论文标题
粒状介质中圆柱入侵者的阻力：横向与轴向侵入和高晶粒分散性效应的实验研究
Drag force on cylindrical intruders in granular media: Experimental study of lateral vs axial intrusion and high grain-polydispersity effects
论文作者
论文摘要
我们报告了通过固体缸穿透玻璃珠的颗粒床所经历的实验测量的阻力力，包括特别是高度多分散的样品，其晶粒尺寸在1-100μm的范围内。我们考虑了横向和轴向侵入的病例，其中圆柱体的长轴分别在水平和垂直上保持。我们探索拖曳力的不同行为方式，这是穿透深度的函数。在横向侵入中，在运动有效地进行了准二维，我们与整个深度范围内的现有理论预测进行了定量比较。在轴向侵入中，我们观察到在各种侵入速度和不同圆柱体直径的范围内的力深度分布中的特殊起伏。我们认为这些起伏反映了高度多分散样品中的一般剪切故障，并且可以根据半定量水平的最终轴承能力理论来理解。
We report on experimentally measured drag force experienced by a solid cylinder penetrating a granular bed of glass beads including, specifically, a highly polydisperse sample with grain sizes in the range 1-100 μm. We consider both cases of lateral and axial intrusion in which the long axis of the cylinder is held horizontally and vertically, respectively. We explore different regimes of behavior for the drag force as a function of the penetration depth. In lateral intrusion, where the motion is effectively quasi-two-dimensional, we establish quantitative comparisons with existing theoretical predictions across the whole range of depths. In axial intrusion, we observe peculiar undulations in the force-depth profiles in a wide range of intrusion speeds and for different cylinder diameters. We argue that these undulations reflect general shear failure in the highly polydisperse sample and can be understood based on the ultimate bearing capacity theory on a semiquantitative level.
