke Henkes\, Univers
 ity of Aberdeen
DTSTART:20150522T120000Z
DTEND:20150522T130000Z
UID:TALK59598@talks.cam.ac.uk
CONTACT:Lucy Colwell
DESCRIPTION:Granular packings are disordered\, athermal\, driven materials
  that defy description with conventional statistical mechanics. In this ta
 lk\, I will introduce the stress ensemble\, based on conservation laws for
  packings in mechanical equilibrium. Adapting the fundamental derivation o
 f the thermal canonical ensemble\, we arrive at a description with a granu
 lar density of states\, closely linked to the entropy\, and a tensorial in
 verse temperature equivalent. The idea of the ensemble has been tested num
 erically in frictionless packings\, and experimentally in frictional packi
 ngs\, including an adaptation of the SGR formalism. I will briefly sketch 
 these.\n\nThe complex interactions between stress and contact degrees of f
 reedom allow only limited direct calculations. I will present the results 
 of a field theory based on the Airy stress function (2 dimensional)\, and 
 a full mean field description.
LOCATION:Todd Hamied Room\, Dept. of Chemistry
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