Emilien Azéma
University of Montpellier
ParticleAtomic packing factorPhysicsComposite materialCauchy stress tensorDiscrete element methodParticle sizeShear strengthMaterials scienceRheologyGeometryContact dynamicsGranular materialQuasistatic processMechanicsParticle-size distributionClassical mechanicsAnisotropyMicrostructureScaling
118Publications
21H-index
1,504Citations
Publications 105
Newest
#1Paul Sánchez (Colorado Center for Astrodynamics Research)H-Index: 16
#2Mathieu Renouf (University of Montpellier)H-Index: 14
Last. Frédéric Dubois (University of Montpellier)H-Index: 35
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Abstract Over the last decades, simulations by discrete elements methods (DEM) have proven to be a reliable analysis tool in various domains of science and engineering. By providing access to the local physical mechanisms, DEM allows the exploration of microscopic based phenomena related to particles properties and interactions in various conditions and to revisit constitutive equations consequently. The growing computer power and memory now allow us to handle large collections of grains of vari...
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#2Emilien Azéma (Institut Universitaire de France)H-Index: 21
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#1Paul Sánchez (Colorado Center for Astrodynamics Research)H-Index: 16
#3Emilien Azéma (Institut Universitaire de France)H-Index: 21
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We analyze the isotropic compaction of assemblies composed of soft pentagons interacting through classical Coulomb friction via numerical simulations. The effect of the initial particle shape is discussed by comparing packings of pentagons with packings of soft circular particles. We characterize the evolution of the packing fraction, the elastic modulus, and the microstructure (particle rearrangement, connectivity, contact force and particle stress distributions) as a function of the applied st...
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#1David Cantor (École Polytechnique de Montréal)H-Index: 2
#2Manuel Cárdenas-Barrantes (University of Montpellier)H-Index: 2
Last. Emilien AzémaH-Index: 21
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Using a numerical approach based on the coupling of the discrete and finite element methods, we explore the variation of the bulk modulus K of soft particle assemblies undergoing isotropic compression. As the assemblies densify under pressure-controlled boundary conditions, we show that the non-linearities of K rapidly deviate from predictions standing on a small-strain framework or the Equivalent Medium Theory (EMT). Using the granular stress tensor and extracting the bulk properties of single ...
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#1Jonathan BarésH-Index: 14
#2Manuel Cárdenas-Barrantes (University of Montpellier)H-Index: 2
Last. Mathieu RenoufH-Index: 14
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Granular systems are not always homogeneous and can be composed of grains with very different mechanical properties. To improve our understanding of the behavior of real granular systems, in this experimental study, we compress 2D bidisperse systems made of both soft and rigid grains. By means of a recently developed experimental set-up, \md{from the measurement of the displacement field we can} follow all the mechanical observables of this granular medium from the inside of each particle up-to-...
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We study the crushing strength of brittle materials whose internal structure (e.g., mineral particles or graining) presents a layered arrangement reminiscent of sedimentary and metamorphic rocks. Taking a discrete-element approach, we probe the failure strength of circular-shaped samples intended to reproduce specific mineral configurations. To do so, assemblies of cells, products of a modified Voronoi tessellation, are joined in mechanically-stable layerings using a bonding law. The cells' shap...
1 Citations
#1David Cantor (École Polytechnique de Montréal)H-Index: 2
Using a discrete-element approach and a bonding interaction law, we model and test crushable inherently anisotropic structures reminiscent of the layering found in sedimentary and metamorphic rocks. By systematically modifying the level of inherent anisotropy, we characterize the evolution of the failure strength of circular rock samples discretized using a modified Voronoi tesselation under diametral point loading at different orientations relative to the sample's layers. We characterize the fa...
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#2David Cantor (École Polytechnique de Montréal)H-Index: 2
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#1Manuel Cárdenas-Barrantes (University of Montpellier)
#2David Cantor (École Polytechnique de Montréal)H-Index: 2
Last. Emilien Azéma (University of Montpellier)H-Index: 21
view all 5 authors...
We analyze the isotropic compaction of mixtures composed of rigid and deformable incompressible particles by the non-smooth contact dynamics approach (NSCD). The deformable bodies are simulated using a hyper-elastic neo-Hookean constitutive law by means of classical finite elements. For mixtures that varied from totally rigid to totally deformable particles, we characterize the evolution of the packing fraction, the elastic modulus, and the connectivity as a function of the applied stresses when...
7 CitationsSource