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Fundamentals of cohesive powder consolidation and flow

Abstract.

The fundamentals of cohesive powder consolidation and flow behaviour are explained to combine reasonably particle and continuum mechanics. The influence of elastic-plastic repulsion and, consequently, stressing pre-history dependent adhesion is demonstrated by the new model “stiff particles with soft contacts” and the contact force equilibrium. With this as the physical basis, incipient powder consolidation, yield and cohesive steady-state flow are explained. These models are used to evaluate shear cell test results as constitutive functions for computer aided apparatus design for reliable flow.

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Correspondence to Jürgen Tomas.

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The author would like to acknowledge his previous co-workers Dr. T. Gröger, Dr. Th. Kollmann, Dr. B. Reichmann and his present co-workers Dr. W. Hintz, Dr. S. Aman, and Dr. W. Schubert for providing relevant information and theoretical tips. The advises from H.-J. Butt [22] and S. Luding [23] with respect to the fundamentals of particle and powder mechanics were especially appreciated during the colaboration of the project “shear dynamics of cohesive, fine-disperse particle systems” of the joint research program “Behaviour of Granular Media” of German Research Association (DFG).

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Tomas, J. Fundamentals of cohesive powder consolidation and flow. GM 6, 75–86 (2004). https://doi.org/10.1007/s10035-004-0167-9

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  • DOI: https://doi.org/10.1007/s10035-004-0167-9

Keywords

  • Particle contact mechanics
  • Adhesion
  • Van der Waals force
  • Constitutive models
  • Powder flow properties