scholarly journals Coarse-grained discrete element method for granular shear flow

2020 ◽  
Vol 4 ◽  
pp. 100050
Author(s):  
Hideya Nakamura ◽  
Hiroharu Takimoto ◽  
Naoki Kishida ◽  
Shuji Ohsaki ◽  
Satoru Watano
Keyword(s):  
Shear Flow ◽  
Discrete Element Method ◽  
Discrete Element ◽  
Coarse Grained ◽  
Granular Shear ◽  
Element Method

scholarly journals Investigating Electrode Calendering and its Impact on Electrochemical Performance by Means of a New Discrete Element Method Model: Towards a Digital Twin of Li-Ion Battery Manufacturing

2020 ◽  
Author(s):  
Alain Ngandjong ◽  
Teo Lombardo ◽  
Emiliano Primo ◽  
Mehdi Chouchane ◽  
Abbos Shodiev ◽  
...  
Keyword(s):  
Discrete Element Method ◽  
Electrochemical Performance ◽  
Active Material ◽  
Lithium Ion ◽  
Discrete Element ◽  
Coarse Grained ◽  
Manufacturing Optimization ◽  
Explicit Consideration ◽  
Method Model ◽  
Element Method

Lithium-ion battery (LIB) manufacturing optimization is crucial to reduce its CO2 fingerprint and cost, while improving their electrochemical performance. In this article, we present an experimentally validated calendering Discrete Element Method model for LiNi0.33Mn0.33Co0.33O2–based cathodes by considering explicitly both active material (AM) and carbon-binder domain (CBD). This model was coupled to a pre-existing Coarse-Grained Molecular Dynamics model describing the slurry equilibration and its drying and a 4D-resolved Finite Element Method model for predicting electrochemical performance. Our calendering model introduces important novelties versus the state of the art, such as the utilization of un-calendered electrode mesostructures resulting from validated simulations of the slurry and drying combined with the explicit consideration of the spatial distribution and interactions between AM and CBD particles, and its validation with both experimental micro-indentation and porosity vs. calendering pressure curves. The effect of calendering on the electrode mesostructure is analyzed in terms of pore size distribution, tortuosity and particles arrangement. In addition, the evolution of the macroscopic electrochemical behavior of the electrodes upon the degree of calendering is discussed, offering added insights into the links between the calendering pressure, the electrode mesostructure and its overall performance.<br>

Smoothed Particle Hydrodynamics and Discrete Element Method Coupling for Influence of Hexagonal Boron Nitride Lubricant Particle on Friction of Elastic Coarse-Grained Micronscale Iron

2021 ◽  
Vol 144 (1) ◽  
Author(s):  
Le Van Sang ◽  
Akihiko Yano ◽  
Ai I. Osaka ◽  
Natsuko Sugimura ◽  
Hitoshi Washizu
Keyword(s):  
Boron Nitride ◽  
Discrete Element Method ◽  
Smoothed Particle Hydrodynamics ◽  
Hexagonal Boron Nitride ◽  
Discrete Element ◽  
Coarse Grained ◽  
Protective Film ◽  
Particle Hydrodynamics ◽  
Smoothed Particle ◽  
Element Method

Abstract The present study uses the smoothed particle hydrodynamics (SPH) and discrete element method (DEM) coupling to investigate influence of the hexagonal boron nitride (hBN) particles on friction of the elastic coarse-grained micronscale iron. The hBN lubricant particles significantly improve the friction performance of iron in various simulation behaviors. The particle size, the air/water background containing the particles, and its temperature result in reduction of the friction coefficient. The surface mending, the protective film, and the energy dissipation are the main mechanisms related to the friction reduction. Additionally, it is worthy to note that the static friction and the kinetic friction can be clearly observed by this elastic coarse-graining.

scholarly journals Impact of Contact Scaling and Drag Calculation on the Accuracy of Coarse‐Grained Discrete Element Method

2020 ◽  
Vol 43 (10) ◽  
pp. 1959-1970
Author(s):  
Nico Jurtz ◽  
Harald Kruggel-Emden ◽  
Oleh Baran ◽  
Ravindra Aglave ◽  
Ray Cocco ◽  
...  
Keyword(s):  
Discrete Element Method ◽  
Discrete Element ◽  
Coarse Grained ◽  
Element Method

Improvement of the Coarse-Grained Discrete Element Method for Frictional Particles

2021 ◽  
Vol 60 (15) ◽  
pp. 5651-5664
Author(s):  
Yaxiong Yu ◽  
Yu Li ◽  
Xiao Chen ◽  
Fan Duan ◽  
Qiang Zhou
Keyword(s):  
Discrete Element Method ◽  
Discrete Element ◽  
Coarse Grained ◽  
Element Method

