Reverse Janssen effect in narrow granular columns
Abstract
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.
Cite
@article{arxiv.2005.14404,
title = {Reverse Janssen effect in narrow granular columns},
author = {Shivam Mahajan and Michael Tennenbaum and Sudhir N. Pathak and Devontae Baxter and Xiaochen Fan and Pablo Padilla and Caleb Anderson and Alberto Fernandez-Nieves and Massimo Pica Ciamarra},
journal= {arXiv preprint arXiv:2005.14404},
year = {2020}
}
Comments
Supplementary material included; Editor suggestion; Featured in Physics