Simultaneous fluid and solid density measurements in swelling clay using X‐ray microtomography and 3D particle tracking

IF 1.8 3区材料科学 Q2 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Strain Pub Date : 2020-11-22 DOI:10.1111/str.12373

F. Bernachy-Barbe, Kevin Alvarado

引用次数: 2

Abstract

In order to demonstrate the safety of engineered barriers for radwaste geological repositories, rich characterisations of bentonite hydro‐mechanical behaviour are essential. X‐ray computed tomography was used as the single input to measure both the full displacement field and water content in a heterogeneous bentonite sample resaturated in quasi‐isochoric conditions. Since large texture changes do not allow the use of digital volume correlation, this was achieved using 3D particle tracking to provide the kinematics in combination with calibrated and beam hardening‐corrected grey levels. Matching the grey level sampling with kinematics using a mesh‐based analysis, results show the development of heterogeneous swelling inside the cell and a final solid density gradient in the direction of water flow.

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使用X射线显微成像和3D粒子跟踪同时测量膨胀粘土中的流体和固体密度

为了证明放射性废物地质储存库的工程屏障的安全性，丰富的膨润土水力力学行为特征是必不可少的。X射线计算机断层扫描作为单一输入，测量了准等时条件下复饱和的非均质膨润土样品的全位移场和含水量。由于大的纹理变化不允许使用数字体积相关性，这是通过使用3D粒子跟踪来提供结合校准和光束硬化校正灰度的运动学来实现的。使用基于网格的分析将灰度采样与运动学相匹配，结果显示细胞内的非均匀膨胀和水流方向的最终固体密度梯度的发展。

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

Strain 工程技术-材料科学：表征与测试

CiteScore

4.10

自引率

4.80%

发文量

期刊介绍： Strain is an international journal that contains contributions from leading-edge research on the measurement of the mechanical behaviour of structures and systems. Strain only accepts contributions with sufficient novelty in the design, implementation, and/or validation of experimental methodologies to characterize materials, structures, and systems; i.e. contributions that are limited to the application of established methodologies are outside of the scope of the journal. The journal includes papers from all engineering disciplines that deal with material behaviour and degradation under load, structural design and measurement techniques. Although the thrust of the journal is experimental, numerical simulations and validation are included in the coverage. Strain welcomes papers that deal with novel work in the following areas: experimental techniques non-destructive evaluation techniques numerical analysis, simulation and validation residual stress measurement techniques design of composite structures and components impact behaviour of materials and structures signal and image processing transducer and sensor design structural health monitoring biomechanics extreme environment micro- and nano-scale testing method.