Session J53: Disordered Systems: Jamming
11:15 AM–2:15 PM, Tuesday, February 28, 2012
Room: 153B
Sponsoring Unit:
GSNP
Chair: Patrick Charbonneau, Duke University
Abstract ID: BAPS.2012.MAR.J53.12
Abstract: J53.00012 : To be or not to be jammed
1:27 PM–1:39 PM
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Abstract 
Authors:
Simon Dagois-Bohy
(Kamerling Ohnes Laboratory - Leiden University)
Brian Tighe
(TU Delft - 3mE)
Johannes Simon
(Kamerling Ohnes Laboratory - Leiden University)
Silke Henkes
(Syracuse University)
Martin Van Hecke
(Kamerling Ohnes Laboratory - Leiden University)
When are packings of soft athermal spheres jammed? Any experimentally relevant definition must at least require a jammed packing to resist compression and shear. Numerical algorithms usually rely on a global compression monitored by a parameter (like pressure) that signals whether the packing is jammed or not. Here we show that compression is not sufficient to ensure properly jammed packings : some of those packings have positive pressures and bulk moduli, but negative shear moduli, and even for large systems, the number of these ``bad apples'' diverges as the jamming point is approached. We will discuss how to understand this situation and propose as a remedy the boundary relaxation, that is including the boundary shape parameters as variables in the equilibration process; finally we will compare the distribution of shear moduli obtained for both methods.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2012.MAR.J53.12