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Stress transmission in systems of faceted particles in a silo: the roles of filling rate and particle aspect ratio

机译：筒仓中刻面颗粒系统中的应力传递：填充率和颗粒长宽比的作用

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摘要

We present experimental and numerical results for particle alignment and stress distribution in packings of faceted particles deposited in a small-scale bi-dimensional silo. First, we experimentally characterize the deposits' morphology in terms of the particles' aspect ratio and feeding rate. Then we use the experimental results to validate our discrete element method (REM) based on spheropolygons. After achieving excellent agreement, we use contact forces and fabric provided by the simulations to calculate the coarsegrained stress tensor. For low feeding rates, square particles display a strong tendency to align downwards, i.e., with a diagonal parallel to gravity. This morphology leads to stress transmission towards the walls, implying a quick development of pressure saturation, in agreement with the Janssen effect. When the feed rate is increased, both the disorder and the number of horizontal squares in the silo increase, hindering the Janssen effect. Conversely, for elongated particles the feed rate has a weak effect on the final deposit properties. Indeed, we always observe highly ordered structures of horizontal rods where the stress is transmitted mainly in the vertical direction.
机译：我们提供了在小型二维筒仓中沉积的多面颗粒填料中的颗粒排列和应力分布的实验和数值结果。首先，我们根据颗粒的长径比和进料速度对沉积物的形态进行实验表征。然后，我们使用实验结果验证了基于球形多边形的离散元方法（REM）。在达成极好的一致性之后，我们使用模拟提供的接触力和织物来计算粗粒度应力张量。对于低进料速率，正方形颗粒表现出强烈的向下排列趋势，即与重力平行的对角线。这种形态导致应力传递到壁上，这意味着与Janssen效应一致的压力饱和度的快速发展。当进给速度增加时，筒仓中的无序度和水平方格数均增加，从而阻碍了詹森效应。相反，对于细长的颗粒，进料速率对最终沉积物的性能影响很小。实际上，我们总是观察到水平杆的高度有序结构，其中应力主要在垂直方向上传递。

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  • 来源
    《Granular matter》 |2014年第4期|411-420|共10页
  • 作者

    M. Acevedo; I. Zuriguel; D. Maza; I. Pagonabarraga; F. Alonso-Marroquin; R. C. Hidalgo;

  • 作者单位

    Departamento de Fisica, Facultad de Ciencias, Universidad de Navarra,31080 Pamplona, Spain;

    Departamento de Fisica, Facultad de Ciencias, Universidad de Navarra,31080 Pamplona, Spain;

    Departamento de Fisica, Facultad de Ciencias, Universidad de Navarra,31080 Pamplona, Spain;

    Departament de Fisica Fonamental, Carrer Marti i Franques 1,Universitat de Barcelona, 08028 Barcelona, Spain;

    School of Civil Engineering, The University of Sydney,Sydney, NSW 2006, Australia;

    Departamento de Fisica, Facultad de Ciencias, Universidad de Navarra,31080 Pamplona, Spain;

  • 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

    Stress; Silo; Faceted particles; Polyhedral particles; Janssen; Filling method;

    机译：强调;筒仓多面颗粒;多面体颗粒;詹森;填充方式;

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