Refined modeling and movement characteristics analyses of irregularly shaped particles |
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| Authors: | Y W Zeng L Jin X Du R Gao |
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| Affiliation: | 1. School of Civil Engineering, Wuhan University, Wuhan, China;2. Urban Rail & Underground Engineering Design & Research Dept, China Railway SIYUAN Survey and Design Group Co., Ltd., Wuhan, China |
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| Abstract: | Irregularly shaped (IRS) particles widely exist in many engineering and industrial fields. The macro physical and mechanical properties of the particle system are governed by the interaction between the particles in the system. The interaction between IRS particles is more complicated because of their complex geometric shape with extremely irregular and co‐existed concave and convex surfaces. These particles may interlock each other, making the sliding and friction of IRS particles more complex than that of particles with regular shape. In order to study the interaction of IRS particles more efficiently, a refined method of constructing discrete element model based on computed tomography scanning of IRS particles is proposed. Three parameters were introduced to control the accuracy and the number of packing spheres. Subsequently, the inertia tensor of the IRS particle model was optimized. Finally, laboratory and numerical open bottom cylinder tests were carried out to verify the refined modeling method. The influence of particle shape, particle position, and mesoscopic friction coefficient on the interaction of particles was also simulated. It is noteworthy that with the increase of mesoscopic friction coefficient, the fluidity of IRS particle assembly decreases, and intermittent limit equilibrium state may appear. Copyright © 2014 John Wiley & Sons, Ltd. |
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| Keywords: | irregularly shaped (IRS) particles discrete element method (DEM) movement characteristics interaction mechanism |
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