BPCPPDYSOE21 – wissenschaftliches Programm
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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. Kollmer2,3,4, Thorsten Pöschel3, Michael Salamon1, •Matthias Schröter3,5, Tara Shreve3,6, 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)