Regensburg 2013 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 33: Poster II
DY 33.25: Poster
Thursday, March 14, 2013, 17:00–19:00, Poster C
Measuring granular force chains in 3D — •Junaid M. Laskar1, Stephan Herminghaus1, Matthias Schröter1, and Karen E. Daniels2 — 1Dynamics of Complex Fluids, Max Planck Institute for Dynamics and Self Organization, Goettingen, Germany — 2Department of Physics, North Carolina State University, Raleigh, USA
One of the outstanding issues within the area of statistical physics of granular matter is to have better understanding of the statistical properties of forces and force chains. Due to the link to jamming, strain induced yielding and mechanical response; this issue has also technological relevance in civil engineering and geophysics [1, 2]. There have been pioneering efforts towards experimentally measuring the force chains and their spatial distributions, though these are limited to two dimensions (2D) [1, 2]. For 3D granular systems, till now there are no experimental determinations of the forces on interior grains.
In this regard, an experimental method, based on two photon fluorescence spectroscopy to measure forces in the interior of ensemble of Ruby spheres, is developed. This novel method, which is the extension of the one demonstrated for a single ruby sphere to 3D, will be discussed in detail [3]. The results obtained from the shift in fluorescence peak in response to external compression will be discussed.
References:
[1] T. S. Majumdar and R. P. Behringer, Nature 453, 1079 (2005) [2] Karen E. Daniels and Nicholas W. Hayman, J. of Geophys. Res. 113, B11411 (2008) [3] Y. Chen et al., J. Appl. Phys. 101, 084908 (2007)