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DY: Fachverband Dynamik und Statistische Physik

DY 13: Granular Physics 3 - organized by Matthias Sperl (Köln)

DY 13.5: Vortrag

Montag, 22. März 2021, 16:20–16:40, DYc

Migrating shear bands in shaken granular matter — Joelle Claussen¹, Stefan Gerth¹, Jonathan E. Kollmer^2,3,4, Thorsten Pöschel³, Michael Salamon¹, •Matthias Schröter^3,5, Tara Shreve^3,6, and Norman Uhlmann¹ — ¹Fraunhofer-Entwicklungszentrum Röntgentechnik, Flugplatzstr. 75, 90768 Fürth, Germany — ²Experimentelle Astrophysik, Universität Duisburg-Essen, Lotharstr. 1-21, 47057 Duisburg, Germany — ³Institute for Multiscale Simulation of Particulate Systems, Cauerstr. 3, 91058 Erlangen, Germany — ⁴Dept. of Physics, 2401 Stinson Drive, North Carolina State University, Raleigh, NC 27695, USA — ⁵Max Planck Institute for Dynamics and Self-Organization, 37077 Göttingen, Germany — ⁶Université de Paris, Institut de physique du globe de Paris, CNRS, F-75005, Paris, France

When dense granular matter is sheared, the strain is often localized in shear bands. After some initial transient these shear bands become stationary. Here we introduce a setup that periodically creates horizontally aligned shear bands which then migrate upwards through the sample. Using X-Ray radiography we demonstrate that this effect is caused by dilatancy, the reduction in volume fraction occurring in sheared dense granular media. Further on, we argue that these migrating shear bands are responsible for the previously reported periodic inflating and collapsing of the material.

Ref.: Kollmer et al. Phys. Rev. Lett. 125, 048001 (2020)