A5067197622- Granular flow and fluidized beds
- Landslides and related hazards
- Material Dynamics and Properties
- Geotechnical and Geomechanical Engineering
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Sports Dynamics and Biomechanics
- Rheology and Fluid Dynamics Studies
- Adhesion, Friction, and Surface Interactions
- Rock Mechanics and Modeling
- Tree Root and Stability Studies
- Geotechnical Engineering and Soil Mechanics
- Theoretical and Computational Physics
- Bone Tissue Engineering Materials
- Pickering emulsions and particle stabilization
- Soil Mechanics and Vehicle Dynamics
- Tunneling and Rock Mechanics
- Planetary Science and Exploration
- Seismic Imaging and Inversion Techniques
- earthquake and tectonic studies
- Elasticity and Material Modeling
- High-pressure geophysics and materials
- High-Velocity Impact and Material Behavior
- Fluid Dynamics Simulations and Interactions
- Seismic Waves and Analysis
Laboratoire de Mécanique et Génie Civil
2016-2024
Université de Montpellier
2017-2024
Centre National de la Recherche Scientifique
2013-2024
Duke University
2016-2019
Laboratoire de génie civil et génie mécanique
2019
Nonlinear Control Strategies (United States)
2016-2017
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2012-2017
CEA Paris-Saclay
2013-2017
Université Paris-Saclay
2017
Physique et Mécanique des Milieux Hétérogènes
2016-2017
Using a discrete element method, we investigate the phenomenon of geometric cohesion in granular systems composed star-shaped particles with 3 to 13 arms. This was done by analyzing stability columns built these and studying microstructure terms density connectivity. We find that can exhibit (i.e., solidlike behavior, absence adhesive forces between grains), depending on shape friction them. is observed up given critical size system, from which transition metastable behavior takes place....
Shear-induced avalanches in two-dimensional granular materials are examined using computer simulations and an experimental system consisting of photoelastic discs. The authors study the global local properties these processes, compare their results with various models for such collective phenomena.
Here, we produced a synthetic polymer having adequate biocompatibility, biodegradability, and bioresorbability, as well mechanical properties for applications in bone tissue engineering. We used the fused deposition modeling (FDM) based 3D printing approach order to produce biomimetic biodegradable scaffolds made of polylactic acid (PLA). strengthened these by addition exfoliated boron nitride (EBN) filler. demonstrated presence EBN physicochemical analysis using Raman spectroscopy X-ray...
We study the jamming phase diagram of sheared granular material using a novel Couette shear setup with multiring bottom. The uses small basal friction forces to apply volume-conserving linear no band system composed frictional photoelastic discs. can generate arbitrarily large strain due its circular geometry, and direction be reversed, allowing us measure feature that distinguishes shear-jammed from fragile states. report systematic measurements stress, strain, contact network structure at...
Abstract Hydrogen Evolution Reaction (HER) is an attractive technology for chemical conversion of energy. Replacement platinum with inexpensive and stable electrocatalysts remains a major bottleneck hampering large-scale hydrogen production by using clean renewable energy sources. Here, we report electrocatalytically active ultra-stable Polymer-Derived Ceramics towards HER. We successfully prepared ultrathin silicon carbon (Si–C) based ceramic systems supported on electrically conducting 2D...
Abstract In this study, we explored the stability and compactness of columns formed from highly irregular particles. These particles, known as Platonic polypods, are fashioned by extruding arms onto faces solids, for which systematically varied number thickness these arms. We investigated emergence vanishing geometric cohesion (i.e., solid-like characteristics, in absence adhesive forces among particles). first built depositing particles within a cylindrical container, was then removed to...
The temporal evolution of mechanical energy and spatially averaged crack speed are both monitored in slowly fracturing artificial rocks. Both signals display an irregular burstlike dynamics, with power-law distributed fluctuations spanning a broad range scales. Yet, the elastic power released at each time step is proportional to global velocity all along process, which enables defining material-constant fracture energy. We characterize intermittent dynamics by computing burst statistics....
We study the local and global dynamics of sheared granular materials in a stick-slip experiment, using slider spring. The system crackles, with intermittent slip avalanches, or exhibits irregular periodic dynamics, depending on shear rate loading stiffness. force during shearing captures transitions from crackling to regime. deduce dynamic phase diagram as function stiffness associated scaling laws. Using photoelastic particles, we also capture grain-scale stress evolution, investigate...
