Issue 44, 2021

Stress propagation in locally loaded packings of disks and pentagons

Abstract

The mechanical strength and flow of granular materials can depend strongly on the shapes of individual grains. We report quantitative results obtained from photoelasticimetry experiments on locally loaded, quasi-two-dimensional granular packings of either disks or pentagons exhibiting stick-slip dynamics. Packings of pentagons resist the intruder at significantly lower packing fractions than packings of disks, transmitting stresses from the intruder to the boundaries over a smaller spatial extent. Moreover, packings of pentagons feature significantly fewer back-bending force chains than packings of disks. Data obtained on the forward spatial extent of stresses and back-bending force chains collapse when the packing fraction is rescaled according to the packing fraction of steady state open channel formation, though data on intruder forces and dynamics do not collapse. We comment on the influence of system size on these findings and highlight connections with the dynamics of the disks and pentagons during slip events.

Graphical abstract: Stress propagation in locally loaded packings of disks and pentagons

Supplementary files

Article information

Article type
Paper
Submitted
04 Aug 2021
Accepted
25 Oct 2021
First published
28 Oct 2021

Soft Matter, 2021,17, 10120-10127

Stress propagation in locally loaded packings of disks and pentagons

R. Kozlowski, H. Zheng, K. E. Daniels and J. E. S. Socolar, Soft Matter, 2021, 17, 10120 DOI: 10.1039/D1SM01137E

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