Frictional characteristics of granular system under high pressure
| Autor: | Guo-jiang Dong, Changcai Zhao, Miao-yan Cao, Bing Du, Ya-xin Peng |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Materials science
integumentary system media_common.quotation_subject Granule (cell biology) Metals and Alloys General Engineering Mechanics Inertia 01 natural sciences Discrete element method Surface friction 010305 fluids & plasmas High pressure 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics Geotechnical engineering Direct shear test Shear velocity 010306 general physics media_common Dimensionless quantity |
| Zdroj: | Journal of Central South University. 23:1132-1141 |
| ISSN: | 2227-5223 2095-2899 |
| Popis: | In order to reveal the force transmission features of the granules in the solid granule medium forming (SGMF) technology, the frictional characteristics of the non-metallic granule medium (NGM) under high pressure were investigated by tests and simulations. And the relevant changing curves of the internal friction coefficient of the granular system under different normal pressures were obtained by self-designed shear test. By the granule volume compression test, the accurate discrete element simulation parameters were obtained, based on this, the discrete element method (DEM) was adopted to reveal the evolution law of the NGM granules movement in the sample shear process from the microscopic view. Based on the DEM, the influence of granule diameter, surface friction coefficient, normal pressure and shear velocity on the internal friction coefficient of the granular system were studied. And the parameters were conducted to be dimensionless by introducing the inertia coefficient. Finally, the expression showing power-law relationship of inertia coefficient, surface friction coefficient and internal friction coefficient is obtained. |
| Databáze: | OpenAIRE |
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