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Thursday, October 08, 2009
1:00 PM - 2:00 PM
CNLS Conference Room (TA-3, Bldg 1690)

Student Seminar

Jamming in Granular Polymers and Frictional Granular Assemblies

Lena Lopatina
T-1 and Liquid Crystal Institute, Kent State University

Jamming has attracted growing attention as a possible unifying theme for granular materials, glasses and threshold behavior in materials. Recent results for frictionless granular systems suggest that jamming is a second order phase transition with critical properties. A question of paramount importance is whether this behavior is universal to more complex systems. To address this issue we have simulated the compression of granular polymers and frictional granular monomers. The jamming density of the granular polymers decreases with increasing chain length due to the formation of loops or voids, in agreement with recent experiments [1,2]. For frictional granular monomers the jamming density is depressed relative to a frictionless system, and we observe the formation of voids in the packing, which does not occur in the frictionless case. We discuss our results in terms of the fragile jamming phase recently studied in compression experiments [3].

[1] G. Zheng et al, Science, in press (2009). [2] C.J. Olson Reichhardt and L.M. Lopatina, Science, in press (2009). [3] M. Bandi, M. Rivera, F. Kakzia, and R. Ecke, submitted.

Host: Cynthia Reichhardt