干沙类颗粒材料的跨尺度力学性质研究

颗粒材料广泛存在于自然界和人类的生产和生活中。如何表征颗粒材料的力学性能是力学学科重要的前沿基础科学问题。同时，我国探月工程中的月壤钻取采样与干沙类颗粒材料的力学性能密切相关。本项目以建立干沙类颗粒材料多尺度模型为科学目标，发展连续介质理论框架下颗粒材料的数值计算方法和颗粒流的实验观测技术。面向我国重大工程项目需求，研究与月壤采样密切相关的螺旋钻进动力学，揭示运动学条件、土壤力学性质和微重力环境等因素对颗粒输运性能的作用机理。本项目的研究成果将不仅丰富颗粒材料力学的理论体系，而且将为我国重大航天工程项目提供有力的技术支撑。

Granular matter is ubiquitous in nature and plays an important role to human society. How to characterize its mechanical properties is a fundamental issue at the frontier of mechanics discipline. Meanwhile, the use of drilling tools to sample lunar soil, which is a core task in the next lunar exploration of China, is also closely related to the mechanical properties of dry granular materials. The goals of this project are to establish the multi-scale model of dry granular materials, to study the numerical algorithm in the framework of continuum mechanics, and to develop the experimental techniques for observing the flow motion of dry granular materials. On the other hand, this project will study the drilling dynamics of a helix auger penetrating into lunar soil to meet the requirements of China lunar exploration project. The drilling process is concerned with the transport behavior of dry granular materials, which is significantly influenced by auger geometry, tool movement, soil mechanical properties, and space environment. This study will greatly enrich the theory of granular mechanics, and will provide an important technical support for China’s aerospace projects.