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Investigation of powder flowability at low stresses: Influence of particle size and size distribution

Stavrou, Alexandros Georgios, Hare, Colin, Hassanpour, Ali and Wu, Charley (2020) Investigation of powder flowability at low stresses: Influence of particle size and size distribution Powder Technology, 364. pp. 98-114.

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At moderate stresses, shear cells are the preferred method of powder flow measurement. However, several industrial processes operate at low stresses, where the determination of unconfined yield strength by the shear cell technique may be inconsistent, or found not to correlate with observed behaviour. Alternatively, ball indentation can be used, which directly measures hardness; related to unconfined yield strength by the constraint factor. However, it is not known how constraint factor is influenced by particle properties. Here, ball indentation and shear cell methods are applied for glass beads of various size distributions, and the influence of particle size distribution on the constraint factor is explored. The constraint factor is shown to be independent of the pre-consolidation stress, though reduces as the d10, d50 or d90 are increased. Unconfined yield strength inferred from indentation measurements suggest that extrapolation of shear cell data to low stresses overestimates the unconfined yield strength

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Chemical and Process Engineering
Authors :
Stavrou, Alexandros Georgios
Hassanpour, Ali
Date : 23 January 2020
Funders : International Fine Particle Research Institute (IFPRI)
DOI : 10.1016/j.powtec.2020.01.068
Copyright Disclaimer : © 2020 Elsevier B.V. All rights reserved.
Uncontrolled Keywords : Powder flowability Low consolidation stresses Ball indentation Shear cell Particle size Particle size distribution
Depositing User : James Marshall
Date Deposited : 06 Apr 2020 12:36
Last Modified : 06 Apr 2020 12:36

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