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We introduce a new Magnetic Resonance Imaging technique to study the geometry of shear zones of soft, low-frictional and hard, frictional granular materials and their mixtures. Hydrogel spheres serve as the soft, low-frictional material component, while mustard seeds represent rigid, frictional grains. Some of the hydrogel spheres are doped with CuSO 4 salt to serve as tracers. A cylindrical split-bottom cell is sheared stepwise and the shear profiles are determined from the differences of tomograms after successive shear steps, using Particle Imaging Velocimetry and Particle Tracking Velocimetry. We find that the shear zone geometry differs considerably between soft grains submersed in water and the same material without the embedding fluid. Graphic abstract: [Figure not available: see fulltext.].
- Magnetic resonance imaging
- Particle imaging velocimetry (PIV)
- Particle tracking velocimetry (PTV)
- Sheared granular material
- Split-bottom geometry
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- 1 Active
CALIPER: Creating Granular Materials Experts by Developing Experimental Calibrations for Computational Methods
1/09/19 → 29/02/24
Project: EU research project