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Comparison of shear and compression jammed packings of frictional disks

机译：摩擦盘的剪切和压缩堵塞盘根比较

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摘要

We compare the structural and mechanical properties of mechanically stable (MS) packings of frictional disks in two spatial dimensions (2D) generated with isotropic compression and simple shear protocols from discrete element modeling (DEM) simulations. We find that the average contact number and packing fraction at jamming onset are similar (with relative deviations for MS packings generated via simple shear. To investigate the difference in the stress state of MS packings, we develop packing-generation protocols to first unjam the MS packings, remove the frictional contacts, and then rejam them. Using these protocols, we are able to obtain rejammed packings with nearly identical particle positions and stress anisotropy distributions compared to the original jammed packings. However, we find that when we directly compare the original jammed packings and rejammed ones, there are finite stress anisotropy deviations Delta sigma<^>xyThe deviations are smaller than the stress anisotropy fluctuations obtained by enumerating the force solutions within the null space of the contact networks generated via the DEM simulations. These results emphasize that even though the compression and shear jamming protocols generate packings with the same contact networks, there can be residual differences in the normal and tangential forces at each contact, and thus differences in the stress anisotropy.
机译：我们在各向同性压缩和离散元素建模（DEM）模拟的简单剪切方案生成的两个空间尺寸（2D）中比较了摩擦盘的机械稳定（MS）填料的结构和力学性能。我们发现，卡纸开始时的平均接触数和填充率是相似的（通过简单剪切产生的MS填充物具有相对偏差。要研究MS填充物应力状态的差异，我们开发了填充物生成方案以首先消除MS的干扰填料，去除摩擦接触，然后对其进行堵塞，使用这些协议，我们能够获得与原始堵塞填料相比具有几乎相同的颗粒位置和应力各向异性分布的堵塞填料，但是，当我们直接比较原始填料时，我们发现堵塞的填料和堵塞的填料，存在有限的应力各向异性偏差Δσxy，该偏差小于通过枚举由DEM仿真生成的接触网络零空间内的力解而获得的应力各向异性波动。即使压缩和剪切干扰协议生成的填充物具有相同的在完整的网络中，每个接触处的法向力和切向力可能存在残余差异，因此应力各向异性也不同。

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  • 来源
    《Granular matter》 |2019年第4期|109.1-109.14|共14页
  • 作者

    Xiong Fansheng; Wang Philip; Clark Abram H.; Bertrand Thibault; Ouellette Nicholas T.; Shattuck Mark D.; OHern Corey S.;

  • 作者单位

    Tsinghua Univ Zhou Pei Yuan Ctr Appl Math Beijing 100084 Peoples R China|Yale Univ Dept Mech Engn & Mat Sci New Haven CT 06520 USA;

    Yale Univ Dept Mech Engn & Mat Sci New Haven CT 06520 USA;

    Naval Postgrad Sch Dept Phys Monterey CA 93943 USA;

    Imperial Coll London Dept Math South Kensington Campus London SW7 2AZ England;

    Stanford Univ Dept Civil & Environm Engn Stanford CA 94305 USA;

    CUNY City Coll Benjamin Levich Inst New York NY 10031 USA|CUNY City Coll Dept Phys New York NY 10031 USA;

    Yale Univ Dept Mech Engn & Mat Sci New Haven CT 06520 USA|Yale Univ Dept Phys New Haven CT 06520 USA|Yale Univ Dept Appl Phys New Haven CT 06520 USA;

  • 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; Jamming; Friction; Shear jamming; Force chains;

    机译：粒状材料;干扰摩擦;剪力干扰;力量链;

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