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Abstract
Validation and/or calibration of distinct element method (DEM) models is usually performed by comparing element test simulation results with the corresponding stress-strain relationships observed in the laboratory [1]. However, such a validation procedure performed at the macroscopic level does not ensure capturing the microscopic particle-level motion [2]. Thus, the reliability of the DEM model may be limited to some stress paths and may not hold when the material response becomes non-uniform for example when shear bands develop. In this study, the validity of the DEM is assessed by comparing the numerical result with experimental data considering both particle-scale behavior (including particle rotations) and macroscopic stress-strain characteristics observed in shearing tests on granular media. Biaxial shearing tests were conducted on bi-disperse granular assemblies composed of around 2700 circular particles under different confining pressures. Particle-level motions were detected by a novel image analysis technique. Particle rotations are observed to be a key mechanism for the deformation of granular materials. The results from this study suggest that to properly calibrate DEM models able to capture the mechanical behavior in a more realistic way particle scale motions observed in laboratory experiments along with macroscopic response are necessary.
Original language | English |
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Title of host publication | 15th World Congress on Computational Mechanics & 8th Asian Pacific Congress on Computational Mechanics |
Subtitle of host publication | Book of Abstracts |
Place of Publication | Barcelona |
Publisher | International Center for Numerical Methods in Engineering |
Pages | 2020 |
Number of pages | 1 |
ISBN (Print) | 9788412322286 |
Publication status | Published - 2022 |
Event | 15th World Congress on Computational Mechanics and 8th Asian Pacific Congress on Computational Mechanics: Pursuing the Infinite Potential of Computational Mechanics - Yokohama, Japan Duration: 31 Jul 2022 → 5 Aug 2022 https://www.wccm2022.org/ |
Conference
Conference | 15th World Congress on Computational Mechanics and 8th Asian Pacific Congress on Computational Mechanics |
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Abbreviated title | WCCM-APCOM 2022 |
Country/Territory | Japan |
City | Yokohama |
Period | 31/07/22 → 5/08/22 |
Internet address |
Keywords
- Biaxial shearing
- granular material
- microscopic mechanism
- numerical simulation
- particle rotation
ASJC Scopus subject areas
- Computational Theory and Mathematics
- Computer Science Applications
- Mechanical Engineering
- Mechanics of Materials
Fingerprint
Dive into the research topics of 'Validation of DEM using macroscopic stress-strain behavior and microscopic particle motion in sheared granular assemblies'. Together they form a unique fingerprint.Projects
- 1 Finished
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Soil Liquefaction Within Shear Bands Induced by Grain Crushing and its Detrimental Consequence on Landslide Ranoff Distance
Brennan, A. (Investigator) & Ciantia, M. (Investigator)
16/09/20 → 15/09/22
Project: Research