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A new interparticle friction apparatus for granular materials

Cavarretta, I, Rocchi, I and Coop, MR (2011) A new interparticle friction apparatus for granular materials Canadian Geotechnical Journal, 48 (12). pp. 1829-1840.

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Abstract

A new apparatus is described that measures interparticle friction between sand-sized grains over relatively large displacements and also under immersion in a fluid. Its relatively simple design allows the key calibrations to be checked by statics. An analysis of the geometry of simple spherical particle contacts and the forces at those contacts revealed that there are strict constraints on the permissible stiffness of the interparticle friction apparatus to avoid stick-slip behaviour. Tests on ball bearings gave highly repeatable data, while others on glass ballotini revealed a significant effect of ambient humidity on the data obtained. The interparticle friction was found to increase with the roughness of the ballotini. Immersion in water increased the interparticle friction slightly for both the ballotini and quartz sand particles, while immersion in oil reduced the friction considerably for the quartz sand, especially at higher contact force levels.

Item Type: Article
Authors :
NameEmailORCID
Cavarretta, IUNSPECIFIEDUNSPECIFIED
Rocchi, IUNSPECIFIEDUNSPECIFIED
Coop, MRUNSPECIFIEDUNSPECIFIED
Date : December 2011
Identification Number : 10.1139/T11-077
Depositing User : Symplectic Elements
Date Deposited : 28 Mar 2017 14:08
Last Modified : 31 Oct 2017 15:12
URI: http://epubs.surrey.ac.uk/id/eprint/712726

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