Session Y5: Fluctuating Random Solids and their universal properties
11:15 AM–1:39 PM, Friday, March 9, 2007
Colorado Convention Center Room: Korbel 1A-1B
Sponsoring Units:
GSNP DCMP
Chair: Horacio Castillo, Ohio University
Abstract ID: BAPS.2007.MAR.Y5.4
Abstract: Y5.00004 : Molecular dynamics studies of rigidity in solids
1:03 PM–1:39 PM
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Abstract
Author:
Michael Plischke
(Simon Fraser University)
We have used molecular dynamics (MD) to study the elastic properties of systems of particles randomly and permanently crosslinked to each other as function of crosslink density $p$. At zero temperature, such systems generically lose the ability to withstand shear at a rigidity percolation point, $p_r$, that is (at least for particles interacting through central forces) different from the geometric percolation point $p_c$. At finite temperatures there is an entropy-generated component of the shear modulus $G(p,T)$ that remains finite for all $p > p_c$ and which vanishes with a characteristic power law $G(p,T)\sim (p-p_c)^t$. Our simulations in both two and three dimensions seem to indicate that $t$ is model-independent and, within our error bars, the same as the exponent that describes the behavior of a disordered network of conductors near its percolation point.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2007.MAR.Y5.4