论文标题
稳定剪切中的速率依赖性棍棒：颗粒固体和流体之间过渡的标志
Rate-dependent Stick-slips in Steady Shearing: Signature of Transition between Granular Solid and Fluid
论文作者
论文摘要
尽管对平滑的颗粒流动流或在慢速极限处的固体变形进行了广泛研究，但这两个极端之间的变化仍未得到探索。通过系统地研究在稳定剪切下紧密堆积的颗粒的波动，我们确定了一个具有突出的棒滑雪雪崩的过渡区。我们建立了一个状态图，并根据粒子间摩擦和粒径的速度依赖性提出了一个新的无尺寸剪切速率。由于固定体积限制并以粘性数字$ j $数十年的固定体积限制在报道的值中，我们回答了一个颗粒系统如何过渡到固体摩擦持续的固体摩擦，这超出了基于悬浮悬浮液的现有范式。
Despite extensive studies on either smooth granular-fluid flow or the solid-like deformation at the slow limit, the change between these two extremes remains largely unexplored. By systematically investigating the fluctuations of tightly packed grains under steady shearing, we identify a transition zone with prominent stick-slip avalanches. We establish a state diagram, and propose a new dimensionless shear rate based on the speed dependence of inter-particle friction and particle size. With fluid-immersed particles confined in a fixed volume and forced to "flow" at viscous numbers $J$ decades below reported values, we answer how a granular system can transition to the regime sustained by solid-to-solid friction that goes beyond existing paradigms based on suspension rheology.
