Shearing of granular materials in a confined split-bottom Couette cell

Formation of shear bands is one of the most remarkable phenomena in the dynamics of granular matter. Several parameters have been so far identified to influence the behavior of the shear bands. We carried out experiments to investigate the evolution of the shear bands in the split-bottom Couette cel...

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Bibliographic Details
Published in:EPJ Web of conferences 2021-01, Vol.249, p.3004
Main Authors: Madani, Mahnoush, Maleki, Maniya, Shaebani, M. Reza
Format: Article
Language:English
Subjects:
Angular velocity
Confining
Edge dislocations
External pressure
Free surfaces
Granular materials
Parameter identification
Particle image velocimetry
Shear bands
Shear zone
Shearing
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Summary:Formation of shear bands is one of the most remarkable phenomena in the dynamics of granular matter. Several parameters have been so far identified to influence the behavior of the shear bands. We carried out experiments to investigate the evolution of the shear bands in the split-bottom Couette cell in the presence of confining pressure. We employed the Particle Image Velocimetry (PIV) to characterize the shear band both in the absence and presence of external pressure. Our results show that the location and width of the shear band are affected by both the confining pressure and the filling height. The shear zone evolves towards the middle of the cylinder and expands to a broader region with increasing applied pressure or filling height; also the angular velocity decreases relative to the rotation rate of the bottom disk. Our findings are consistent with prior empirical observations on the formation of wide shear bands at free surfaces.
ISSN:2100-014X
2101-6275
2100-014X
DOI:10.1051/epjconf/202124903004