NDA@SZTAKI

Evolution of shear zones in granular materials

Szabó, Balázs

Török, János

Somfai, Ellák

Wegner, Sandra

Stannarius, Ralf

Böse, Axel

Rose, Georg

Angenstein, Frank

Börzsönyi, Tamás

American Physical Society

2014-09-10

QC01 Mechanics / mechanika

The evolution of wide shear zones (or shear bands) was investigated experimentally and numerically for quasistatic dry granular flows in split bottom shear cells. We compare the behavior of materials consisting of beads, irregular grains (e.g. sand) and elongated particles. Shearing an initially random sample, the zone width was found to significantly decrease in the first stage of the process. The characteristic shear strain associated with this decrease is about unity and it is systematically increasing with shape anisotropy, i.e. when the grain shape changes from spherical to irregular (e.g. sand) and becomes elongated (pegs). The strongly decreasing tendency of the zone width is followed by a slight increase which is more pronounced for rod like particles than for grains with smaller shape anisotropy (beads or irregular particles). The evolution of the zone width is connected to shear induced density change and for nonspherical particles it also involves grain reorientation effects. The final zone width is significantly smaller for irregular grains than for spherical beads.

angol

Article

PeerReviewed

info:eu-repo/semantics/article

text

http://real.mtak.hu/40899/1/szabo-pre-2014.pdf

Szabó, Balázs and Török, János and Somfai, Ellák and Wegner, Sandra and Stannarius, Ralf and Böse, Axel and Rose, Georg and Angenstein, Frank and Börzsönyi, Tamás (2014) Evolution of shear zones in granular materials. PHYSICAL REVIEW E - STATISTICAL, NONLINEAR AND SOFT MATTER PHYSICS, 90. 032205. ISSN 1539-3755

http://real.mtak.hu/40899/

http://dx.doi.org/10.1103/PhysRevE.90.032205

10.1103/PhysRevE.90.032205