This is a preview and has not been published.

DEM investigation on strain localization in a dense periodic granular assembly with high coordination number

Authors

  • Trung-Kien Nguyen Faculty of Building and Industrial Construction, Hanoi University of Civil Engineering, 55 Giai Phong road, Hanoi, Vietnam https://orcid.org/0000-0003-0966-1617
  • Thanh-Trung Vo Department of Research and International Affairs, Danang Architecture University, Danang city, Vietnam https://orcid.org/0000-0003-0259-7165
  • Nhu-Hoang Nguyen Faculty of Building and Industrial Construction, Hanoi University of Civil Engineering

DOI:

https://doi.org/10.3221/IGF-ESIS.59.14

Keywords:

Granular materials, DEM, Strain Localization, Periodic Boundary Conditions, Displacement Fluctuation

Abstract

Strain localization is one of key phenomena which have been studied extensively in geomaterials and for different kinds of materials including metals and polymers. This well-known phenomenon appears when structure/material is closed to failure. Theoretical, experimental, and numerical research have been dedicated to this subject for a long while. In the numerical aspects, strain localization inside the periodic granular assembly has not been well studied in the literature. In this paper, we investigate the occurrence and development of strain localization within a dense cohesive-frictional granular assembly with high coordination number under bi-periodic boundary conditions by Discrete Element Modeling (DEM). The granular assembly is composed of 2D circular disks and subjected to biaxial loading with constant lateral pressure. The results show that the formation of shear bands is of periodic type, consistent with the boundary conditions. This formation has the origins of the irreversible losing of cohesive contacts, viewed as micro-crackings which strongly concentrated in the periodic shear zones. This micromechanical feature is therefore strongly related to the strain localization observed at the sample scale. Finally, we also show that the strain localization is in perfect agreement with the sample’s displacement fluctuation fields.

Author Biographies

Trung-Kien Nguyen, Faculty of Building and Industrial Construction, Hanoi University of Civil Engineering, 55 Giai Phong road, Hanoi, Vietnam

Dr. Trung-Kien Nguyen received M.Sc. in Civil Engineering from Ecole Nationale des Travaux Publics de l'Etat (ENTPE, France) in 2010 and PhD degree in Civil Engineering from the University of Grenobles-Alpes in 2013. After a few years working as Research-Engineer in French Geological Survey (Orleans, France) and Grenoble Insitute of Technology (Grenoble, France), since 2019, he is lecturer at the Faculty of Building and Industrial Construction, Hanoi University of Civil Engineering (Hanoi, Vietnam)

His main research interests include the modeling of geomaterials/geomechanics problems and steel-composite structure. He is the author of more than 20 peer-reviewed publications.

Thanh-Trung Vo, Department of Research and International Affairs, Danang Architecture University, Danang city, Vietnam

Dr. Thanh-Trung Vo received PhD degree from the University of Montpellier in 2019. He is currently lecturer and head of department of science and technology of Danang Architecture University.

He is specialized in Rheology and granular texture of complex granular flows, Solid-Liquid interactions  and Discrete Element Method (DEM). He has published more than 10 peer-reviewed articles.

Issue

Section

SI: Steels and Composites for Engineering Structures