Yang Hao, Li Xu, Zhang Junhui, Hu Zhengbo, Li Shengnan
Key Laboratory of Highway Engineering of Ministry of Education, Changsha University of Science & Technology, Changsha 410114, China.
School of Traffic and Transportation Engineering, Changsha University of Science and Technology, Changsha 410114, China.
Materials (Basel). 2024 Nov 27;17(23):5805. doi: 10.3390/ma17235805.
The morphology of an individual particulate refers to its shape characteristics and size properties, which both play important roles for granular matter in physics, mechanics, chemistry, and biology. In this study, ellipsoidality is defined as a 3D shape index for evaluating particle roundness, and an explicit calculation method is applied. The dependences of 3D shape characteristics (aspect ratios, sphericity, and ellipsoidal degree) on particle size (ranges from 0.063 mm to 5.0 mm) are adequately investigated with the X-ray micro-computed microtomography (uCT) imaging for hundreds of thousands of particles of crushed and natural sands. This study focuses on comparing and evaluating the specific surface area and equivalent diameter, suggesting that particle segregation and changes in surface area may explain the strong dependence of particle shape on size. The correlation between different shape metrics was analyzed by comparing crushed sand with natural sand to provide theoretical support for material filling and mechanical behaviour. The significant differences in the microscale particle size indexes of different sands by single grading are used to provide data references for further analyses of the effect of material microscale on material properties in future discrete element particle simulations.
单个颗粒的形态学是指其形状特征和尺寸特性，这两者在物理学、力学、化学和生物学中对颗粒物都起着重要作用。在本研究中，椭球度被定义为评估颗粒圆度的三维形状指数，并应用了一种明确的计算方法。利用X射线显微计算机断层扫描（μCT）成像技术，对数十万颗破碎砂和天然砂颗粒的三维形状特征（纵横比、球度和椭球度）与颗粒尺寸（范围从0.063毫米到5.0毫米）之间的相关性进行了充分研究。本研究重点比较和评估了比表面积和等效直径，表明颗粒离析和表面积变化可能解释了颗粒形状对尺寸的强烈依赖性。通过将破碎砂与天然砂进行比较，分析了不同形状指标之间的相关性，为材料填充和力学行为提供理论支持。不同单一粒径砂的微观尺度颗粒尺寸指标的显著差异，为未来离散元颗粒模拟中进一步分析材料微观尺度对材料性能的影响提供了数据参考。
