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Generation of porous particle structures using the void expansion method

Schenker, Iwan ; Filser, Frank ; Herrmann, Hans ; Gauckler, Ludwig

In: Granular Matter, 2009, vol. 11, no. 3, p. 201-208

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    Titre
    • Generation of porous particle structures using the void expansion method
    Auteur
    • Schenker, Iwan. Department of Materials, Institute of Nonmetallic Materials, ETH Zurich, 8093, Zurich, Switzerland
    • Filser, Frank. Department of Materials, Institute of Nonmetallic Materials, ETH Zurich, 8093, Zurich, Switzerland
    • Herrmann, Hans. Computational Physics for Engineering Materials, Institute for Building Materials, ETH Zurich, 8093, Zurich, Switzerland
    • Gauckler, Ludwig. Department of Materials, Institute of Nonmetallic Materials, ETH Zurich, 8093, Zurich, Switzerland
    Type de document
    • Postprint
    Identifiant OAI-PMH
    • oai:doc.rero.ch:315190
    Summary
    The newly developed "void expansion method” allows for an efficient generation of porous packings of spherical particles over a wide range of volume fractions using the discrete element method. Particles are randomly placed under addition of much smaller "void-particles”. Then, the void-particle radius is increased repeatedly, thereby rearranging the structural particles until formation of a dense particle packing. The structural particles' mean coordination number was used to characterize the evolving microstructures. At some void radius, a transition from an initially low to a higher mean coordination number is found, which was used to characterize the influence of the various simulation parameters. For structural and void-particle stiffnesses of the same order of magnitude, the transition is found at constant total volume fraction slightly below the random close packing limit. For decreasing void-particle stiffness the transition is shifted towards a smaller void-particle radius and becomes smoother