Modeling soft granular materials

Nezamabadi, Saeid; Nguyễn, Thanh Hải; Delenne, Jean‐Yves; Radjaï, Farhang

doi:10.1007/s10035-016-0689-y

Cited by 47 publications

(41 citation statements)

References 46 publications

(56 reference statements)

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“…Although, in these studies the global properties were quite appropriately estimated, the particle-scale parameters were not well predicted [7,8]. Recently some numerical works using methodologies combining features of the DEM with appropriate methods for the simulation of particle deformations were carried out [9][10][11][12].…”

Section: Numerical Simulations Of the Compaction Of Assemblies Of Rubmentioning

confidence: 99%

Numerical simulations of the compaction of assemblies of rubberlike particles: A quantitative comparison with experiments

Vu¹,

Barés²,

Mora³

et al. 2019

Phys. Rev. E

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Using the contact dymanics method together with the finite element method, we simulate the uniaxial compression of assemblies of elastic cylinders. The numerical model accounts for finite deformations of the particles through the neo-Hookean constitutive equation and solid friction between the particles. A quantitative comparison with experiments carried out with centimetric rubberlike cylinders, with local deformations of the particles determined by image correlation, is proposed. We show that the simulations accurately capture the details of both the microstructure and the macroscopic behavior of the real granular system, demonstrating the relevancy of the numerical approach.

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Section: Numerical Simulations Of the Compaction Of Assemblies Of Rubmentioning

confidence: 99%

Numerical simulations of the compaction of assemblies of rubberlike particles: A quantitative comparison with experiments

Vu¹,

Barés²,

Mora³

et al. 2019

Phys. Rev. E

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“…Applying the Gauss-Ostrogradsky theorem and making use of the condition (30), the volume integral in Equation (29) can be transformed to the integral over the particle boundary S p 52-54…”

Section: Evaluation Of Particle Stressesmentioning

confidence: 99%

The discrete element method with deformable particles

Rojek

Zubelewicz

Madan

et al. 2018

Numerical Meth Engineering

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Summary This work presents a new original formulation of the discrete element method (DEM) with deformable cylindrical particles. Uniform stress and strain fields are assumed to be induced in the particles under the action of contact forces. Particle deformation obtained by strain integration is taken into account in the evaluation of interparticle contact forces. The deformability of a particle yields a nonlocal contact model, it leads to the formation of new contacts, it changes the distribution of contact forces in the particle assembly, and it affects the macroscopic response of the particulate material. A numerical algorithm for the deformable DEM (DDEM) has been developed and implemented in the DEM program DEMPack. The new formulation implies only small modifications of the standard DEM algorithm. The DDEM algorithm has been verified on simple examples of an unconfined uniaxial compression of a rectangular specimen discretized with regularly spaced equal bonded particles and a square specimen represented with an irregular configuration of nonuniform‐sized bonded particles. The numerical results have been verified by a comparison with equivalent finite element method results and available analytical solutions. The micro‐macro relationships for elastic parameters have been obtained. The results have proved to have enhanced the modeling capabilities of the DDEM with respect to the standard DEM.

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“…Note also that, alternative modelling approaches (e.g. the Material Point Method [26] or a recent DEM-based modelling [27] that, unlike classical DEM, take into account grains' deformability) are promising. Consequently, in a near future, we can expect to see more realistic grain-scale simulations of such sand-rubber particulate composites.…”

Section: Introductionmentioning

confidence: 99%

Sand–rubber mixtures undergoing isotropic loading: derivation and experimental probing of a physical model

Platzer

Rouhanifar

Richard³

et al. 2018

Granular Matter

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The volume of scrap tyres, an undesired urban waste, is increasing rapidly in every country. Mixing sand and rubber particles as a lightweight backfill is one of the possible alternatives to avoid stockpiling them in the environment. This paper presents a minimal model aiming to shed light on the relevant physical parameters governing the evolution of the void ratio of sandrubber mixtures undergoing an isotropic compression loading, where the mixtures consist of various volume ratios of rubber. It is based on the idea that, when pressure is applied, the rubber particles deform and partially fill the porous space of the system, leading to a decrease of the void ratio with increasing pressure. We show that our simple approach is capable of reproducing experimental data obtained with sand and rubber of similar particle size distributions up to mixtures composed of 50% of rubber. The effect of the particle shape and size on the model parameters is discussed.

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Modeling soft granular materials

Cited by 47 publications

References 46 publications

Numerical simulations of the compaction of assemblies of rubberlike particles: A quantitative comparison with experiments

Numerical simulations of the compaction of assemblies of rubberlike particles: A quantitative comparison with experiments

The discrete element method with deformable particles

Sand–rubber mixtures undergoing isotropic loading: derivation and experimental probing of a physical model

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