关键词: 颗粒介质, 持续剪切, 扭矩涨落行为, 堵塞密度

Abstract: The aims of this work were to study and utilize the mechanics response characteristics of granular media under continuous shear. For this purpose, a novel type of coupling（containing confined granular media/filled with steel balls）was designed to study the torque fluctuation behaviors, and a method then was developed to regulate and control the torque transmission characteristics. A specially-designed continuous shear device with pressure applied in the axial direction was adopted, and a series of experiments with different settings of low shear speed, initial normal stress, and packing height were carried out on the torsion testing machine to obtain the torque transmission characteristics of the coupling. The experimental results show that under continuous shear, the evolution of shear deformation of the granular media has a close relationship with the jamming density φJ, where the novel experimental device may provide a theoretically viable measuring method. Further insights from the study suggest that: by selecting an appropriate set of shear speed, initial normal stress, and packing height, the expected speed-sensitive torque transmission characteristic may be achieved in the confined granular media coupling. Controlling of φJ enables the regulation of torque fluctuation behaviors within the coupling.

Key words: granular media, continuous shear, torque fluctuation behavior, jamming density