用空隙膨胀法生成多孔颗粒结构
Generation of Porous Particle Structures using the Void Expansion Method
摘要：
新开发的“空隙膨胀法”允许使用离散元法在宽范围的体积分数内有效地生成球形颗粒的多孔填料。颗粒随机放置在添加更小的“空隙颗粒”。然后，重复增加空隙-颗粒半径，从而重新排列结构颗粒，直到形成致密的颗粒堆积。结构粒子的平均配位数被用来表征演变的微结构。在一定的空隙半径，从一个最初的低到一个较高的平均配位数的过渡被发现，这是用来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，发现在恒定的总体积分数略低于随机紧密堆积极限的过渡。为了降低空隙-颗粒刚度，过渡向更小的空隙-颗粒半径移动并且变得更平滑。
英文摘要：
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.
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