Validation of DEM using macroscopic stress-strain behavior and microscopic particle motion in sheared granular assemblies

Usman Ali, Mamoru Kikumoto, Matteo Oryem Ciantia, Ying Cui

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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 languageEnglish
Title of host publication15th World Congress on Computational Mechanics & 8th Asian Pacific Congress on Computational Mechanics
Subtitle of host publicationBook of Abstracts
Place of PublicationBarcelona
PublisherInternational Center for Numerical Methods in Engineering
Pages2020
Number of pages1
ISBN (Print)9788412322286
Publication statusPublished - 2022
Event15th 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 20225 Aug 2022
https://www.wccm2022.org/

Conference

Conference15th World Congress on Computational Mechanics and 8th Asian Pacific Congress on Computational Mechanics
Abbreviated titleWCCM-APCOM 2022
Country/TerritoryJapan
CityYokohama
Period31/07/225/08/22
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

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