Adhesion, inelastic contact behavior and simulation of shear dynamics of ultrafine cohesive powder

R. Tykhoniuk*, Jürgen Tomas, S. Luding, M. Kappl, L. Heim, H. J. Butt

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

4 Citations (Scopus)

Abstract

Studies on the adhesion mechanics of particles give better physical understanding of essential constitutive functions of a cohesive powder "continuum". The Discrete Element Method (DEM) allows us to consider in detail the contact and adhesion forces within force and momentum balance for each particle in a sheared particle packing. The introduction of irreversible inelastic contact flattening by the model, "stiff particles with soft contacts", is essential to describe the increase of adhesion force, i.e. of the van der Waals forces during preconsolidation. The history dependent dynamic behavior of cohesive powder flow can be "microscopically" investigated and understood. Using a model for elastic-plastic contact behavior between ultrafine particles (about 1 μm), steady-state flow, incipient yielding, dilatancy and consolidation of TiO 2 powder will be presented. Dynamic formation of a shear zone is also shown and compared to experiments in a standard Jenike shear cell.

Original languageEnglish
Title of host publicationPowders and Grains 2005
Subtitle of host publicationProceedings of the International Conference on Powders & Grains 2005
EditorsR. Garcia-Rojo, H.J. Herrmann, Sean McNamara
Pages499-503
Number of pages5
DOIs
Publication statusPublished - 1 Dec 2005
Externally publishedYes
Event5th International Conference on Micromechanics of Granular Media, Powders and Grains 2005 - Stuttgart, Germany
Duration: 18 Jul 200522 Jul 2005

Conference

Conference5th International Conference on Micromechanics of Granular Media, Powders and Grains 2005
Abbreviated titlePG 2005
CountryGermany
CityStuttgart
Period18/07/0522/07/05

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