Instability behavior of loose granular material: a new perspective via DEM

IF 2.4 3区工程技术 Granular Matter Pub Date : 2024-08-05 DOI:10.1007/s10035-024-01457-9

Liang Huang, Qing-lu Deng, Huai-nuo Wang

引用次数: 0

Abstract

The effects of the stress loading rate and maximum servo wall speed on the instability characteristics of granular materials were investigated using stress-controlled biaxial compression simulation. The results indicate that: (1) the stress loading rate affects the destabilization process of the specimen, with a higher stress loading rate making it easier for the sample to destabilize in a shorter time. (2) The maximum servo wall speed impacts the shear behavior of the specimen and can even lead to simulation test failure. It is therefore strongly recommended that this parameter be listed as a key parameter in future studies. (3) Based on the above analysis, a new conceptual framework was proposed to characterise the different cases of stress-controlled tests, which can guide the rational selection of rates.

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松散颗粒材料的不稳定性：通过 DEM 的新视角

利用应力控制双轴压缩模拟研究了应力加载速率和最大伺服壁速度对颗粒材料失稳特性的影响。结果表明(1) 应力加载速率影响试样的失稳过程，应力加载速率越大，试样越容易在较短时间内失稳。(2）最大伺服壁速度会影响试样的剪切行为，甚至会导致模拟试验失败。因此强烈建议在今后的研究中将该参数列为关键参数。(3) 基于上述分析，我们提出了一个新的概念框架，用于描述应力控制试验的不同情况，从而指导合理选择速率。

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来源期刊

Granular Matter MATERIALS SCIENCE, MULTIDISCIPLINARY-MECHANICS

CiteScore

4.30

自引率

8.30%

发文量

期刊介绍： Although many phenomena observed in granular materials are still not yet fully understood, important contributions have been made to further our understanding using modern tools from statistical mechanics, micro-mechanics, and computational science. These modern tools apply to disordered systems, phase transitions, instabilities or intermittent behavior and the performance of discrete particle simulations. >> Until now, however, many of these results were only to be found scattered throughout the literature. Physicists are often unaware of the theories and results published by engineers or other fields - and vice versa. The journal Granular Matter thus serves as an interdisciplinary platform of communication among researchers of various disciplines who are involved in the basic research on granular media. It helps to establish a common language and gather articles under one single roof that up to now have been spread over many journals in a variety of fields. Notwithstanding, highly applied or technical work is beyond the scope of this journal.