The Shear Dilation and Shear Band of Coarse Grained Soil Based on Discrete Element Method

2015 ◽  
Vol 744-746 ◽  
pp. 679-685 ◽  
Author(s):  
Zhi Hua Zhang ◽  
Guo Dong Zhang ◽  
Xue Liang Li ◽  
Zhi Hua Xu
Keyword(s):  
Discrete Element Method ◽  
Shear Bands ◽  
Confining Pressure ◽  
Discrete Element ◽  
Coarse Grained ◽  
Biaxial Test ◽  
Confining Stress ◽  
Shear Dilation ◽  
Coarse Grained Soil ◽  
Element Method

Based on the triaxial test of coarse grained soil, using the discrete element method to simulate the biaxial test by using PFC2D as the discrete element method (DEM) tools, and generate particles by a gradation which is similar with that in laboratory. Through self-programming, depends on the macro-reaction in lab to find out the mesoscopic parameters and deformation characteristics of coarse grained soil, then calibrate the value of friction coefficient correspond to that in laboratory, and at last find out the shear bands. The results show that the value of sample volumetric increment ratio (VIR)dεv/dεis positive (shear shrinkage) at first and then negative (shear dilation) when confining stress is 300kPa, when the confining pressure is greater than 300kPa, samples have been on the shear shrinkage.

scholarly journals Investigating Electrode Calendering and its Impact on Electrochemical Performance by Means of a New Discrete Element Method Model: Towards a Digital Twin of Li-Ion Battery Manufacturing

2020 ◽  
Author(s):  
Alain Ngandjong ◽  
Teo Lombardo ◽  
Emiliano Primo ◽  
Mehdi Chouchane ◽  
Abbos Shodiev ◽  
...  
Keyword(s):  
Discrete Element Method ◽  
Electrochemical Performance ◽  
Active Material ◽  
Lithium Ion ◽  
Discrete Element ◽  
Coarse Grained ◽  
Manufacturing Optimization ◽  
Explicit Consideration ◽  
Method Model ◽  
Element Method

Lithium-ion battery (LIB) manufacturing optimization is crucial to reduce its CO2 fingerprint and cost, while improving their electrochemical performance. In this article, we present an experimentally validated calendering Discrete Element Method model for LiNi0.33Mn0.33Co0.33O2–based cathodes by considering explicitly both active material (AM) and carbon-binder domain (CBD). This model was coupled to a pre-existing Coarse-Grained Molecular Dynamics model describing the slurry equilibration and its drying and a 4D-resolved Finite Element Method model for predicting electrochemical performance. Our calendering model introduces important novelties versus the state of the art, such as the utilization of un-calendered electrode mesostructures resulting from validated simulations of the slurry and drying combined with the explicit consideration of the spatial distribution and interactions between AM and CBD particles, and its validation with both experimental micro-indentation and porosity vs. calendering pressure curves. The effect of calendering on the electrode mesostructure is analyzed in terms of pore size distribution, tortuosity and particles arrangement. In addition, the evolution of the macroscopic electrochemical behavior of the electrodes upon the degree of calendering is discussed, offering added insights into the links between the calendering pressure, the electrode mesostructure and its overall performance.<br>

Numerical Simulation of Vibration Compacting Process on Hydrous Embankment by Discrete Element Method

2012 ◽  
Vol 594-597 ◽  
pp. 506-511
Author(s):  
Bao Tao Huang ◽  
Xin Yuan ◽  
Jie Zhou ◽  
Ding Liu
Keyword(s):  
Numerical Simulation ◽  
Discrete Element Method ◽  
Discrete Element ◽  
The Body ◽  
Coarse Grained ◽  
Material Parameters ◽  
Irregular Particle ◽  
Micro Particles ◽  
Simulation Results ◽  
Element Method

In this article, the discrete element method is used to investigate the coarse particle material close-grained space structure evolutionary process submitted to a vibrating compressive load. 2-D generation algorithm about irregular particle generation and particle contact interface generation was adopted. Irregular particles were randomly generated in the designated categories with this algorithm. The microcosmic material parameters are endowed to irregular particle and pore space. The microcosmic material parameters are also endowed to water. The irregular micro-particles close-grained process was been analyzed under vibrating compressive. The numerical simulation results demonstrate that the coarse-grained soil Irregular particles compacting effect of the simulation results with the actual theoretic situation in the basic line. The Irregular particles were whirligig and movement, location of the rearrangement as a whole to show the close-grained process. The use of discrete element method can be clearly informed that the simulation of the embankment particles in the body vibration. This research offers a new idea and continent method for compaction dense of hydrous embankment.

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