Dresden 2014 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 25: Glasses and Glass Transition II (Joint Session with CPP and DY)

DF 25.2: Hauptvortrag

Donnerstag, 3. April 2014, 15:30–16:00, ZEU 114

Getting into shape: Jamming of frictional particles. — •Matthias Schröter, Jean-François Métayer, Frank Rietz, and Max Neudecker — MPI for Dynamics and Self-Organization

In recent years the Jamming paradigm has been promoted as a grand unifying theory of particulate soft matter systems like foams, colloids, emulsions, and granular media [1,2]. However, this approach has mostly evolved from simulations of soft, perfect spheres. Real world particulate systems are often "rough" on either a microscopic or a particle scale. In the first case we talk about friction, in the second about non-spherical shapes.

This talk will use 3D imaging techniques such as X-ray tomography to provide insight into the mechanical stability of tetrahedra packings [3], the volume response of sheared granular media, and the first order phase transition occurring at Random Close Packing. We will show that in non of these three examples the underlying physics is adequately described by the Jamming paradigm.

[1] A. Liu and S. Nagel, Ann. Rev. Cond. Mat. Phys. 1, 347-369 (2010)

[2] M. van Hecke, J. Phys.: Condens. Matter 22, 033101 (2010)

[3] M. Neudecker, S. Ulrich, S. Herminghaus, and M. Schröter, Phys. Rev. Lett. 111, 028001 (2013)