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Angle of repose and stress distribution of sandpiles formed with ellipsoidal particles

机译：椭圆形颗粒形成的沙堆的休止角和应力分布

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摘要

The properties of a sandpile such as angle of repose and stress distribution are affected by many variables, among which particle shape is one of the most important. In this work, ellipsoids which can represent a large range of shapes varying from disk- to cylinder-type are used. The discrete element method is employed in order to conduct controlled numerical experiments. The results confirm the general findings reported in the literature. It also shows that with aspect ratios deviating from 1.0, the angle of repose increases significantly, but disk-type shape and cylinder-type shape follow different variation trends. Empirical correlations between the angle of repose and aspect ratio or sphericity are proposed. The analysis on the stress distribution shows that particle shape affects the magnitude of the normal contact force between particles significantly, with spheres being the smallest. The pressure distribution underneath sandpiles is featured with a relatively constant normal pressure in the central region rather than a dip. It is confirmed that non-spherical particles have more pronounced stress dip than spherical particles.
机译：沙堆的性质（如休止角和应力分布）受许多变量影响，其中颗粒形状是最重要的变量之一。在这项工作中，使用了可以代表从圆盘到圆柱的各种形状的各种形状的椭圆体。为了进行受控的数值实验，采用了离散元法。结果证实了文献报道的一般发现。它还表明，当纵横比偏离1.0时，休止角显着增加，但圆盘形和圆柱形遵循不同的变化趋势。提出了休止角与纵横比或球形度之间的经验相关性。对应力分布的分析表明，颗粒形状会显着影响颗粒间法向接触力的大小，其中球体最小。沙堆下方的压力分布的特征是在中心区域具有相对恒定的法向压力，而不是下沉。可以确定的是，非球形颗粒比球形颗粒具有更明显的应力降。

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  • 来源
    《Granular matter》 |2014年第5期|695-709|共15页
  • 作者

    Z. Y. Zhou; R. P. Zou; D. Pinson; A. B. Yu;

  • 作者单位

    Laboratory for Simulation and Modelling of Particulate Systems, School of Materials Science and Engineering, The University of New South Wales, Sydney, NSW 2052, Australia;

    Laboratory for Simulation and Modelling of Particulate Systems, School of Materials Science and Engineering, The University of New South Wales, Sydney, NSW 2052, Australia;

    Steelmaking Technology and Planning, BlueScope Steel, P.O. Box 202, Port Kembla, NSW 2505, Australia;

    Laboratory for Simulation and Modelling of Particulate Systems, School of Materials Science and Engineering, The University of New South Wales, Sydney, NSW 2052, Australia, Department of Chemical Engineering, Monash University, Clayton, VIC 3800, Australia;

  • 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

    Sandpile; Ellipsoids; Angle of repose; Stress dip; Discrete element method;

    机译：沙堆;椭球;休止角;应力骤降离散元法;

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