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On the multi‑scale description of electrical conducting suspensions involving perfectly dispersed rods

Article dans une revue avec comité de lecture
Author
PEREZ, Marta
ccABISSET-CHAVANNE, Emmanuelle
10921 Institut de Recherche en Génie Civil et Mécanique [GeM]
BARASINSKI, Anais
ccCHINESTA SORIA, Francisco
ccAMMAR, Amine
143462 Université de Tunis
211916 Laboratoire Angevin de Mécanique, Procédés et InnovAtion [LAMPA]
KEUNINGS, Roland

URI
http://hdl.handle.net/10985/10253
DOI
10.1186/s40323-015-0044-6
Date
2015
Journal
Advanced Modeling and Simulation in Engineering Sciences

Abstract

Nanocomposites allow for a significant enhancement of functional properties, in particular electrical conduction. In order to optimize materials and parts, predictive models are required to evaluate particle distribution and orientation. Both are key parameters in order to evaluate percolation and the resulting electrical networks. Many forming processes involve flowing suspensions for which the final particle orientation could be controlled by means of the flow and the electric field. In view of the multiscale character of the problem, detailed descriptions are defined at the microscopic scale and then coarsened to be applied efficiently in process simulation at the macroscopic scale. The first part of this work revisits the different modeling approaches throughout the different description scales. Then, modeling of particle contacts is addressed as they determine the final functional properties, in particular electrical conduction. Different descriptors of rod contacts are proposed and analyzed. Numerical results are discussed, in particular to evaluate the impact of closure approximations needed to derive a macroscopic description.

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