Study on micromechanical behavior and energy evolution of granular material generated by latent diffusion model under rotation of principal stresses

IF 4.1 2区材料科学 Q2 ENGINEERING, CHEMICAL

Particuology Pub Date : 2024-11-02 DOI:10.1016/j.partic.2024.10.015

Jichen Zhong , Junxing Zheng , Lin Gao , Qixin Wu , Zhenchang Guan , Shuangping Li , Dong Wang

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Abstract

In this study, advanced image processing technology is used to analyze the three-dimensional sand composite image, and the topography features of sand particles are successfully extracted and saved as high-quality image files. These image files were then trained using the latent diffusion model (LDM) to generate a large number of sand particles with real morphology, which were then applied to numerical studies. The effects of particle morphology on the macroscopic mechanical behavior and microscopic energy evolution of sand under complex stress paths were studied in detail, combined with the circular and elliptical particles widely used in current tests. The results show that with the increase of the irregularity of the sample shape, the cycle period and radius of the closed circle formed by the partial strain curve gradually decrease, and the center of the circle gradually shifts. In addition, the volume strain and liquefaction strength of sand samples increase with the increase of particle shape irregularity. It is particularly noteworthy that obvious vortex structures exist in the positions near the center where deformation is severe in the samples of circular and elliptical particles. However, such structures are difficult to be directly observed in sample with irregular particles. This phenomenon reveals the influence of particle morphology on the complexity of the mechanical behavior of sand, providing us with new insights into the understanding of the response mechanism of sand soil under complex stress conditions.

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主应力旋转条件下潜伏扩散模型生成的颗粒材料的微机械行为和能量演化研究

本研究采用先进的图像处理技术对三维沙粒合成图像进行分析，成功提取了沙粒的地形特征并保存为高质量的图像文件。然后利用潜扩散模型（LDM）对这些图像文件进行训练，生成大量具有真实形态的沙粒，并将其应用于数值研究。结合当前试验中广泛使用的圆形和椭圆形颗粒，详细研究了颗粒形态对复杂应力路径下砂的宏观力学行为和微观能量演化的影响。结果表明，随着试样形状不规则程度的增加，部分应变曲线所形成的闭合圆的周期和半径逐渐减小，圆心逐渐偏移。此外，砂样的体积应变和液化强度随颗粒形状不规则度的增加而增加。特别值得注意的是，在圆形和椭圆形颗粒样品中，变形严重的中心附近位置存在明显的涡旋结构。然而，在不规则颗粒样品中很难直接观察到这种结构。这一现象揭示了颗粒形态对砂土力学行为复杂性的影响，为我们理解砂土在复杂应力条件下的响应机制提供了新的视角。

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来源期刊

Particuology 工程技术-材料科学：综合

CiteScore

6.70

自引率

2.90%

发文量

1730

审稿时长

32 days

期刊介绍： The word ‘particuology’ was coined to parallel the discipline for the science and technology of particles. Particuology is an interdisciplinary journal that publishes frontier research articles and critical reviews on the discovery, formulation and engineering of particulate materials, processes and systems. It especially welcomes contributions utilising advanced theoretical, modelling and measurement methods to enable the discovery and creation of new particulate materials, and the manufacturing of functional particulate-based products, such as sensors. Papers are handled by Thematic Editors who oversee contributions from specific subject fields. These fields are classified into: Particle Synthesis and Modification; Particle Characterization and Measurement; Granular Systems and Bulk Solids Technology; Fluidization and Particle-Fluid Systems; Aerosols; and Applications of Particle Technology. Key topics concerning the creation and processing of particulates include: -Modelling and simulation of particle formation, collective behaviour of particles and systems for particle production over a broad spectrum of length scales -Mining of experimental data for particle synthesis and surface properties to facilitate the creation of new materials and processes -Particle design and preparation including controlled response and sensing functionalities in formation, delivery systems and biological systems, etc. -Experimental and computational methods for visualization and analysis of particulate system. These topics are broadly relevant to the production of materials, pharmaceuticals and food, and to the conversion of energy resources to fuels and protection of the environment.