Leonardo E. Silbert
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View article: Emergence of Intermediate Range Order in Jammed Packings
Emergence of Intermediate Range Order in Jammed Packings Open
We perform a structural analysis of large scale jammed packings of monodisperse, frictionless and frictional spheres to elucidate structural signatures of the static structure factor in the low-to-intermediate wave number region. We employ…
View article: Emergence of Intermediate Range Order in Jammed Packings
Emergence of Intermediate Range Order in Jammed Packings Open
We perform a structural analysis of large scale jammed packings of monodisperse, frictionless and frictional spheres to elucidate structural signatures of the static structure factor in the low-to-intermediate wavenumber ($q$) region. We e…
View article: Protocol-dependent frictional granular jamming simulations: cyclical, compression, and expansion
Protocol-dependent frictional granular jamming simulations: cyclical, compression, and expansion Open
Granular matter takes many paths to pack in natural and industrial processes. The path influences the packing microstructure, particularly for frictional grains. We perform discrete element modeling simulations of different paths to constr…
View article: Granular packing simulation protocols: tap, press and relax
Granular packing simulation protocols: tap, press and relax Open
Granular matter takes many paths to pack. Gentle compression, compaction or repetitive tapping can happen in natural and industrial processes. The path influences the packing microstructure, and thus macroscale properties, particularly for…
View article: Fractal dimensions of jammed packings with power-law particle size distributions in two and three dimensions
Fractal dimensions of jammed packings with power-law particle size distributions in two and three dimensions Open
Static structure factors are computed for large-scale, mechanically stable, jammed packings of frictionless spheres (three dimensions) and disks (two dimensions) with broad, power-law size dispersity characterized by the exponent -β. The s…
View article: Fractal dimensions of jammed packings with power-law particle size distributions in two and three dimensions
Fractal dimensions of jammed packings with power-law particle size distributions in two and three dimensions Open
Static structure factors are computed for large-scale, mechanically stable, jammed packings of frictionless spheres (three dimensions) and disks (two dimensions) with broad, power-law size dispersity characterized by the exponent $-β$. The…
View article: Large-scale frictionless jamming with power-law particle size distributions
Large-scale frictionless jamming with power-law particle size distributions Open
Due to significant computational expense, discrete element method simulations of jammed packings of size-dispersed spheres with size ratios greater than 1:10 have remained elusive, limiting the correspondence between simulations and real-w…
View article: Fluctuations and power-law scaling of dry, frictionless granular rheology near the hard-particle limit
Fluctuations and power-law scaling of dry, frictionless granular rheology near the hard-particle limit Open
Here the flow of frictionless granular particles is studied with stress-controlled discrete element modeling simulations for systems varying in size from 300 to 100,000 particles. The volume fraction and shear-stress ratio μ are relatively…
View article: Large-scale frictionless jamming with power-law particle size distributions
Large-scale frictionless jamming with power-law particle size distributions Open
Due to significant computational expense, discrete element method simulations of jammed packings of size-dispersed spheres with size ratios greater than 1:10 have remained elusive, limiting the correspondence between simulations and real-w…
View article: Fluctuations and power-law scaling of dry, frictionless granular rheology near the hard-particle limit
Fluctuations and power-law scaling of dry, frictionless granular rheology near the hard-particle limit Open
The flow of frictionless granular particles is studied with stress-controlled discrete element modeling simulations for systems varying in size from 300 to 100,000 particles. The volume fraction and shear stress ratio $\mu$ are relatively …
View article: Flow and arrest in stressed granular materials
Flow and arrest in stressed granular materials Open
Uniquely-defined steady states of flowing granular materials under applied shear stress and pressure: steady shear flow and shear arrest, which are bifurcated by friction-dependent critical ratio of shear stress and pressure.
