Discrete modelling results of a direct shear test for granular materials versus FE results

Kozicki, J.; Niedostatkiewicz, Maciej; Tejchman, J.; Mühlhaus, H. B.

doi:10.1007/s10035-013-0423-y

Cited by 69 publications

(40 citation statements)

References 53 publications

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“…The DEM calculations were performed with the three-dimensional spherical discrete element model YADE, which was developed at University of Grenoble [31,32]. The model was successfully used for describing the behaviour of different engineering materials with a granular structure (mainly of granular materials by taking shear localization into account [33][34][35][36]). It demonstrated also its usefulness to fracture simulations in concrete [21].…”

Section: Introductionmentioning

confidence: 99%

Modelling of concrete fracture at aggregate level using FEM and DEM based on X-ray μCT images of internal structure

Skarżyński

Nitka

Tejchman

2015

Engineering Fracture Mechanics

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156

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Section: Introductionmentioning

confidence: 99%

Modelling of concrete fracture at aggregate level using FEM and DEM based on X-ray μCT images of internal structure

Skarżyński

Nitka

Tejchman

2015

Engineering Fracture Mechanics

Self Cite

156

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“…Thus, it is not sufficient to merely determine the initial appearance of shear localisation: post-localisation behaviour must also be incorporated in the formulation to achieve robust model predictions.There are higher-order formulations (e.g. Cosserat theory [7,8]) that seem to regularise numerical models and thus allow analysis of post-localisation behaviour. However, these formulations are hypotheses that have yet to gain, from physical experimental tests, the level of veracity expected of any established theory.…”

mentioning

confidence: 99%

Micromechanics of vortices in granular media: connection to shear bands and implications for continuum modelling of failure in geomaterials

Tordesillas

Pucilowski

Walker

et al. 2014

Num Anal Meth Geomechanics

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SUMMARYRecent analysis of data from triaxial tests on sand and discrete element simulations indicate the final pattern of failure is encoded in grain motions during the nascent stages of loading. We study vortices that are evident from grain displacements at the start of loading and bear a direct mathematical connection to boundary conditions, uniform continuum strain and shear bands. Motions of three grains in mutual contact, that is, 3‐cycles, manifest vortices. In the initial stages of loading, 3‐cycles initiate a rotation around a region Ω* where the shear band ultimately develops. This bias sets a course in 3‐cycle evolution, determining where they will more likely collapse. A multiscale spatial analysis of 3‐cycle temporal evolution provides quantitative evidence that the most stable, persistent 3‐cycles degrade preferentially in Ω*, until essentially depleted when the shear band is fully formed. The transition towards a clustered distribution of persistent 3‐cycles occurs early in the loading history—and coincides with the persistent localisation of vortices in Ω*. In 3D samples, no evidence of spatial clustering in persistent 3‐cycle deaths is found in samples undergoing diffuse failure, while early clustering manifests in a sample that ultimately failed by strain localisation. This study not only delivered insights into the possible structural origins of vortices in dense granular systems but also a tool for the early detection of the mode of failure—localised versus diffuse—a sample will ultimately undergo. Copyright © 2014 John Wiley & Sons, Ltd.

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“…Discrete element methods (DEM) have been widely used to study the rotational behavior in granular materials [4,14,18, 24,27,37,39]. In order to apply the rotation averaging method on discrete particles, two DEM simulations of plane strain tests with different boundary conditions are carried out.…”

Section: Discrete Element Methods Simulationsmentioning

confidence: 99%

A general rotation averaging method for granular materials

Lin

2017

Granular Matter

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In order to study the rotational behavior of granular materials, rotation averaging methods are required. Most of the existing rotation averaging methods are only for 2D cases and limited by the shape, position and size of the averaging volumes. Hence, a general rotation averaging method is proposed in this paper. Our approach is simple yet works for both 2D and 3D cases with very little restriction. The performance of this method is shown by both hypothetical examples and DEM simulations of plane strain tests with different boundary conditions.

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Discrete modelling results of a direct shear test for granular materials versus FE results

Cited by 69 publications

References 53 publications

Modelling of concrete fracture at aggregate level using FEM and DEM based on X-ray μCT images of internal structure

Modelling of concrete fracture at aggregate level using FEM and DEM based on X-ray μCT images of internal structure

Micromechanics of vortices in granular media: connection to shear bands and implications for continuum modelling of failure in geomaterials

A general rotation averaging method for granular materials

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