National Repository of Grey Literature 3 records found  Search took 0.00 seconds. 
The Effect of Collision Parameters and Particle Diameter on Dynamics and Mixing Process of Granular Material by using Discrete Element Method.
Kozakovič, M. ; Paříková, A. ; Trávníčková, Tereza ; Kohout, M. ; Havlica, Jaromír
This contribution is focused on mixing dynamics and homogenization process of the granular material via Discrete Element Method. The simulation is conducted by using open-source code LIGGGHTS. The mixing process of approximately forty-two thousand monodisperse spherical particles is simulated in a vertical cylindrical mixer with two opposed flat blades. The rake angle of blades is 45°. The mixing process was studied with varying blade rotational speed (from 15 rpm to 540 rpm), coefficient of friction (from 0.05 to 0.9), coefficient of restitution (0.1 to 1.0), Poisson’s ratio (0.1 to 0.45) and particle diameter (2mm, 4 mm). Each of simulated processes was performed for 80 stirrer revolutions.\n\n\n\n
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Plný tet: SKMBT_C22018100509470 - Download fulltextPDF
Breaking of Rod-shaped Model Material during Compression.
Kulaviak, Lukáš ; Pěnkavová, Věra ; Růžička, Marek ; Punčochář, Miroslav ; Zámostný, P. ; Grof, Z. ; Štěpánek, F. ; Schöngut, M. ; Havlica, Jaromír
The breakage of a model anisometric dry granular material caused by uniaxial compression was studied. The bed of uniform rod-like pasta particles (8 mm long, aspect ratio 1:8) was compressed (Gamlen Tablet Press) and their size distribution was measured after each run (Dynamic Image Analysing). The compression dynamics was recorded and the effect of several parameters was tested (rate of compression, volume of granular bed, pressure magnitude and mode of application). Besides the experiments, numerical modelling of the compressed breakable material was performed as well, employing the DEM approach (Discrete Element Method). The comparison between the data and the model looks promising.
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Plný tet: SKMBT_C22018011012170 - Download fulltextPDF
Time Instability of Lateral Earth Pressure
Koudelka, Petr
Contemporaneously probably the most important result of the physical experiments with granular material (sand), i.e. the finding of the phenomenon of lateral pressure time instability and its tendency.

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