Abstract
The particle-particle interactions on micro scale determine the macroscopic flow behaviour of bulk solids as in shear testers and in industrial facilities. However, although the flow behaviour can be measured on macro scale and bulk solid facilities as silos can be designed based on reliable engineering knowledge, the microscopic physics causing the wide fluctuation in flow properties of the different bulk solids is still not deeply understood. Therefore, the motion of individual particles in shear testers was determined experimentally as well as by discrete element method (DEM) simulations. The experimental detection of the particle motion was achieved by an own-built micro torsional shear tester which can be placed into a X-ray tomography device (µCT) and a customized statistical analysis method to extract the individual trajectories of almost all particles even at large angle increments of up to 5° between the single tomographic measurements. The two bulk solids, borosilicate glass beads and potassium chloride, with particle sizes in the range of 10–100 µm show very different contact behaviour, on one side viscoelastic with constant adhesion force and on the other side elastoplastic with time dependent adhesion. By a careful calibration of the DEM contact model parameters using among others shear and nanoindentation tests the microscopic behaviour of the two different model materials could be simulated successfully to predict the shear bands and to determine the macroscopic flow properties. Moreover, a theory for the rate dependent rheology of granular materials showing time consolidation has been developed.
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Brendel, L. et al. (2019). Structure of Sheared Cohesive Granular Bulk. In: Antonyuk, S. (eds) Particles in Contact. Springer, Cham. https://doi.org/10.1007/978-3-030-15899-6_20
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DOI: https://doi.org/10.1007/978-3-030-15899-6_20
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