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Jean-François Molinari

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Publications associées (145)

Avalanches in dry and saturated disordered media at fracture in shear and mixed mode scenarios

Jean-François Molinari, Okan Yilmaz, Enrico Milanese

We investigate shear and mixed mode fracture scenarios in inhomogeneous dry and fully saturated porous media with a 2D central force lattice model. For the fully saturated case we adopt the extended Biot's theory. The bars of the lattice break only under t ...

Elsevier2017

A mesoscale fracture model for concrete

Jean-François Molinari, Okan Yilmaz

We analyze the dynamic failure of concrete using two and three-dimensional finite-element models. In particular, the current results extend, using a unique parallel computing approach, previously published two-dimensional results. Concrete is treated at th ...

Pergamon-Elsevier Science Ltd2017

On the debris-level origins of adhesive wear

Jean-François Molinari, Ramin Aghababaei, Derek Warner

Every contacting surface inevitably experiences wear. Predicting the exact amount of material loss due to wear relies on empirical data and cannot be obtained from any physical model. Here, we analyze and quantify wear at the most fundamental level, i.e., ...

Natl Acad Sciences2017

Mobility law of dislocations with several character angles and temperatures in FCC Aluminum

Jean-François Molinari, Guillaume Anciaux, Jaehyun Cho

We study the mobility law of dislocations in aluminum as an important building block for the development of a multiscale method that couples an atomistic model with discrete dislocation dynamics in 3d (\eg CADD3d). Straight dislocations of arbitrary charac ...

Elsevier2017

Damage cluster distributions in numerical concrete at the mesoscale

Jean-François Molinari, Okan Yilmaz

We investigate the size distribution of damage clusters in concrete under uniaxial tension loading conditions. Using the finite-element method, the concrete is modeled at the mesoscale by a random distribution of elastic spherical aggregates within an elas ...

Amer Physical Soc2017

Properties of the shear stress peak radiated ahead of rapidly accelerating rupture fronts that mediate frictional slip

David Simon Kammer, Jean-François Molinari, Mathilde Edmée Lucette Radiguet de la Bastaie, Daniel Pino Muñoz

We study rapidly accelerating rupture fronts at the onset of frictional motion by performing high-temporal-resolution measurements of both the real contact area and the strain fields surrounding the propagating rupture tip. We observe large-amplitude and l ...

National Academy of Sciences2016

Critical length scale controls adhesive wear mechanisms

Jean-François Molinari, Ramin Aghababaei, Derek Warner

The adhesive wear process remains one of the least understood areas of mechanics. While it has long been established that adhesive wear is a direct result of contacting surface asperities, an agreed upon understanding of how contacting asperities lead to w ...

Springer2016

Length Scale of interface heterogeneities selects propagation mechanism of frictional slip fronts

David Simon Kammer, Jean-François Molinari, Daniel Pino Muñoz

We present three-dimensional finite-element simulations showing the propagation of slip fronts at striped heterogeneous interfaces. The heterogeneous area consists of alternating stripes of weaker and stronger frictional properties, which is equivalent to ...

Elsevier2016

Avalanches in dry and saturated disordered media at fracture

Jean-François Molinari, Okan Yilmaz, Enrico Milanese

This paper analyzes fracturing in inhomogeneous media under dry and fully saturated conditions. We adopt a central force model with continuous damage to study avalanche behavior in a two-dimensional truss lattice undergoing dilation. Multiple fractures can ...

Amer Physical Soc2016

Effects of residual stresses on the tensile fatigue behavior of concrete

Jean-François Molinari, Mauro Corrado

The influence of Eigenstresses due to drying shrinkage on the development of residual deformations characterizing the tensile fatigue behavior of concrete is analyzed. During the loading phase the Eigenstresses are locally released around the cracks induci ...

Pergamon-Elsevier Science Ltd2016

Toward a 3D coupled atomistic and discrete dislocation dynamics simulation: dislocation core structures and Peierls stresses with several character angles in FCC aluminum

Till Junge, Jean-François Molinari, Guillaume Anciaux, Jaehyun Cho

We present a robust method to obtain the displacement field of a dislocation core, which is one of the building blocks for the development of a direct multiscale method coupling an atomistic domain to a discrete dislocation dynamics engine in 3D (e.g. CADD ...

2015

From infinitesimal to full contact between rough surfaces: Evolution of the contact area

Jean-François Molinari, Guillaume Anciaux, Vladislav Yastrebov

We carry out a statistically meaningful study on self-affine rough surfaces in elastic frictionless non-adhesive contact. We study the evolution of the true contact area under increasing squeezing pressure from zero up to full contact, which enables us to ...

Pergamon-Elsevier Science Ltd2015

Implementation of a parallel finite-element library: test case on a non-local continuum damage model

Jean-François Molinari, Nicolas Richart

This paper presents an efficient method to implement a damage law within an explicit time-integration scheme, in an open-source object-oriented finite-element framework. The hybrid object/vector design of the framework and implementation choices are detail ...

Elsevier Science Bv2015

Influence of internal impacts between fragments in dynamic brittle tensile fragmentation

Jean-François Molinari, Marco Vocialta

Dynamic fragmentation phenomena involve two important mechanisms: atomic debonding and internal impacts among formed fragments. While the former, i.e. energy dissipation due to crack propagation, has been frequently studied both theoretically and numerical ...

Elsevier2015

Dynamic stability of displacement-based atomistic/continuum coupling methods

Till Junge, Jean-François Molinari, Guillaume Anciaux

We show that concurrent atomistic/continuum displacement-coupling methods are inherently unstable in the context of fully dynamic problems at finite temperature. The fundamental origin of the instability is the displacement coupling of two material descrip ...

Elsevier2015

Linear Elastic Fracture Mechanics Predicts the Propagation Distance of Frictional Slip

David Simon Kammer, Jean-François Molinari, Mathilde Edmée Lucette Radiguet de la Bastaie

When a frictional interface is subject to a localized shear load, it is often (experimentally) observed that local slip events propagate until they arrest naturally before reaching the edge of the interface. We develop a theoretical model based on linear e ...

Springer/Plenum Publishers2015

A new formulation for imposing Dirichlet boundary conditions on non-matching meshes

Jean-François Molinari, Alejandro Marcos Aragon, Aurelia Isabel Cuba Ramos

Generating matching meshes for problems with complex boundaries is often an intricate process, and the use of non-matching meshes appears as an appealing solution. Yet, enforcing boundary conditions on non-matching meshes is not a straightforward process, ...

Wiley-Blackwell2015

Seismic safety evaluation of an arch dam with Akantu FE code developed at EPFL

Jean-François Molinari, Guillaume Anciaux, Sacha Roger Laffely, Damien Scantamburlo, Mauro Corrado

2015

Dynamic crack propagation in a heterogeneous ceramic microstructure, insights from a cohesive model

Jean-François Molinari, Nicolas Richart, Seyedeh Mohadeseh Taheri Mousavi, Cyprien Wolff

A 2D plane-strain dynamically propagating crack under tensile loading is simulated with cohesive elements. Information of the main crack is extracted from a diffuse crack network with the use of graph properties. Micro-transgranular fracture properties are ...

Elsevier2015

The role of viscoelasticity on heterogeneous stress fields at frictional interfaces

David Simon Kammer, Jean-François Molinari, Mathilde Edmée Lucette Radiguet de la Bastaie

We investigate the evolution of heterogeneous stress states along frictional in- terfaces. Using finite-element simulations, we model the occurrence of precur- sory slip sequences on a deformable-deformable as well as a deformable-rigid interface between t ...

Elsevier2015

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