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Creep of granular materials

机译：颗粒状材料的蠕变

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摘要

This paper examines the creep of brittle granular materials subjected to one-dimensional compression. One-dimensional creep tests were performed on aggregates of brittle pasta and compared with the behaviour of sand at much higher stress levels. It was found that for both materials, creep strain is proportional to the logarithm of time. One possible mechanism for creep is particle crushing. However, it is usually difficult to measure changes in the particle size distribution during creep because the fines produced are so small, and the mass of fines is too small to measure accurately unless creep is permitted for a very long time. However, for pasta, the particle fragments produced are large, and it is found that particle crushing does occur during creep for 24 hours. This is consistent with the proposition that the behaviour of all brittle granular materials is essentially the same. A micro mechanical argument is then summarised which predicts that creep strain should be proportional to log time.
机译：本文研究了承受一维压缩的脆性粒状材料的蠕变。对脆性面食的骨料进行了一维蠕变测试，并将其与高应力水平下的沙子行为进行了比较。发现对于两种材料，蠕变应变与时间的对数成正比。蠕变的一种可能机制是颗粒破碎。但是，通常很难测量蠕变过程中粒度分布的变化，因为所产生的细粉非常小，并且除非允许长时间蠕变，否则细粉的质量太小而无法精确测量。但是，对于面食，产生的颗粒碎片很大，并且发现在蠕变24小时时确实发生了颗粒压碎。这与所有脆性粒状材料的行为基本相同的主张是一致的。然后总结了一个微机械参数，该参数预测蠕变应变应与对数时间成正比。

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  • 来源
    《Granular matter》 |2003年第3期|p. 115-120|共6页
  • 作者

    G. R. McDowell; J. J. Khan;

  • 作者单位

    School of Civil Engineering, University of Nottingham, NG7 2RD, UK;

    School of Civil Engineering, University of Nottingham, NG7 2RD, UK;

  • 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 工程材料学;
  • 关键词

    Creep; Fracture; Micro mechanics;

    机译：蠕变;断裂;微力学;

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