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Combining tomographic imaging and DEM simulations to investigate the structure of experimental sphere packings
 

Summary: Combining tomographic imaging and DEM simulations to investigate the
structure of experimental sphere packings
Gary W. Delaney,ab
T. Di Matteobc
and Tomaso Aste*bcd
Received 4th January 2010, Accepted 13th May 2010
First published as an Advance Article on the web 3rd June 2010
DOI: 10.1039/b927490a
We introduce and describe in detail a ``virtual laboratory'' platform to study granular materials by
combining advanced image reconstruction techniques from computed X-ray micro tomography and
discrete element method simulations. This platform allows us to directly access quantities such as forces
at the grain contacts, which would be otherwise hard to measure experimentally. We apply this
technique to the investigation of equal sized bead packings prepared experimentally by means of
different methods, and covering a broad range of packing fractions from f 0.57 to f 0.64. Results
concerning the number of contacts, the distribution of forces at contact and the relation of these
quantities with local and global packing properties are presented and discussed. This combined
approach is found to both offer the ability to improve on previous tomographic measurements of
geometric properties of the packings, and to estimate other physical properties that are not available
experimentally.
I. Introduction

  

Source: Aste, Tomaso - Department of Applied Mathematics, Australian National University

 

Collections: Physics