Influence of aspect ratio and arrangement direction on the shear behavior of ellipsoids |
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| Institution: | 1. School of Civil Engineering, Chongqing University, Chongqing 400045, China;2. School of Transportation, Southeast University, Nanjing 210096, China;1. Department of Civil and Environmental Engineering, Universidad de los Andes, Carrera 1Este #19A-40, Bogota, Colombia;2. Department of Chemical Engineering, University of the Basque Country, Barrio Sarriena s/n, Leioa, Spain;1. School of Environmental Science and Engineering, Donghua University, Shanghai 201620, China;2. School of Physics and Electronic-Electrical Engineering, Ningxia University, Yinchuan 750021, China;1. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;2. Department of Chemical & Biochemical Engineering, Western University, London, Ontario N6A 3K7, Canada;3. Institute of Shaoxing, Tianjin University, Zhejiang 312300, China;1. State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China;2. Guangdong Provincial Key Laboratory of Distributed Energy Systems, School of Chemical Engineering and Energy Technology, Dongguan University of Technology, Dongguan 523808, China |
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| Abstract: | This work studies the macroscopic and microscopic behaviors of ellipsoids under triaxial tests using 3D discrete element method (DEM) simulation. To avoid the boundary effect, a novel stress servo-controlled periodic boundary condition is proposed to maintain the confining pressure of samples during testing. The shape features of ellipsoids are investigated, including the aspect ratio of elongated/oblate ellipsoids and the initial arrangement directions of ellipsoids. The macroscopic properties of ellipsoidal particle samples, such as the deviatoric stress, volumetric strain, internal friction angle, as well as dilatancy angles are explored. Elongated and oblate ellipsoids with varying aspect ratios are investigated for the occurrence of stick-slips. In addition, it is demonstrated that the initial arrangement direction has a significant impact on the coordination number and contact force chains. The corresponding anisotropy coefficients of the entire contact network are analyzed to probe the microscopic roots of macroscopic behavior. |
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| Keywords: | DEM Shear Ellipsoid Periodic boundary condition Arrangement direction Aspect ratio |
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