Regensburg 2016 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 28: Poster - Complex Fluids, Granular Matter, Glasses
DY 28.11: Poster
Dienstag, 8. März 2016, 18:15–21:00, Poster C
Mechanical properties of sheared wet granular piles — •Anna-Lena Hippler1, Marc Schaber1, Somnath Karmakar1, Mario Scheel3, Marco DiMichiel3, Martin Brinkmann2, and Ralf Seemann1,2 — 1Experimental Physics, Saarland University, 66041 Saarbruecken, Germany — 2MPI for Dynamics and Self-Organization, Am Faßberg 17, 37077 Goettingen, Germany — 3European Synchrotron Radiation Facility, 6 rue Jules Horowitz, 38000 Grenoble, France
The mechanical properties of dry and wet bead packs are explored when being sheared with a parabolic profile at constant shear volume. The dissipated energy can be determined from the measured differential pressure and increases about linearly with external pressure for both dry and wet bead packs. However, the dissipated energy for wet beads has a finite value for vanishing external pressure and increases slower with external pressure compared to dry beads.
Using a downsized version of the shear cell the reorganization of beads and liquid is imaged using ultrafast x-ray micro-tomography. The movement of each bead can be tracked during the shear process. The relative movement of the beads causes the breakup of liquid capillary bridges and the liquid that was stored in the liquid bridges is redistributing within the bead pack. The contribution of the breaking capillary bridges to the dissipated energy can be quantified by directly detecting individual rupture events and analyzing the corresponding liquid bridge volumes.