View article: Jamming of bidisperse frictional spheres
Jamming of bidisperse frictional spheres Open
By generalizing a geometric argument for frictionless spheres, a model is\nproposed for the jamming density $\\phi_J$ of mechanically stable packings of\nbidisperse, frictional spheres. The monodisperse, $\\mu_s$-dependent jamming\ndensity…
View article: Structural and mechanical characteristics of sphere packings near the jamming transition: From fully amorphous to quasiordered structures
Structural and mechanical characteristics of sphere packings near the jamming transition: From fully amorphous to quasiordered structures Open
Mechanically stable sphere packings are generated in three-dimensional space using the discrete element method, which span a wide range in structural order, ranging from fully amorphous to quasi-ordered structures, as characterized by the …
View article: Granular packings with sliding, rolling, and twisting friction
Granular packings with sliding, rolling, and twisting friction Open
Intuition tells us that a rolling or spinning sphere will eventually stop due to the presence of friction and other dissipative interactions. The resistance to rolling and spinning or twisting torque that stops a sphere also changes the mi…
View article: Effect of surface morphology on kinetic compensation effect
Effect of surface morphology on kinetic compensation effect Open
As part of a systematic study on the kinetic compensation effect, we use kinetic Monte Carlo simulations to observe the effects of substrate topology on the transient variations in the Arrhenius parameters - effective activation energy $E_…
View article: Random walks on jammed networks: Spectral properties
Random walks on jammed networks: Spectral properties Open
Using random walk analyses we explore diffusive transport on networks obtained from contacts between isotropically compressed, monodisperse, frictionless sphere packings generated over a range of pressures in the vicinity of the jamming tr…
View article: Flow-Arrest Transitions in Frictional Granular Matter
Flow-Arrest Transitions in Frictional Granular Matter Open
The transition between shear-flowing and shear-arrested states of frictional granular matter is studied using constant-stress discrete element simulations. By subjecting a dilute system of frictional grains to a constant external shear str…
View article: Effect of shape and friction on the packing and flow of granular materials
Effect of shape and friction on the packing and flow of granular materials Open
Here, the packing and flow of aspherical frictional particles are studied using discrete element simulations. Particles are superballs with shape |x|s + |y|s + |z|s = 1 that varies from sphere (s = 2) to cube (s = ∞), constructed with an o…
View article: Breakdown of kinetic compensation effect in physical desorption
Breakdown of kinetic compensation effect in physical desorption Open
The kinetic compensation effect (KCE), observed in many fields of science, is the systematic variation in the apparent magnitudes of the Arrhenius parameters $E_a$, the energy of activation, and $\nu$, the preexponential factor, as a respo…
View article: Elastic moduli and vibrational modes in jammed particulate packings
Elastic moduli and vibrational modes in jammed particulate packings Open
When we elastically impose a homogeneous, affine deformation on amorphous solids, they also undergo an inhomogeneous, nonaffine deformation, which can have a crucial impact on the overall elastic response. To correctly understand the elast…
View article: Cutoff nonlinearities in the low-temperature vibrations of glasses and crystals
Cutoff nonlinearities in the low-temperature vibrations of glasses and crystals Open
We present a computer simulation study of glassy and crystalline states using the standard Lennard-Jones interaction potential that is truncated at a finite cutoff distance, as is typical of many computer simulations. We demonstrate that t…
View article: Spatial Distributions of Local Elastic Moduli Near the Jamming Transition
Spatial Distributions of Local Elastic Moduli Near the Jamming Transition Open
Recent progress on studies of the nanoscale mechanical responses in disordered systems has highlighted a strong degree of heterogeneity in the elastic moduli. In this contribution, using computer simulations, we study the elastic heterogen…
View article: Diffusion in Jammed Particle Packs
Diffusion in Jammed Particle Packs Open
Using random walk simulations we explore diffusive transport through monodisperse sphere packings over a range of packing fractions ϕ in the vicinity of the jamming transition at ϕ(c). Various diffusion properties are computed over several…