Using the contact dymanics method together with finite element method, we simulate uniaxial compression of assemblies elastic cylinders. The numerical model accounts for deformations particles through neo-Hookean constitutive equation and solid friction between particles. A quantitative comparison experiments carried out centimetric rubberlike cylinders, local determined by image correlation, is proposed. We show that simulations accurately capture details both microstructure macroscopic...
We analyze the isotropic compaction of mixtures composed rigid and deformable incompressible particles by non-smooth contact dynamics approach (NSCD). The bodies are simulated using a hyper-elastic neo-Hookean constitutive law means classical finite elements. For that varied from totally to particles, we characterize evolution packing fraction, elastic modulus, connectivity as function applied stresses when varying inter-particle coefficient friction. show first fraction increases tends...
We study how the loading rate, specimen geometry, and microstructural texture select dynamics of a crack moving through an heterogeneous elastic material in quasistatic approximation. find transition, fully controlled by two dimensionless variables, between ruled continuum fracture mechanics crackling dynamics. Selection latter loading, microstructure, parameters is formulated terms scaling laws on power spectrum velocity. This analysis defines experimental conditions required to observe...
Above a certain density granular material jams. This property can be controlled by either tuning global property, such as the packing fraction or applying shear strain, at micro-scale grain shape, inter-particle friction externally organization. Here, we introduce novel way to change local adding weak anisotropic magnetic interaction between particles. We measure evolution of pressure, $P$, and coordination number, $Z$, for 2D photo-elastic disks, subject uniaxial compression. Some particles...
Abstract Brittle fractures of inhomogeneous materials like rocks, concrete, or ceramics are two types: Nominally brittle and driven by the propagation a single dominant crack quasi-brittle resulting from accumulation many microcracks. The latter goes along with acoustic noise, whose analysis has revealed that events form aftershock sequences obeying characteristic laws reminiscent those in seismology. Yet, their origin lacks explanation. Here we show such statistical organization is not only...
Dry granular packings of particles with complex shapes can form stiff, free-standing structures like walls or arches. This paper reports on experiments and simulations six-armed under shear, describes a configuration highly stressed within the packing that is responsible for providing rigidity.
In this work, we investigate the effect of particle shape, ranging from spherical to highly concave, on steady flows in a rotating drum, system that facilitates continuous transition jamming state at greater depths an unjamming shallower regions. We develop analytical model elucidate granular behavior within drum: (i) First, by decomposing shear stress, reconcile discrepancy between simulation data and theoretical predictions, establishing relationship with angle repose. (ii) Second, extend...
We present the experimental studies of highly strained soft bidisperse granular systems made hyperelastic and plastic particles. explore behavior matter deep in jammed state from local field measurement grain scale to global scale. By means a dedicated digital image correlation code an accurate recording method, we measure for each compression step evolution particle geometries their right Cauchy-Green strain tensor fields. analyze usual macroscopic observables (stress, packing fraction,...
We report on experiments investigating the dynamics of a slider that is pulled by spring across granular medium consisting vertical layer photoelastic disks. The motion proceeds through sequence discrete events, analogous to seismic shocks, in which elastic energy stored rapidly released. measure statistics several properties individual events: loss spring, duration movement, and temporal profile motion. also study certain conditional probabilities mainshock-aftershock sequences. At low...
This paper analyzes the compaction behavior of assemblies composed soft (elastic) spherical particles beyond jammed state, using three-dimensional non-smooth contact dynamic simulations. The are characterized evolution packing fraction, coordination number, and von Misses stress distribution within as confining increases. fraction increases tends toward a maximum value close to 1, mean number square root fraction. As increases, transition is observed from granular-like material with...
We analyze the isotropic compaction of assemblies composed soft pentagons interacting through classical Coulomb friction via numerical simulations. The effect initial particle shape is discussed by comparing packings with circular particles. characterize evolution packing fraction, elastic modulus, and microstructure (particle rearrangement, connectivity, contact force, stress distributions) as a function applied stresses. Both systems behave similarly: fraction increases tends...