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Experimental Study on Depositing Arch Jamming of Elliptical Disks in a Two-Dimensional Static Hopper

Published online by Cambridge University Press:  14 April 2016

Y.-J. Lin  and
C. Fang
Y.-J. Lin
Affiliation:
Department of Civil Engineering National Cheng Kung University Tainan, Taiwan
C. Fang*
Affiliation:
Department of Civil Engineering National Cheng Kung University Tainan, Taiwan
*
*Corresponding author (cfang@mail.ncku.edu.tw)
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Abstract

Depositing arch jamming of elliptical disks at the opening of a two-dimensional static hopper is studied experimentally. The hopper slope and opening width, and the aspect ratio of elliptical disks, are varied to determine their influence on the jamming probability. The jamming probability increases as the aspect ratio increases for gentle hopper slopes, while fluctuations of jamming probability appear for more steeper hopper slopes. Increasing hopper slope decreases the jamming probability in most cases. Most jamming arches result from the strong force chains along the shorter axes of elliptical disks. The disk number consisting of jamming arches decreases as the hopper slope increases. For smaller hopper openings, it decreases as the aspect ratio increases, whilst a nearly reverse tendency appears for elliptical disks with smaller aspect ratios. The study delivers a physical mechanism of jamming phenomena in depositing elliptical disks in a two- dimensional static hopper.

Keywords

Elliptical disksJamming probabilityStatic hopper
Type
Research Article
Information
Journal of Mechanics , Volume 32 , Issue 6 , December 2016 , pp. 709 - 716
Copyright
Copyright © The Society of Theoretical and Applied Mechanics 2016 

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