论文标题
狭窄颗粒柱中的詹森效应
Reverse Janssen effect in narrow granular columns
论文作者
论文摘要
当将谷物添加到气缸中时，底部的重量小于柱的总重量，该重量由侧壁通过壁/晶粒摩擦力部分支撑。这被称为詹森效应。通过合并的实验和数值研究，我们在这里证明了詹森的反向效应，从而使基础支持的权重的比例克服了。我们表征了这种现象对所涉及的各种控制参数的依赖性，将负责造成异常的压缩摩擦力出现的物理过程合理化，并引入了一个模型来重现我们的发现。与先前的假设相反，我们的结果表明，材料元素的构型关系可以取决于所施加的应力。
When grains are added to a cylinder, the weight at the bottom is smaller than the total weight of the column, which is partially supported by the lateral walls through wall/grain frictional forces. This is known as the Janssen effect. Via a combined experimental and numerical investigation, here we demonstrate a reverse Jansen effect whereby the fraction of the weight supported by the base overcomes one. We characterize the dependence of this phenomenon on the various control parameters involved, rationalize the physical process responsible for the emergence of the compressional frictional forces responsible for the anomaly, and introduce a model to reproduce our findings. Contrary to prior assumptions, our results demonstrate that the constitutive relation on a material element can depend on the applied stress.
