论文标题
振动的细粉床中的分解波传播
Decompaction-wave propagation in a vibrated fine powder bed
论文作者
论文摘要
我们在实验中研究了由直径为5μm的玻璃珠组成的振动粉末床中的裂纹形成和分解波传播。振动的粉末床根据振动条件表现出三个不同的阶段：固结（CS），静态断裂（SF）和动态断裂（DF）。特别是，当粉末床强烈振动时，我们在DF状态下发现了向上的波传播。作为一个了不起的特征，我们发现在精细的粘性粉末中，分解波传播速度归一化为重力速度与摇动强度无关。该结果意味着波传播速度受重力和内聚力效应之间的平衡而不是振动强度的影响。我们还探索了波浪传播现象的普遍性，在更粗的和低密度的颗粒粉末中。
We experimentally study the crack formation and decompaction-wave propagating in a vibrated powder bed consisting of glass beads of 5 μm in diameter. The vibrated powder bed exhibits three distinct phases depending on the vibration conditions: consolidation (CS), static fracture (SF), and dynamic fracture (DF). Particularly, we found an upward wave propagation in the DF regime when the powder bed is strongly vibrated. As a remarkable feature, we found that in fine cohesive powders, the decompaction-wave propagation speed normalized to gravitational speed is independent of the shaking strength. This result implies that the wave propagation speed is governed by the balance between gravity and cohesion effect rather than vibration strength. We also explore the universality of wave propagation phenomenon in coarser and low-density granular powders.
