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DEM and experimental study of bi-directional simple shear

机译：双向简单剪切的DEM和实验研究

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摘要

Stress-strain responses of granular material under bi-directional simple shear are comprehensively studied experimentally and numerically. The variable direction dynamic cyclic simple shear apparatus is used to test glass beads under various loading paths, and the DEM is used to reproduce experimental results. These two methods are complementary to each other. The glass beads are subject to the first shearing until a specified shear strain is reached, followed by the second shearing until the failure of samples, and the two shears are at various angles. The experimental results are in good agreement with the numerical results. Both experimental and numerical studies indicate that the development of shear stresses is dependent on the angle between the two shears in the early stage, and they approach the same ultimate values at the failure. The lateral stress, principal stress and non-coaxiality are also studied in the DEM simulation. While the lateral stress and principal stress are dependent on the angle, the orientations of principal stresses and plastic strain rate almost reach the same value at the failure. The contact force network and material fabric are also investigated to provide insight into the micro-scale responses and macro-micro relations regarding bi-directional simple shear.
机译：实验和数值研究了颗粒状材料在双向简单剪切作用下的应力应变响应。可变方向动态循环简单剪切仪用于测试各种载荷路径下的玻璃珠，DEM用于再现实验结果。这两种方法是互补的。对玻璃珠进行第一次剪切，直到达到指定的剪切应变，然后再进行第二次剪切，直到样品破裂为止，并且两个剪切处于不同的角度。实验结果与数值结果吻合良好。实验和数值研究均表明，剪应力的发展在早期取决于两个剪之间的夹角，并且在破坏时它们接近相同的极限值。在DEM仿真中还研究了横向应力，主应力和非同轴性。尽管侧向应力和主应力取决于角度，但在破坏时主应力和塑性应变率的方向几乎达到相同的值。还研究了接触力网络和材料织物，以提供有关双向简单剪切的微观响应和宏观-微观关系的见解。

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  • 来源
    《Granular matter》 |2019年第2期|24.1-24.13|共13页
  • 作者

    Zhang Min; Yang Yunming; Zhang Hanwen; Yu Hai-Sui;

  • 作者单位

    Univ Nottingham Ningbo, Ningbo Nottingham New Mat Inst, Dept Civil Engn, 199 Taikang East Rd, Ningbo 315100, Zhejiang, Peoples R China;

    Univ Nottingham Ningbo, Ningbo Nottingham New Mat Inst, Dept Civil Engn, 199 Taikang East Rd, Ningbo 315100, Zhejiang, Peoples R China;

    Univ Nottingham Ningbo, Ningbo Nottingham New Mat Inst, Dept Civil Engn, 199 Taikang East Rd, Ningbo 315100, Zhejiang, Peoples R China;

    Univ Leeds, Sch Civil Engn, Leeds LS2 9JT, W Yorkshire, England;

  • 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

    Discrete element method; Bi-directional simple shear; Lateral stress; Principal stress rotation; Non-coaxiality; Material fabric;

    机译：离散单元法;双向简单剪力;横向应力;主应力旋转;非同轴;材料;

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