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Jean-François Molinari

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Related publications (144)

Page 6 of 8

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

Jean-François Molinari, Philippe Gillet, David Simon Kammer, 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

The role of the roughness spectral breadth in elastic contact of rough surfaces (vol 107, pg 469, 2017)

Jean-François Molinari, Guillaume Anciaux, Vladislav Yastrebov

PERGAMON-ELSEVIER SCIENCE LTD2022

The role of viscoelasticity on heterogeneous stress fields at frictional interfaces

Jean-François Molinari, David Simon Kammer, 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

A Simple Mechanistic Model for Friction of Rough Partially Lubricated Surfaces

Jean-François Molinari, Tobias Brink, Gianluca Costagliola

We report experimental measurements of friction between an aluminum alloy sliding over steel with various lubricant densities. Using the topography scans of the surfaces as input, we calculate the real contact area using the boundary element method and the ...

2021

Roughness Evolution Induced by Third-Body Wear (vol 72, 37, 2024) [Correction]

Jean-François Molinari, Tobias Brink

2024

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

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

Jean-François Molinari, Guillaume Anciaux, Till Junge, 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

Velocity-driven frictional sliding: Coarsening and steady-state pulses

Jean-François Molinari, Thibault Didier Roch

Frictional sliding is an intrinsically complex phenomenon, emerging from the interplay between driving forces, elasto-frictional instabilities, interfacial nonlinearity and dissipation, material inertia and bulk geometry. We show that homogeneous rate-and- ...

2022

Numerical simulations of nanotribology

Jean-François Molinari, Guillaume Anciaux, Pedro Romero

We present a 3D multiscale coupling method to address sliding contact simulations at the nanoscale. The components of the model are a molecular dynamics engine, a finite element program and a coupling scheme. We consider the normal loading of a rough (frac ...

2009

Interplay between Process Zone and Material Heterogeneities for Dynamic Cracks

Jean-François Molinari, Fabian Barras

Using an elastodynamic boundary integral formulation coupled with a cohesive model, we study the problem of a dynamic rupture front propagating along an heterogeneous plane. We show that small-scale heterogeneities facilitate the supershear transition of a ...

American Physical Society2017

A study of frictional contact in dynamic fracture along bimaterial interfaces

Jean-François Molinari, Fabian Barras, David Simon Kammer

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

3D dynamic fragmentation with parallel dynamic insertion of cohesive elements

Jean-François Molinari, Nicolas Richart, Marco Vocialta

Dynamic fragmentation is a rapid and catastrophic failure of a material. During this process, the nucleation, propagation, branching, and coalescence of cracks results in the formation of fragments. The numerical modeling of this phenomenon is challenging ...

Wiley2017

HPC simulations of alkali-silica reaction-induced damage: Influence of alkali-silica gel properties

Jean-François Molinari, Mauro Corrado, Aurelia Isabel Cuba Ramos

Pergamon-Elsevier Science Ltd2018

Unstable Slip Pulses and Earthquake Nucleation as a Nonequilibrium First-Order Phase Transition

Jean-François Molinari, Fabian Barras

The onset of rapid slip along initially quiescent frictional interfaces, the process of “earthquake nucleation,” and dissipative spatiotemporal slippage dynamics play important roles in a broad range of physical systems. Here we first show that interfaces ...

2018

How the obscuration-zone hypothesis affects fragmentation: Illustration with the cohesive-element method

Jean-François Molinari, Sarah Levy

The problem of fragmentation prediction is at the origin of various analytical models. Among them, we focus on the ones introducing the idea of obscured zones. They assume that when a crack initiates at a defect, a stress release wave propagates away from ...

Springer Netherlands2011

Numerical analysis of the effects of residual stresses in concrete

Jean-François Molinari, Mauro Corrado

2015

Finite element simulations of kidney stones fragmentation by direct impact: Tool geometry and multiple impacts

Jean-François Molinari

This paper analyses the fragmentation of kidney stones by direct impact with Swiss Lithoclast Master(R). Based on a previous work, the impact of the probe of the Lithoclast is modeled with a displacement control of the nodes inside the impacted area. Diffe ...

Elsevier2010

Effect of wear particles and roughness on nanoscale friction

Jean-François Molinari, Tobias Brink, Enrico Milanese

Frictional contacts lead to the formation of a surface layer called the third body, consisting of wear particles and structures resulting from their agglomerates. Its behavior and properties at the nanoscale control the macroscopic tribological performance ...

2022

The autocorrelation function for island areas on self-affine surfaces

Jean-François Molinari, Guillaume Anciaux, Srinivasa Babu Ramisetti

The spatial distribution of regions that lie above contours of constant height through a self-affine surface is studied as a function of the Hurst exponent H. If the surface represents a landscape, these regions correspond to islands. When the surface repr ...

2011

Contact mechanics at the nanoscale, a 3D multiscale approach

Jean-François Molinari, Guillaume Anciaux

We present a multiscale coupling method to address contact problems. The components of the model are a molecular dynamics engine, a finite element program and a coupling scheme. We validate the approach, first on Hertzian contact and then with a rough surf ...

Wiley2009