LAPSE:2019.0849
Published Article
LAPSE:2019.0849
Calibration of Discrete-Element-Method Parameters for Cohesive Materials Using Dynamic-Yield-Strength and Shear-Cell Experiments
Subhodh Karkala, Nathan Davis, Carl Wassgren, Yanxiang Shi, Xue Liu, Christian Riemann, Gary Yacobian, Rohit Ramachandran
July 30, 2019
This study tested the effectiveness of using dynamic yield strength (DYS) and shear-cell experiments to calibrate the following discrete-element-method (DEM) parameters: surface energy, and the coefficients of sliding and rolling friction. These experiments were carried out on cohesive granules, and DEM models were developed for these experiment setups using the JKR cohesion contact model. Parameter-sensitivity analysis on the DYS model showed that the DYS results in the simulations were highly sensitive to surface energy and were also impacted by the values of the two friction coefficients. These results indicated that the DYS model could be used to calibrate the surface energy parameter once the friction coefficients were fixed. Shear-cell sensitivity analysis study found that the influence of surface energy on the critical-state shear value cannot be neglected. It was inferred that the shear-cell model has to be used together with the DYS model to identify the right set of friction parameters. Next, surface energy was calibrated using DYS simulations for a chosen set of friction parameters. Calibrations were successfully conducted for simulations involving experimentally sized particles, scaled-up particles, a different shear modulus, and a different set of friction parameters. In all these cases, the simulation DYS results were found to be linearly correlated with surface energy and were within 5% of the experimental DYS result. Shear-cell simulations were then used to compare calibrated surface-energy values for the scaled-up particles with the experimentally sized particles. Both the simulations resulted in similar critical-state shear values. Finally, it was demonstrated that a combination of DYS and shear-cell simulations could be used to compare two sets of friction parameters and their corresponding calibrated surface energy values to identify the set of parameters that better represent the flow behavior demonstrated by the experimental system.
Keywords
calibration, cohesion, discrete-element method, dynamic yield strength, JKR model, shear cell
Suggested Citation
Karkala S, Davis N, Wassgren C, Shi Y, Liu X, Riemann C, Yacobian G, Ramachandran R. Calibration of Discrete-Element-Method Parameters for Cohesive Materials Using Dynamic-Yield-Strength and Shear-Cell Experiments. (2019). LAPSE:2019.0849
Author Affiliations
Karkala S: Department of Chemical and Biochemical Engineering, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, USA
Davis N: School of Chemical Engineering, Purdue University, West Lafayette, IN 47907, USA
Wassgren C: School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907, USA
Shi Y: BASF Corporation, Beachwood, OH 23700, USA
Liu X: BASF Corporation, Beachwood, OH 23700, USA
Riemann C: BASF Corporation, 67056 Ludwigshafen, Germany
Yacobian G: BASF Corporation, Beachwood, OH 23700, USA
Ramachandran R: Department of Chemical and Biochemical Engineering, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, USA
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Journal Name
Processes
Volume
7
Issue
5
Article Number
E278
Year
2019
Publication Date
2019-05-13
Published Version
ISSN
2227-9717
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Original Submission
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PII: pr7050278, Publication Type: Journal Article
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LAPSE:2019.0849
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doi:10.3390/pr7050278
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Jul 30, 2019
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Calvin Tsay
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