Grain breakage under uniaxial compression using a three-dimensional discrete element method

Nader, François; Silvani, Claire; Djéran-Maigre, Irini

doi:10.1007/s10035-017-0737-2

Cited by 13 publications

(7 citation statements)

References 29 publications

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“…Figure 2 exemplifies the resultant samples at different density states. The minimum ratio of the sample dimension to the largest particle diameter of all samples is larger than 10, which is the minimum recommended value to limit the effect of boundary conditions [34,35].…”

Section: The Simulation Proceduresmentioning

confidence: 99%

Revealing Correlations Between Size Polydispersity and Deformability of Idealized Granular Materials using DEM

Han

Zhang

et al. 2022

Preprint

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This paper numerically investigates the deformability of granular materials with emphasis on the influence of particle size polydispersity. Triaxial compression tests are simulated using distinct element method (DEM) on a set of samples consisting of uncrushable spheres following a variety of grain size distributions. The compressibility under isotropic compression and deformation modulus during triaxial shearing are examined to correlate with the size polydispersity. The results show that, given the same relative density, the compressibility and deformation modulus is insensitive to the grain-size conditions under consideration, but the void ratio is significantly influenced by the size polydispersity. A grading index proposed by the authors is employed to quantify the size polydispersity and correlate with the deformation parameters. Compared with the more conventional coefficient of uniformity, this grading index exhibits a better performance for faithfully representing size polydispersity. An empirical prediction model for the deformation modulus is developed to account for the effect of the size polydispersity, in addition to the confining pressure and void ratio. Although this model exhibits a fair performance for predicting the deformation modulus, it is considered promising in accounting for the effect of size polydispersity. At the microscale, a unique correlation is found between the deformation modulus and the mechanical average coordination number, which can be estimated from the effective void ratio.

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Section: The Simulation Proceduresmentioning

confidence: 99%

Revealing Correlations Between Size Polydispersity and Deformability of Idealized Granular Materials using DEM

Han

Zhang

et al. 2022

Preprint

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“…From then onwards, the particles interact with each other by contact and friction. Diametral compression tests were conducted on a single grain geometry with varying cohesions, and on grains of different sizes (figure 2) [6]. The local cohesive surface is kept constant as the maximum grain size increases, meaning that the number of subgrains (tetrahedral particles) increases with the grain size.…”

Section: Breakable Grain Model and Single Grain Compression Testmentioning

confidence: 99%

“…The scale effect could be simulated by the model (the breakage stress decreases as the grain size increases and the probability of finding a defect in the volume increases), according to Weibull's probability of failure theory [8]. Additional tests to evaluate the sensibility of the grain's mesh (number of subgrains) were studied and showed that the breakage force is proportional to the size of the subgrains' cohesive surface as expected [6].…”

Section: Fig 1 Sample Of Randomly Generated Breakable Grainsmentioning

confidence: 99%

Oedometric compression of a granular material: computation of energies involved during breakage with a discrete element modelling

2021

Self Cite

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A numerical model able to simulate the grain breakage with the discrete element method, using the “Non-Smooth Contact Dynamics” is presented. The model reproduces 3D grains having complex shapes and is tested in single grain and in oedometric compressions. Numerical simulations are then carried out to evaluate the different energies active during breakage (surface creation and redistribution energies). The surface creation energy is estimated. Results are closed to the ones found in the literature.

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“…Coarse-grained soil (CGS) has been widely used in earth-rockfill dams due to high shear strength and compaction capacity [1][2][3][4]. The accurate grasp of engineering properties of CGS is of significance to dam safety.…”

Section: Introductionmentioning

confidence: 99%

A stress dilatancy relationship for coarse-grained soils incorporating particle breakage

Jun-gao

et al. 2021

Granular Matter

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The energy consumption of particle breakage is added to the Cambridge energy balance equation so that the energy balance equation for coarse-grained soil is obtained. To reasonably measure the energy consumption of particle breakage, a function of friction coefficient relating to the axial strain is proposed to replace the friction coefficient as a constant in the energy balance equation based on the evolution rule of particle breakage. Then, according to the energy balance equation of coarse-grained soil, the energy consumption of particle breakage is calculated, and the particle breakage energy increases with axial strain increasing, which satisfies the thermodynamic law. Based on this energy balance equation, a simple stress dilatancy relationship is developed. In this stress dilatancy relationship, the relationship between dE b ∕pd s and M∕ √ M f can be described by a simple function with acceptable accuracy. This stress dilatancy relationship is validated with the satisfactory capability to predict the dilatancy behavior of coarse-grained soils, which can be the effective choice to build the constitutive model.

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Grain breakage under uniaxial compression using a three-dimensional discrete element method

Cited by 13 publications

References 29 publications

Revealing Correlations Between Size Polydispersity and Deformability of Idealized Granular Materials using DEM

Revealing Correlations Between Size Polydispersity and Deformability of Idealized Granular Materials using DEM

Oedometric compression of a granular material: computation of energies involved during breakage with a discrete element modelling

A stress dilatancy relationship for coarse-grained soils incorporating particle breakage

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