Comparative study of different discrete element models and evaluation of equivalent micromechanical parameters

Rojek, Jerzy; Labra, Carlos; Su, Okan; Oñate, Eugenio

doi:10.1016/j.ijsolstr.2012.02.032

Cited by 89 publications

(54 citation statements)

References 37 publications

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“…The literature reports many different ways in which the bond radius can be determined, for example either using the arithmetic or harmonic means of the two particles' radii [5]. In the implementation presented here, if a bond is considered to connect particles A and B (as shown in Fig.…”

Section: Bond Initialisationmentioning

confidence: 99%

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A bond model for DEM simulation of cementitious materials and deformable structures

2014

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There is an increasing use of the discrete element method (DEM) to study cemented (e.g. concrete and rocks) and sintered particulate materials. The chief advantage of the DEM over continuum based techniques is that it does not make assumptions about how cracking and fragmentation initiate and propagate, since the DEM system is naturally discontinuous. The ability for the DEM to produce a realistic representation of a cemented granular material depends largely on the implementation of an inter-particle bonded contact model. This paper presents a new bonded contact model based on the Timoshenko beam theory which considers axial, shear and bending behaviour of the bond. The bond model was first verified by simulating both the bending and dynamic response of a simply supported beam. The loading response of a concrete cylinder was then investigated and compared with the Eurocode equation prediction. The results show significant potential for the new model to produce satisfactory predictions for cementitious materials. A unique feature of this model is that it can also be used to accurately represent many deformable structures such as frames and shells, so that both particles and structures or deformable boundaries can be described in the same DEM framework.

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Section: Bond Initialisationmentioning

confidence: 99%

“…It is the behaviour at the contacts which influences the overall mechanical behaviour. One of the main concerns when using the DEM is to ensure that the appropriate contact laws and microscopic parameters are used to represent the subject material at the macroscopic scale [5].…”

Section: Introductionmentioning

confidence: 99%

A bond model for DEM simulation of cementitious materials and deformable structures

2014

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“…Different contact models have been proposed to represent different contact behaviour [8,9,10]. In this study, a formulation for spherical elements following the original assumptions presented by Cundall and Strack [11] is used, considering a linear elastic contact model with a constant stiffness [12]. A Velocity Verlet algorithm is used for the time integration scheme [13,14].…”

Section: The Discrete Element Methodsmentioning

confidence: 99%

Numerical analysis of impact events in a centrifugal impact pin mill

Labra

Ooi

Chen

et al. 2013

AIP Conference Proceedings

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Abstract. Milling is an important operation in many industries, such as mining and pharmaceutical. Although the comminution process during milling has been extensively studied, the material fragmentation mechanisms in a mill are still not well understood partly because of the lack of an understanding on the local stressing and dynamic information under operational conditions in mills.This paper presents a DEM simulation of particle dynamics and impact events in a centrifugal impact pin mill. The main focus is the statistical characteristics of the dominant stressing modes during the milling process. The frequency, velocity and force of the different impact events between particles and mill components, or between particles, are analysed.

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“…In the case of LM, the relation between the elastic normal force F e n and penetration u e n of outer particles surfaces is linear and it can be represented by the formula [17]:…”

Section: Formulation Of Discrete Element Modelmentioning

confidence: 99%

Application of the Hertz formulation in the discrete element model of pressure-assisted sintering

et al. 2017

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This paper presents the numerical modelling of initial powder compaction and pressure-assisted sintering performed by original viscoelastic discrete element model. The research is focused on the influence of the type of the model representing an elastic part of interparticle force. Two elastic contact models-linear and nonlinear Hertz modelhave been implemented and used to analyse interaction of NiAl powder particles during compaction and sintering process. Numerical models have been validated using own experimental results. Microscopic effects (particle penetration) and macroscopic changes (relative density) have been compared. It has been shown that although both models represent properly macroscopic behaviour of the material at the sintering process, the Hertz model produces the results closer to the real experimental ones during the initial compaction stage. Evaluation of macroscopic quantities enables implementation of the discrete element model in the framework of the multiscale modelling framework which is currently developed for sintering processes.

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Comparative study of different discrete element models and evaluation of equivalent micromechanical parameters

Cited by 89 publications

References 37 publications

A bond model for DEM simulation of cementitious materials and deformable structures

A bond model for DEM simulation of cementitious materials and deformable structures

Numerical analysis of impact events in a centrifugal impact pin mill

Application of the Hertz formulation in the discrete element model of pressure-assisted sintering

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