论文标题
X射线断层扫描研究的循环剪切颗粒材料
X-ray tomography investigation of cyclically sheared granular materials
论文作者
论文摘要
我们对具有高瞬态行为的周期性剪切颗粒系统进行X射线断层扫描和剪切力测量，并在剪切周期内获得显微镜结构的演变和宏观剪切力。我们根据微观过程解释了系统的宏观行为，包括粒子水平的结构重排和摩擦接触变化。具体而言，我们展示了接触摩擦如何诱导较大的结构波动并引起颗粒材料的显着剪切膨胀效应，并且我们还为宏观剪切力构建了经验构造关系。
We perform combined X-ray tomography and shear force measurements on a cyclically sheared granular system with highly transient behaviors, and obtain the evolution of microscopic structures and the macroscopic shear force during the shear cycle. We explain the macroscopic behaviors of the system based on microscopic processes, including the particle level structural rearrangement and frictional contact variation. Specifically, we show how contact friction can induce large structural fluctuations and cause significant shear dilatancy effect for granular materials, and we also construct an empirical constitutive relationship for the macroscopic shear force.
