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Jean-François Molinari

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Publications associées (145)

Crack Nucleation in the Adhesive Wear of an Elastic-Plastic Half-Space

Jean-François Molinari, Guillaume Anciaux, Lucas Henri Galilée Frérot

The detachment of material in an adhesive wear process is driven by a fracture mechanism which is controlled by a critical length-scale. Previous efforts in multi-asperity wear modeling have applied this microscopic process to rough elastic contact. Howeve ...

PERGAMON-ELSEVIER SCIENCE LTD2020

Adhesive wear and interaction of tangentially loaded micro-contacts

Jean-François Molinari, Son-Jonathan Pham-Ba, Tobias Brink

Current engineering wear models are often based on empirical parameters rather than built upon physical considerations. Here, we look for a physical description of adhesive wear at the microscale, at which the interaction between two surfaces comes down to ...

2020

The emergence of crack-like behavior of frictional rupture: Edge singularity and energy balance

Jean-François Molinari, Fabian Barras, Thibault Didier Roch

The failure of frictional interfaces - the process of frictional rupture - is widely assumed to feature crack-like properties, with far-reaching implications for various disciplines, ranging from engineering tribology to earthquake physics. An important co ...

ELSEVIER2020

Crack front waves: A 3D dynamic response to a local perturbation of tensile and shear cracks

Jean-François Molinari, Fabian Barras, Damien Spielmann, Fatima-Ezzahra Fekak

Crack front waves are long-lived perturbations propagating along the crack front. They are triggered by heterogeneities on the crack plane, as for instance tough asperities, which disturb the crack front shape. Crack front waves are thought to leave a trac ...

PERGAMON-ELSEVIER SCIENCE LTD2020

Finite element modeling of dynamic frictional rupture with rate and state friction

Jean-François Molinari, Fabian Barras, Roozbeh Rezakhani, Michael Ludovic Brun

Numerous laboratory experiments have demonstrated the dependence of the friction coefficient on the interfacial slip rate and the contact history, a behavior generically called rate and state friction. Although numerical models have been widely used for an ...

PERGAMON-ELSEVIER SCIENCE LTD2020

Meso-scale modelling of ASR in concrete: effect of viscoelasticity

Jean-François Molinari, Mauro Corrado, Roozbeh Rezakhani, Emil Gallyamov

A meso-scale numerical model for simulating damage in concrete due to ASR is presented. It accounts for the internal structure of concrete including aggregates and mortar. ASR sites are explicitly represented. This model is extended to account for viscoela ...

2020

Variational phase-field continuum model uncovers adhesive wear mechanisms in asperity junctions

Jean-François Molinari, Sylvain Collet

Wear is well known for causing material loss in a sliding interface. Available macroscopic approaches are bound to empirical fitting parameters, which range several orders of magnitude. Major advances in tribology have recently been achieved via Molecular ...

2020

Multi-scale modelling of concrete structures affected by alkali-silica reaction: Coupling the mesoscopic damage evolution and the macroscopic concrete deterioration

Jean-François Molinari, Aurelia Isabel Cuba Ramos, Mauro Corrado, Roozbeh Rezakhani, Emil Gallyamov

A finite-element approach based on the first-order FE2 homogenisation technique is formulated to analyse the alkali-silica reaction-induced damage in concrete structures, by linking the concrete degradation at the macro-scale to the reaction extent at the ...

PERGAMON-ELSEVIER SCIENCE LTD2020

Explicit dynamic approach for unbounded domains in frictional contact with Rate and State laws

Jean-François Molinari, Roozbeh Rezakhani

The paper explores the ability of an explicit time integration procedure to simulate the dynamics of shear rupture between unbounded elastic blocks on frictional interface, modeled with the finite element method. The behaviour of the interface is governed ...

ELSEVIER2020

A mechanistic model for the growth of cylindrical debris particles in the presence of adhesion

Jean-François Molinari, Enrico Milanese

The wear volume is known to keep increasing during frictional processes, and Archard notably proposed a model to describe the probability of wear particle formation upon asperity collision in a two-body contact configuration. While this model is largely ad ...

PERGAMON-ELSEVIER SCIENCE LTD2020

Role of interfacial adhesion on minimum wear particle size and roughness evolution

Jean-François Molinari, Ramin Aghababaei, Enrico Milanese, Tobias Brink

Adhesion between two bodies is a key parameter in wear processes. At the macroscale, strong adhesive bonds are known to lead to high wear rates, as observed in clean metal-on-metal contact. Reducing the strength of the interfacial adhesion is then desirabl ...

2020

Tamaas: a library for elastic-plastic contact of periodic rough surfaces

Jean-François Molinari, Guillaume Anciaux, Lucas Henri Galilée Frérot, Son-Jonathan Pham-Ba, Valentine Ginette Madeleine Rey

Tamaas: a library for elastic-plastic contact of periodic rough surfaces", published in the Journal of Open Source Softwares describes the free and open-source library Tamaas. More than five years in the making, Tamaas is a high performance C++/Python libr ...

2020

Emergence of Cracklike Behavior of Frictional Rupture: The Origin of Stress Drops

Jean-François Molinari, Fabian Barras, Thibault Didier Roch

The process of frictional rupture, i.e., the failure of frictional systems, abounds in the technological and natural world around us, ranging from squealing car brake pads to earthquakes along geological faults. A general framework for understanding and in ...

American Physical Society2019

Adhesive wear mechanisms in the presence of weak interfaces: Insights from an amorphous model system

Jean-François Molinari, Tobias Brink

Engineering wear models are generally empirical and lack connections to the physical processes of debris generation at the nanoscale to microscale. Here, we thus analyze wear particle formation for sliding interfaces in dry contact with full and reduced ad ...

2019

A Fourier-accelerated volume integral method for elastoplastic contact

Jean-François Molinari, Guillaume Anciaux, Lucas Henri Galilée Frérot

The contact of solids with rough surfaces plays a fundamental role in physical phenomena such as friction, wear, sealing, and thermal transfer. However, its simulation is a challenging problem due to surface asperities covering a wide range of length-scale ...

2019

Contact élastoplastique : équations intégrales accélérées par une approche Fourier

Jean-François Molinari, Guillaume Anciaux, Lucas Henri Galilée Frérot

Une approche par équations intégrales volumiques du problème de contact élastoplastique périodique est présentée. Elle repose sur la formulation des fonctions de Green nécessaires au calcul des opérateurs intégraux directement dans l’espace de Fourier. Cel ...

2019

Emergence of self-affine surfaces during adhesive wear

Jean-François Molinari, Ramin Aghababaei, Enrico Milanese, Tobias Brink

Friction and wear depend critically on surface roughness and its evolution with time. An accurate control of roughness is essential to the performance and durability of virtually all engineering applications. At geological scales, roughness along tectonic ...

Nature Research2019

Numerical analysis of fragmentation in tempered glass with parallel dynamic insertion of cohesive elements

Jean-François Molinari, Marco Vocialta, Mauro Corrado

Tempered glass panes are subjected to high eigenstresses that induce a state of compression along the surfaces and a state of tension in the inner part. Whenever a crack reaches the tensile region, it rapidly propagates and branches in all directions drive ...

2018

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

Jean-François Molinari, Aurelia Isabel Cuba Ramos, Mauro Corrado, Clément Pierre Mathieu Roux-Langlois

Pergamon-Elsevier Science Ltd2018

Coupled atomistic/discrete dislocation method in 3D Part II: Validation of the method

Jean-François Molinari, Guillaume Anciaux, William Curtin, Max Ludwig Hodapp

2018

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