连接颗粒材料的微观和宏观力学行为

Qianchuan Zhao, Y. Chen, G. Ma
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引用次数: 0

摘要

了解导致颗粒系统稳定性丧失的潜在物理和机制对于减轻滑坡和地震等地质灾害至关重要。我们使用x射线微计算机断层扫描(micro-CT)下的原位测试和混合有限和离散元方法(FDEM)的组合来研究颗粒材料从微观到宏观尺度的力学行为。我们对颗粒柱样品进行了微型三轴试验,该样品用x射线微ct在增量应变步骤下成像。然后,通过球谐(SH)分析表征和重建颗粒的多尺度形态特征,并将其用于创建被测样品的数字孪生。FDEM模拟在定量上与实验观测到的整体响应一致。我们发现颗粒材料的塑性变形是通过大的非仿射位移的空间局部区域进行的,这些区域的时空演变控制着系统的宏观响应。我们的方法揭示了从微观尺度到宏观颗粒系统的桥接长度尺度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Bridging the Micro and Macro Mechanical Behaviour of Granular Materials
Understanding the underlying physics and mechanisms responsible for the loss of stability of granular systems is crucial to the mitigation of geohazards such as landslides and earthquakes. We use a combination of in situ testing under X-ray micro-computed tomography (micro-CT) and the hybrid finite and discrete element method (FDEM) to investigate the mechanical behaviours of granular materials from the microscopic to the macroscopic scales. We conduct a miniature triaxial test on a granular column sample that is imaged with X-ray micro-CT at incremental strain steps. Then, spherical harmonic (SH) analysis is performed to characterize and reconstruct the multi-scale morphological characteristics of particles, which was used to create the digital twin of the tested sample. FDEM simulation quantitatively agrees with the overall response observed in the experiment. We find that the granular material deforms plastically through spatially localized zones of large nonaffine displacements, and the spatiotemporal evolution of these zones controls the macroscopic responses of the system. Our method sheds light on bridging length scales from microscopic scale to macroscopic granular systems.
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