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Analysis of internal state and strains in granular material at meso-scale: influence of particle shape

机译：细观颗粒材料内部状态和应变的分析：颗粒形状的影响

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摘要

Using Non Smooth Contact Dynamic formalism to conduct contact dynamics simulations, we investigate the internal state and deformation of two granular numerical materials composed of poly-sized circular and polygonal rigid particles. The 2D granular specimens are subjected to classical biaxial loading. The main goal of this study is to generalize the results previously obtained for assemblies of disks (Nguyen et al. in Int J Solids Struct 46:3257-3271, 2009). Since the spherical geometry of this type of grain leads to overestimating the role of rotations and facilitates deformation, we want to evaluate incremental response by using circular and angular particles Furthermore, as rigid contacts are modeled, the simulations considered allow accurate information on irreversible strains to be obtained. These samples are analyzed at a meso scale composed of closed loops of particles in contact. The texture at the meso level is characterized by parameters such as local density and the shape and orientation of the meso domains. Six types of meso domain, called six phases, are defined to perform a thorough analysis at this level. It is shown that throughout compression tests the phases composed of meso domains oriented in the compression direction increase, leading to greater anisotropy in the direction of compression. All these evolutions were more marked for the material containing polygonal particles. Based on an analysis proposed in a previous paper (Cambou et al. in Euro J Mech A Solids 19:999-1014,2000), the incremental strain at meso scale is defined, whatever the particle shapes. The local strain tensor in the six phases is analyzed throughout the loading. The phases of meso domains oriented in the compression direction present more rigid behavior and greater dilatancy.
机译：使用非光滑接触动力学形式主义进行接触动力学模拟，我们研究了由多尺寸圆形和多边形刚性颗粒组成的两种粒状数值材料的内部状态和变形。 2D颗粒试样受到经典的双轴载荷。这项研究的主要目标是概括先前组装磁盘时获得的结果（Nguyen等人，Int J Solids Struct 46：3257-3271，2009）。由于这种类型的晶粒的球形几何形状导致高估了旋转的作用并促进了变形，因此我们想通过使用圆形和角形粒子来评估增量响应。此外，由于对刚性接触进行了建模，因此所考虑的模拟可以提供有关不可逆应变的准确信息，获得。这些样品以介观尺度进行分析，介观尺度由接触的颗粒的闭环组成。细观水平上的纹理的特征在于诸如局部密度和细观域的形状和取向的参数。定义了六种类型的介观域，称为六个阶段，以便在此级别上进行全面的分析。结果表明，在整个压缩测试中，由在压缩方向上定向的介观域组成的相会增加，从而导致压缩方向上的各向异性更大。对于包含多边形颗粒的材料，所有这些演变都更加明显。基于先前论文中提出的分析（Cambou等人，Euro J Mech A Solids 19：999-1014，2000），定义了介观尺度上的增量应变，无论颗粒形状如何。在整个加载过程中，分析了六个阶段中的局部应变张量。沿压缩方向取向的中观畴的相表现出更刚性的行为和更大的膨胀性。

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  • 来源
    《Granular matter》 |2014年第5期|657-673|共17页
  • 作者

    Marie Chaze; Bernard Cambou;

  • 作者单位

    LTDS - UMR CNRS 5513, Universite de Lyon, Ecole Centrale de Lyon, 36 av. Guy de Collongue, 69134 Ecully Cedex, France;

    LTDS - UMR CNRS 5513, Universite de Lyon, Ecole Centrale de Lyon, 36 av. Guy de Collongue, 69134 Ecully Cedex, France;

  • 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

    Granular materials; Meso-scale; Strain; LMGC90; Polygonal grains; Contact dynamics method;

    机译：粒状材料;中尺度应变;LMGC90;多边形颗粒;接触动力学方法;

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