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SOME OPEN PROBLEMS IN GRANULAR MATTER MECHANICS

机译：颗粒物力学中的一些开放问题

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摘要

Granular matter is a large assemblage of solid particles, which is fundamentally different from any other type of matters, such as solid and liquid. Most models presented for granular matter are phenomenological and only suitable for solving engineering problems. Many fundamental mechanical problems still remain open. By analyzing characteristics of internal state structure, we propose that granular matter is intrinsically multi-scale, i.e. microseale of particle size, mesoscale of force chain and macroscale of the bulk of granular matter. The correlations among difference scale would be crucial. The mesoscale force chain network is determined both by particle properties and macroscopic boundary conditions. The evolution of force chain network contributes to macroscopic mechanical properties of granular matter. Besides, we discuss drawbacks in simplifying contact forces in current modells, and difficulties in analyzing the interaction of interstitial fluid in wet granular matter. As an appropriate application of granular matter, debris flow could be studied with granular matter mechanics; meanwhile debris flow brings more challenges which certainly motivate future studies on granular matter.
机译：粒状物质是固体颗粒的大集合，与根本上与任何其他类型的物质（例如固体和液体）不同。提出的大多数颗粒物质模型都是现象学的，仅适用于解决工程问题。许多基本的机械问题仍然存在。通过分析内部状态结构的特征，我们认为粒状物质本质上是多尺度的，即粒径的微观尺度，力链的中尺度和粒状物质的宏观尺度。差异量表之间的相关性至关重要。中尺度力链网络由颗粒性质和宏观边界条件决定。力链网络的演变有助于颗粒物质的宏观力学性能。此外，我们讨论了简化当前模型中的接触力的缺点，以及分析间隙颗粒在湿颗粒物质中相互作用的困难。作为颗粒物的适当应用，可以利用颗粒物力学研究泥石流。同时，泥石流带来了更多挑战，这些挑战无疑会激发未来对颗粒物的研究。

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  • 来源
  • 会议地点 Beijing(CN)
  • 作者

    YANG Zhuquan;

  • 作者单位

    Qicheng Sun@State Key Laboratory for Hydroscience and Engineering, Tsinghua University, Beijing 100084,China--Guangqian Wang@State Key Laboratory for Hydroscience and Engineering, Tsinghua University, Beijing 100084,China--Kaiheng Hu@Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China--;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng;chi
  • 中图分类 物理学;
  • 关键词

    Granular matter; Multi-scale mechanics; Force chain; Contact mechanics; Debris flow;

    机译：颗粒物;多尺度力学;力链;接触力学;泥石流;

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