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Generation of porous particle structures using the void expansion method

机译：使用空隙膨胀法生成多孔颗粒结构

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摘要

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.
机译：新开发的“空隙膨胀方法”允许使用离散元素方法在较大的体积分数范围内有效生成球形颗粒的多孔填料。将颗粒随机放置在添加了更小的“空颗粒”的情况下。然后，空隙粒子的半径反复增加，从而重新排列结构粒子，直到形成致密的粒子堆积。结构粒子的平均配位数用于表征不断发展的微观结构。在某个空隙半径处，找到了从最初的低到较高的平均配位数的过渡，该过渡用于表征各种模拟参数的影响。对于相同数量级的结构刚度和空隙颗粒刚度，在恒定总体积分数略低于随机密堆积极限的情况下发现过渡。为了减小空隙颗粒的刚度，过渡过渡到较小的空隙颗粒半径并变得更平滑。

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  • 来源
    《Granular matter》 |2009年第3期|201-208|共8页
  • 作者

    Iwan Schenker; Frank T. Filser; Hans J. Herrmann; Ludwig J. Gauckler;

  • 作者单位

    Department of Materials, Institute of Nonmetallic Materials, ETH Zurich, 8093 Zurich, Switzerland;

    Department of Materials, Institute of Nonmetallic Materials, ETH Zurich, 8093 Zurich, Switzerland;

    Computational Physics for Engineering Materials, Institute for Building Materials, ETH Zurich, 8093 Zurich, Switzerland;

    Department of Materials, Institute of Nonmetallic Materials, ETH Zurich, 8093 Zurich, Switzerland;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    colloid; coordination number; discrete element method; microstructure generation; porosity;

    机译：胶体;协调号;离散元法微观结构的产生孔隙率;

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