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Collaborative Research: A New Theory of 3D Particle Characterization

合作研究：3D 粒子表征的新理论

基本信息

批准号：
1938431
负责人：
Seung Jae Lee
金额：
$ 16.09万
依托单位：
Florida International University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2020
资助国家：
美国
起止时间：
2020-04-01 至 2024-03-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1938431&HistoricalAwards=false
关键词：
Collaborative Research New Theory 3D

项目摘要

Granular materials such as soils are prevalent in nature and broadly used as engineering materials for civil infrastructure (e.g., in dams, levees, roads and railways). 3D particle geometry is a key piece of information to fundamentally understand the granular material behavior subjected to static and dynamic loadings. While the 3D particle geometry is characterized in terms of four features, i.e., volume, surface area, size and shape, the characteristics of the 3D geometry can only be fully understood through the interrelationships of these four features. For example, there is limited understanding of how volume is related to surface area for random mineral particles. This relationship clearly depends on the particle shape as well (e.g., a sphere and an ellipsoid with the same volume have different surface areas). The relationship between these features is therefore key to comprehensively address the four-dimensional aspects of 3D particle geometry, which will enable the fundamental understanding of their combined influence on the behavior of granular materials and will help to better design civil infrastructure against natural hazards such as earthquakes. In addition, this project will develop educational modules for undergraduate classes by closely integrating with the research activities and by using recent advances in 3D printing and scanning technologies. The research team will incorporate the education modules into existing undergraduate level courses in geotechnical and materials engineering. This educational effort will provide a new model for successfully integrating knowledge discovery, teaching and learning in the area of granular materials.This project will develop a new theory for comprehensive 3D particle geometry characterization based on a new, simple formula that correlates the parameters defining the 3D particle geometry. This formula unravels the intertwined relationships between the four particle geometry parameters by expressing the 3D particle morphology as a function of surface area, volume and size. The study develops three research hypotheses to test the new theory step-by-step. The research will (i) characterize individual particles using the researched formula, (ii) characterize particle groups (i.e., granular material) in association with a power law relationship between the surface area and volume, and (iii) perform testing to investigate the relationship between the characterized geometric information using the new approach and various mechanical properties of granular materials, including dilatancy and strength.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

土壤等颗粒材料在自然界中普遍存在，并广泛用作民用基础设施（例如水坝、堤坝、道路和铁路）的工程材料。 3D 颗粒几何形状是从根本上了解颗粒材料在静态和动态载荷作用下的行为的关键信息。虽然 3D 粒子几何形状用四个特征来表征，即体积、表面积、尺寸和形状，但只有通过这四个特征的相互关系才能充分理解 3D 几何形状的特征。例如，对于随机矿物颗粒的体积与表面积之间的关系，人们的了解有限。这种关系显然也取决于颗粒形状（例如，具有相同体积的球体和椭球体具有不同的表面积）。因此，这些特征之间的关系对于全面解决 3D 粒子几何的四维方面至关重要，这将使人们能够从根本上了解它们对颗粒材料行为的综合影响，并有助于更好地设计土木基础设施以抵御地震等自然灾害。此外，该项目还将与研究活动紧密结合，利用3D打印和扫描技术的最新进展，开发本科生课程的教育模块。研究团队将把教育模块纳入现有的岩土和材料工程本科水平课程中。这项教育工作将为成功整合颗粒材料领域的知识发现、教学和学习提供一个新模型。该项目将基于一个新的、与定义 3D 颗粒几何形状的参数相关的简单公式，开发一种用于全面 3D 颗粒几何表征的新理论。该公式通过将 3D 颗粒形态表示为表面积、体积和尺寸的函数，揭示了四个颗粒几何参数之间相互交织的关系。该研究提出了三个研究假设来逐步检验新理论。该研究将（i）使用所研究的公式表征单个颗粒，（ii）与表面积和体积之间的幂律关系相关联地表征颗粒组（即颗粒材料），以及（iii）进行测试以研究使用新方法表征的几何信息与颗粒材料的各种机械性能（包括剪胀性和强度）之间的关系。该奖项反映了 NSF 的法定使命，并通过评估被认为值得支持利用基金会的智力优势和更广泛的影响审查标准。