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

摘要： 利用颗粒介质持续剪切下的力学响应特性设计了新型联轴器，探明了联轴器的扭矩涨落行为，进而实现扭矩传递特性的调控。通过设计专用轴向施压持续剪切实验装置，利用扭转实验台开展系列实验，获取低速范围内不同剪切速率、初始法向应力以及颗粒堆积厚度下围限颗粒介质联轴器的扭矩传递特性。实验结果表明颗粒介质持续剪切变形过程与堵塞密度φJ相关，并且该实验装置从原理上提供了堵塞密度的一种可能的测量方法。研究结果进一步表明：对剪切速率、初始法向应力以及颗粒堆积厚度等因素进行选择，可实现围限颗粒介质预期的具有速度敏感性的扭矩传递特性；通过对堵塞密度的控制，可实现围限颗粒介质联轴器扭矩涨落特性的调节。

关键词: 颗粒介质, 持续剪切, 扭矩涨落行为, 堵塞密度