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Friction in inertial granular flows: competition between dilation and grain-scale dissipation rates

Hurley, Ryan C. and Andrade, José E. (2015) Friction in inertial granular flows: competition between dilation and grain-scale dissipation rates. Granular Matter, 17 (3). pp. 287-295. ISSN 1434-7636. https://resolver.caltech.edu/CaltechAUTHORS:20150603-094642638

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Abstract

Friction plays an important role in the behavior of flowing granular media. The effective friction coefficient is a description of shear strength in both slow and rapid flows of these materials. In this paper, we study the steady state effective friction coefficient μ in a granular material in two steps. First, we develop a new relationship between the steady state effective friction coefficient, the shear rate, the solid fraction, and grain-scale dissipation processes in a simple shear flow. This relationship elucidates the rate- and porosity-dependent nature of effective friction in granular flows. Second, we use numerical simulations to study how the various quantities in the relationship change with shear rate and material properties. We explore how the relationship illuminates the grain-scale dissipation processes responsible for macroscopic friction. We examine how the competing processes of shearing dilation and grain-scale dissipation rates give rise to rate-dependence. We also compare our findings with previous investigations of effective friction in simple shear.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1007/s10035-015-0564-2DOIArticle
http://link.springer.com/article/10.1007%2Fs10035-015-0564-2PublisherArticle
http://rdcu.be/ttcRPublisherFree ReadCube access
Additional Information:© 2015 Springer-Verlag Berlin Heidelberg. Received: 16 December 2014; Published online: 19 May 2015. Support by the Air Force Office of Scientific Research Grant # FA9550-12-1-0091 through the University Center of Excellence in High-Rate Deformation Physics of Heterogenous Materials is gratefully acknowledged.
Funders:
Funding AgencyGrant Number
Air Force Office of Scientific Research (AFOSR)FA9550-12-1-0091
Issue or Number:3
Record Number:CaltechAUTHORS:20150603-094642638
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150603-094642638
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:57970
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:03 Jun 2015 17:12
Last Modified:03 Oct 2019 08:30

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