Identification and Validation of a Discrete Element Model for Concrete

Hentz, Sébastien; Daudeville, L.; Donzé, Frédéric

doi:10.1061/(asce)0733-9399(2004)130:6(709)

Cited by 166 publications

(91 citation statements)

References 16 publications

(1 reference statement)

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“…If the value of η is increased above unity, bonds are formed between particles which are not necessarily in direct contact, this is a similar formulation to models [e.g. [34][35][36] but different to others [e.g. 6] where physical particle overlap is required for a bond to form.…”

Section: Bond Initialisationmentioning

confidence: 78%

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: 78%

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

2014

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“…There are two main approaches to DEM : the dual spring model (a pair of normal and tangential springs) (6,7,8,9) and the cohesive beam model (10,11,12). The beam cohesive model is not as well established in the literature as the classical dual spring model.…”

Section: Introductionmentioning

confidence: 99%

Discrete element method to simulate continuous material by using the cohesive beam model

Debenath

Iordanoff

Charles

et al. 2012

Computer Methods in Applied Mechanics and Engineering

168

189

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. AbstractThe mechanical behavior of materials is usually simulated by the continuous mechanics approach. However, simulation of non-continuous phenomena like multi-fracturing is not well adapted to a continuous description. In this case, the discrete element method (DEM) is a good alternative because it naturally takes into account discontinuities.Many researchers have shown interest in this approach for wear and fracture simulation. The problem is that, while DEM is well adapted to simulate discontinuities, it is not suitable to simulate continuous behavior. In problems of wear or fracture, material is composed of continuous parts and discontinuous interfaces. The aim of the present work is to improve the ability of DEM to simulate the continuous part of the material using cohesive bond model.Continuous mechanics laws cannot be used directly within a DEM formulation. A second difficulty is that the volume between the discrete elements creates an artificial void inside the material. This paper proposes a methodology that tackles these theoretical difficulties and simulates, using a discrete element model, any material defined by a Young's modulus, Poisson's ratio and density, to fit the static and dynamic mechanical behavior of the material. The chosen cohesive beam model is shown to be robust concerning the influence of the discrete element sizes. This method is applied to a material which can be considered as perfectly elastic: fused silica.

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“…The DEM is often used to investigate the particle motion and micro-deformation mechanisms of geo-materials. Recently, the DEM has also been applied successfully to many areas of engineering, such as soil mechanics, rock engineering, tunneling, rockfall, and landslide evaluations (Calvetti and Emeriault 1999;Chang et al 2003Chang et al , 2011Hentz et al 2004;Potyondy and Cundall 2004;Cho et al 2007;Hsieh et al 2008;Utili and Nova 2008;Sitharam et al 2008;Wang and Leung 2008;Schopfer et al 2009). The DEM has been implemented in the software PFC (PFC2D 2004).…”

Section: List Of Symbolsmentioning

confidence: 99%

Modeling Particle Rolling Behavior by the Modified Eccentric Circle Model of DEM

2012

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This study proposes a modified eccentric circle model to simulate the rolling resistance of circle particles through the distinct element method (DEM) simulation. The proposed model contains two major concepts: eccentric circle and local rotational damping. The mass center of a circular particle is first adjusted slightly for eccentricity to provide rotational stiffness. Local rotational damping is adopted to dissipate energy in the rotational direction. These associated material parameters can be obtained easily from the rolling behavior of one rod. This study verifies the proposed model with the repose angle tests of chalk rod assemblies, and the simulated results were satisfactory. Simulations using other existing models were also conducted for comparison, showing that the proposed model achieved better results. A landslide model test was further simulated, and this simulation agreed with both the failure pattern and the sliding process. In conclusion, particle rolling simulation using the proposed model appears to approach the actual particle trajectory, making it useful for various applications.

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Identification and Validation of a Discrete Element Model for Concrete

Cited by 166 publications

References 16 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

Discrete element method to simulate continuous material by using the cohesive beam model

Modeling Particle Rolling Behavior by the Modified Eccentric Circle Model of DEM

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