ANALYSIS OF STATIC ANGLE OF REPOSE WITH RESPECT TO POWDER MATERIAL PROPERTIES

• Main Authors: Oliver Macho, Karin Demková, Ľudmila Gabrišová, Matúš Čierny, Jitka Mužíková, Paulína Galbavá, Žofia Nižnanská, Jaroslav Blaško, Peter Peciar, Roman Fekete, Marián Peciar
• Format: Article
• Language: English
• Published: CTU Central Library 2020-03-01
• Series: Acta Polytechnica
• Subjects: angle of repose, cohesion, powders, angle of internal friction, bulk density.
• Online Access: https://ojs.cvut.cz/ojs/index.php/ap/article/view/5846
• ISSN: 1210-2709; 1805-2363

This paper investigates the Angle of Repose (AoR) of powder materials with respect to their morphological and rheological properties. Glass beads, sand, flour and semolina of different particle sizes were used as the experimental materials. The investigated material was analysed with respect to particle shape and size. The rheological properties of the material were obtained by a shear cell test. The AoR was analysed in terms of cohesion, bulk density, particle size and circularity. More cohesive materials such as the flour samples exhibited the largest AoR > 40°, indicating their poor flowability. Glass bead samples with a high circularity value had significantly lower AoR than the flour. The Angle of Internal Friction values were not dependent on those of the AoR. Using a dimensional analysis, a mathematical model was developed to determine the AoR values based on the material properties. By the application of this model, highly accurate calculation of the value of AoR is made possible.