Flow properties of cohesive nanopowders--颗粒学报PARTICUOLOGY

Mechanical Process Engineering, Process Engineering Department, The Otto-von-Guericke-University Magdeburg, Universitätsplatz 2, D–39 106 Magdeburg, Germany

10.1016/S1672-2515(07)60001-3

Volume 1, Issue 6, December 2003, Pages 231-241

Received 26 August 2003, Accepted 15 October 2003, Available online 27 November 2007.

E-mail: juergen.tomas@vas.uni-magdeburg.de

Highlights

Abstract

The fundamentals of cohesive powder consolidation and flow behaviour using a reasonable combination of particle and continuum mechanics are explained. By means of the model “stiff particles with soft contacts”, the influence of elastic-plastic repulsion in particle contacts is demonstrated. With this as the physical basis, the stationary yield locus, instantaneous yield loci and consolidation loci, flow function and compression function are presented. The flow properties of a very cohesive titania nanopowder (d_S=200 nm) are shown. These models are used to evaluate shear cell test results as constitutive functions for computer aided apparatus design for reliable powder flow.

Graphical abstract

Keywords

particle mechanics; adhesion force; van der Waals forces; constitutive models; cohesive powder; flow properties

文章导读