Approach to structural anisotropy in compacted cohesive powder |
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Authors: | S Strege A Weuster H Zetzener L Brendel A Kwade D E Wolf |
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Affiliation: | 1. Institute for Particle Technology, Technische Universit?t Braunschweig, Brunswick, Germany 2. CeNIDE, Universit?t Duisburg-Essen, Duisburg, Germany
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Abstract: | We investigate the mesoscopic regime between microscopic particle properties and macroscopic bulk behavior and present a complementary approach of physical experiments and discrete element method simulations to explore the development of the microstructure of cohesive powders during compaction. On the experimental side, a precise micro shear tester \((\mu \hbox {ST})\) for very small powder samples has been developed and integrated into a high resolution X-ray microtomography (XMT) system. The combination of \(\mu \hbox {ST}\) and XMT provides the unique possibility to access the 3D microstructure and the particle network inside manipulated powder samples experimentally. In simulations we explore the structural changes resulting from compaction: a Hertzian contact model is utilized for compaction of an isotropic initial configuration created by a geometrical algorithm. As a first result of this approach we present the analysis of the compaction of slightly cohesive \(\hbox {SiO}_2\) particles with special regard to bulk density, heterogeneity, compaction law and structural anisotropy. |
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