Experiments and numerical simulations with 2D disks assembly

Lanier, J.; Jean, Marcel

doi:10.1016/s0032-5910(99)00237-5

Cited by 48 publications

(28 citation statements)

References 5 publications

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“…Masson and Martinez [18] showed that sample size equal to 7 to 8 times the size of the largest particle was sufficient to obtain a macroscopically representative value when porosity and coordination number were analyzed whilst a size 12 times the largest particle size was required for proper stress tensor evaluation. These results were in agreement with experimental data of Lanier et al [16] and Biarez and Hicher [3].…”

Section: Introductionsupporting

confidence: 93%

Experimental and numerical determination of representative elementary volume for granular plant materials

et al. 2012

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A series of physical and numerical tests were conducted to determine representative elementary volume of granular plant material. The load response of pea grain assembly poured into a cuboid test chamber and subjected to uniaxial confined compression was studied. The apparatus was equipped with adjustable side walls that allowed measurement of boundary stresses in samples of varying thickness. It was found that load distribution varied considerably in samples of thickness smaller than three times the size of the particle. Less pressure variation was observed in grain assemblies of thickness equaled to three, five and seven times the particle size. Comparison between experimental data and numerical DEM results have shown qualitative agreement. It was found that the specimen of dimension not smaller than five times the particle size can be used as a representative elementary volume in confined uniaxial compression test of granular plant materials.

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Section: Introductionsupporting

confidence: 93%

Experimental and numerical determination of representative elementary volume for granular plant materials

et al. 2012

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“…This is in agreement with experimental tests on wooden rods [16] and numerical tests run by other authors. Lanier and Jean [18], for instance, performed biaxial tests on an assembly of rigid non-overlapping disks according to the contact dynamics method using the LMGC software. In Figure 4(b) it is shown that the displacement field obtained from their test is in very good agreement with that obtained by PFC.…”

Section: Biaxial Testmentioning

confidence: 99%

DEM analysis of bonded granular geomaterials

Utili¹,

Nova²

2008

Num Anal Meth Geomechanics

142

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SUMMARYIn this paper, the application of the distinct element method (DEM) to frictional cohesive (c, ) geomaterials is described. A new contact bond model based on the Mohr-Coulomb failure criterion has been implemented in PFC2D. According to this model, the bond strength can be clearly divided into two distinct micromechanical contributions: an intergranular friction angle and a cohesive bond force. A parametric analysis, based on several biaxial tests, has been run to validate the proposed model and to calibrate the micromechanical parameters. Simple relationships between the macromechanical strength parameters (c, ) and the corresponding micromechanical quantities have been obtained so that they can be used to model boundary value problems with the DEM without need of further calibration.As an example application, the evolution of natural cliffs subject to weathering has been studied. Different weathering scenarios have been considered for an initially vertical cliff. Firstly, the case of uniform weathering has been studied. Although unrealistic, this case has been considered in order to validate the DEM approach by comparison against analytical predictions available from limit analysis. Secondly, nonuniform weathering has been studied. The results obtained clearly show that with the DEM it is possible to realistically model boundary value problems of bonded geomaterials, which would be overwhelmingly difficult to do with other numerical techniques.

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“…In contrast to cohesionless granular materials, where the Coulomb friction law and rigid or elastic contact conditions provide a suitable framework for DEM simulations [1][2][3][4], cohesive…”

Section: Introductionmentioning

confidence: 99%

Influence of liquid bridges on the mechanical behaviour of polydisperse granular materials

Soulié

Cherblanc

Youssoufi

et al. 2006

Int. J. Numer. Anal. Meth. Geomech.

198

131

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SUMMARYWe investigate a polydisperse granular material in which the particle interactions are governed by a capillary force law. The cohesion force for a grain-pair with unequal diameters is expressed as an explicit function of the inter-particle distance and the volume of the liquid bridge. This analytical relation is validated by experiments on a reference material. Then, it is completed by a rupture criterion and cast in the form of a force law that accounts for solid contact, capillary force and rupture characteristics of a grain-pair. Finally, in order to evaluate the influence of capillary cohesion on the macroscopic behaviour, radial and axial compression tests on cylindrical assemblies of wet particles are simulated using a 3D distinct element method.

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Experiments and numerical simulations with 2D disks assembly

Cited by 48 publications

References 5 publications

Experimental and numerical determination of representative elementary volume for granular plant materials

Experimental and numerical determination of representative elementary volume for granular plant materials

DEM analysis of bonded granular geomaterials

Influence of liquid bridges on the mechanical behaviour of polydisperse granular materials

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