Recherche

Afficher tous les résultats pour

Accueil

Personne

Jean-François Molinari

À propos
Confidentialité
Mentions légales

Graph Chatbot

Publications associées (145)

Numerical analysis of the effects of residual stresses in concrete

Jean-François Molinari, Mauro Corrado

2015

A non-local continuum damage approach to model dynamic crack branching

Jean-François Molinari, Nicolas Richart, Cyprien Wolff

Dynamic crack branching instabilities in a brittle material are studied numerically by using a non-local damage model. PMMA is taken as our model brittle material. The simulated crack patterns, crack velocities and dissipated energies, compare favorably to ...

Wiley2015

On the influence of transgranular and intergranular failure mechanisms during dynamic loading of silicon nitride

Jean-François Molinari, Seyedeh Mohadeseh Taheri Mousavi

Plane-strain tensile loading numerical simulations of dynamic crack propagation in silicon nitride microstructures are conducted. The strength and toughness are evaluated as a function of strain rate and microstructural parameters, including grain size and ...

Elsevier2014

The Contact of Elastic Regular Wavy Surfaces Revisited

Jean-François Molinari, Guillaume Anciaux, Vladislav Yastrebov

We revisit the classic problem of an elastic solid with a two-dimensional wavy surface squeezed against an elastic flat half-space from infinitesimal to full contact. Through extensive numerical calculations and analytic derivations, we discover previously ...

Springer/Plenum Publishers2014

A hierarchical detection framework for computational contact mechanics

Jean-François Molinari, Alejandro Marcos Aragon

A novel methodology consisting of three hierarchical levels is proposed for the detection phase of contact mechanics simulations. The top level of the hierarchy uses kinematic information from the objects involved in the simulation to determine approximate ...

Elsevier2014

A study of frictional contact in dynamic fracture along bimaterial interfaces

David Simon Kammer, Jean-François Molinari, Fabian Barras

We investigate numerically the dynamic inplane propagation of a centered crack along bimaterial interfaces using a spectral formulation of the elastodynamic boundary integral equations. Particular attention is given to the effect of contact zones at the su ...

Springer Verlag2014

A concurrent atomistic and continuum coupling method with applications to thermo-mechanical problems

Jean-François Molinari, Guillaume Anciaux, Srinivasa Babu Ramisetti

We present a novel method to couple molecular dynamics with finite elements at finite temperatures using spatial filters. The mismatch in the dispersion relations between continuum and atomistic models leads, at finite temperature, to unwanted mesh vibrati ...

Wiley-Blackwell2014

Plastic activity in nanoscratch molecular dynamics simulations of pure aluminium

Till Junge, Jean-François Molinari

Atomistic models for friction suffer from the severe length- and time-scale restrictions of molecular dynamics. In this paper, a novel approach to quantify the scratching work and the energy associated with plastic activity is used. The approach is combine ...

Pergamon-Elsevier Science Ltd2014

Impact of internal crystalline boundaries on lattice thermal conductivity: Importance of boundary structure and spacing

Jean-François Molinari, Guillaume Anciaux, Ramin Aghababaei

The low thermal conductivity of nano-crystalline materials is commonly explained via diffusive scattering of phonons by internal boundaries. In this study, we have quantitatively studied phononcrystalline boundaries scattering and its effect on the overall ...

AIP American Institute of Physics2014

The existence of a critical length scale in regularised friction

David Simon Kammer, Jean-François Molinari, Guillaume Anciaux, Vladislav Yastrebov

We study a regularisation of Coulomb's friction law on the propagation of local slip at an interface between a deformable and a rigid solid. This regularisation, which was proposed based on experimental observations, smooths the effect of a sudden jump in ...

Elsevier2014

A cohesive element model for mixed mode loading with frictional contact capability

Jean-François Molinari, Leonardo Snozzi

We present a model that combines interface debonding and frictional contact. The onset of fracture is explicitly modeled using the well-known cohesive approach. Whereas the debonding process is controlled by a new extrinsic traction separation law, which a ...

Wiley-Blackwell2013

Relations between roughness, temperature and dry sliding friction at the atomic scale

Jean-François Molinari, Guillaume Anciaux, Peter Spijker

We investigate the friction of deformable bodies, with nano-scale self-affine fractal rough surfaces, at the atomic scale using molecular dynamics. Different temperatures (0-400 K) are studied, while roughness and applied load are changed. During sliding, ...

Elsevier Sci Ltd2013

Numerical determination of the tensile response and the dissipated fracture energy of concrete: role of the meso-structure and inﬂuence of the loading rate

Jean-François Molinari, Leonardo Snozzi, Fabrice Gatuingt

At the mesoscopic scale, concrete can be considered as a mix of coarse aggregates with a mortar paste matrix. In this paper, we investigate numerically the influence of aggregates arrangements and loading rate on the tensile response of concrete. Each coar ...

Wiley-Blackwell2013

Direct Visualization of Single Ions in the Stern Layer of Calcite

Jean-François Molinari, Peter Spijker, Francesco Stellacci, Kislon Voitchovsky, Maria Ricci

Calcite is among the most abundant minerals on earth and plays a central role in many environmental and geochemical processes. Here we used amplitude modulation atomic force microscopy (AFM) operated in a particular regime to visualize single ions close to ...

American Chemical Society2013

Insights into the thermo-mechanics of orthogonal nanometric machining

Jean-François Molinari, Guillaume Anciaux, Pedro Romero

The fabrication of high precision miniaturized components in micro- and nano-technologies requires a deep understanding of the physical mechanisms governing the nanomachining process. To aid with this need, the current article employs molecular dynamics to ...

Elsevier2013

Survival of Heterogeneous Stress Distributions Created by Precursory Slip at Frictional Interfaces

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

We study the dynamics of successive slip events at a frictional interface with finite-element simulations. Because of the viscous properties of the material, the stress concentrations created by the arrest of precursory slip are not erased by the propagati ...

American Physical Society2013

A constrained-optimization methodology for the detection phase in contact mechanics simulations

Jean-François Molinari, Vladislav Yastrebov, Alejandro Marcos Aragon

The detection phase in computational contact mechanics can be subdivided into a global search and a local detection. When potential contact is detected by the former, a rigorous local detection determines which surface elements come or may come in contact ...

Wiley2013

Spatial filters for bridging molecular dynamics with finite elements at finite temperatures

Jean-François Molinari, Guillaume Anciaux, Srinivasa Babu Ramisetti

We present the application of digital filters to split the energy spectrum of an atomistic zone simulated with molecular dynamics into low and high energy components. After a brief background on digital filters, we describe the procedure used to select a c ...

Elsevier2013

On the Propagation of Slip Fronts at Frictional Interfaces

David Simon Kammer, Jean-François Molinari, Peter Spijker, Vladislav Yastrebov

The dynamic initiation of sliding at planar interfaces between deformable and rigid solids is studied with particular focus on the speed of the slip front. Recent experimental results showed a close relation between this speed and the local ratio of shear ...

Springer US2012

A meso-mechanical model for concrete under dynamic tensile and compressive loading

Jean-François Molinari, Leonardo Snozzi, Fabrice Gatuingt

We present a computational model, which combines interface debonding and frictional contact, in order to investigate the response of concrete specimens subjected to dynamic tensile and compressive loading. Concrete is modeled using a meso-mechanical approa ...

Springer Verlag2012

Page 6 sur 8