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Thermally activated flow in models of amorphous solids

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Breakdown of continuum elasticity in amorphous solids

Matthieu Wyart, Eric DeGiuli

We show numerically that the response of simple amorphous solids (elastic networks and particle packings) to a local force dipole is characterized by a lengthscale c that diverges as unjamming is approached as c ∼ (z - 2d)-1/2, where z ≥ 2d is the mean coo ...

Royal Society of Chemistry2014

Oscillatory deformation of amorphous materials

Davide Fiocco

In this thesis we describe the results of simulations at the atomic level of a simple model of a metallic glass under cyclic shear deformation. We show that under oscillatory cyclic load, systems of Lennard-Jones particles exhibit a non-equilibrium transit ...

EPFL2014

In situ Neutron Diffraction during Casting: Determination of Rigidity Point in Grain Refined Al-Cu Alloys

Jean-Marie Drezet, Bastien Gilbert Pierre Mireux

The rigidity temperature of a solidifying alloy is the temperature at which the solid plus liquid phases are sufficiently coalesced to transmit long range tensile strains and stresses. It determines the point at which thermally induced deformations start t ...

Mdpi Ag2014

Design of a bed load and driftwood filtering dam, analysis of the phenomena and hydraulic design

Giovanni De Cesare

Flood protection often calls on to the realization of retention works for bed load as well as wood and debris flow. Certain relatively recent arrangements did not perform according to their intended function, what shows the complexity of the design and the ...

CRC Press/Balkema2014

Superfluid-insulator transition of two-dimensional disordered Bose gases

Vincenzo Savona, Pierre Lugan, Joseph Saliba

We study the two-dimensional weakly repulsive Bose gas at zero temperature in the presence of correlated disorder. Using large-scale simulations, we show that the low-energy Bogoliubov cumulative density of states remains quadratic up to a critical disorde ...

American Physical Society2014

Oscillatory athermal quasistatic deformation of a model glass

Giuseppe Foffi, Davide Fiocco

We report computer simulations of oscillatory athermal quasistatic shear deformation of dense amorphous samples of a three-dimensional model glass former. A dynamical transition is observed as the amplitude of the deformation is varied: For large values of ...

Amer Physical Soc2013

A unified framework for non-Brownian suspension flows and soft amorphous solids

Matthieu Wyart

While the rheology of non-Brownian suspensions in the dilute regime is well understood, their behavior in the dense limit remains mystifying. As the packing fraction of particles increases, particle motion becomes more collective, leading to a growing leng ...

2012

Arrested demixing opens route to bigels

Nicolas Dorsaz, Francesco Varrato, Giuseppe Foffi, Maxim Belushkin

Understanding and, ultimately, controlling the properties of amorphous materials is one of the key goals of material science. Among the different amorphous structures, a very important role is played by colloidal gels. It has been only recently understood ...

Natl Acad Sciences2012

Using the approximate conformal invariance of QCD at high energies we consider a simple AdS black disk model to describe saturation in DIS. Deep inside saturation the structure functions have the same power law scaling, F(T) similar to F(L) similar to x(-o ...

Amer Inst Physics2011

Study of Nanometric Machining in Crystalline Solids Using Molecular Dynamics

Jean-François Molinari, Guillaume Anciaux, Pedro Romero

Due to the current interest in nanotechnology, there is a strong desire for comprehensive knowledge on the underlying mechanisms governing the nanometric machining process. This article employs molecular dynamics to study nanomachining in ductile crystalli ...

2010