On the determination and evolution of fabric in representative elementary volumes for a sand specimen in triaxial compression

IF 2.3 3区工程技术 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Granular Matter Pub Date : 2022-08-09 DOI:10.1007/s10035-022-01262-2

Selma Schmidt, Max Wiebicke, Ivo Herle

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引用次数: 1

Abstract

The soil response in triaxial compression tests, that are commonly treated as element tests, is known to be inhomogeneous. Several studies have revealed the localisation of deformation throughout the whole specimen by digital image correlation techniques on X-ray tomographies. The fabric of a soil specimen has so far only been studied on complete specimens as a bulk measurement or in chosen subsets. In this contribution, we present a study on the spatial and temporal distribution of the fabric throughout one Hostun sand sample in triaxial compression. Therefore, we calibrated the minimum representative element size first for three chosen fabric variables considering three different criteria. By distributing the elements in a regular grid over the specimen, we are able to clearly identify the onset of the localisation in terms of void ratio, coordination number and contact fabric anisotropy. Spatially and temporally the contact fabric variables precede the void ratio changes as they are much more sensitive to small changes.

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三轴压缩条件下典型砂样基本体积结构的测定与演化

众所周知，通常被视为单元试验的三轴压缩试验中的土壤响应是不均匀的。几项研究揭示了通过x射线断层摄影的数字图像相关技术在整个标本中的变形定位。到目前为止，土壤样品的结构只在完整的样品上作为散装测量或在选定的子集上进行了研究。在这一贡献中，我们提出了织物在三轴压缩下的时空分布的研究。因此，我们首先根据三个不同的标准为三个选定的织物变量校准最小代表性元素尺寸。通过在试样上以规则的网格分布元素，我们能够在空隙比、配位数和接触织物各向异性方面清楚地识别局部化的开始。在空间和时间上，接触织物变量先于空隙率变化，因为它们对微小的变化更为敏感。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Granular Matter Materials Science-General Materials Science

CiteScore

4.60

自引率

8.30%

发文量

审稿时长

6 months

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.