Jean-François Molinari

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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 ...

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 ...

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 ...

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 ...

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 ...

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 on an Hertzian contact. Various measures are provided ...

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 ...

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 ...

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 ...

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 ...

The Discrete element method (DEM) is a robust numerical tool for simulating crack propagation and wear in granular materials. However, the computational cost associated with DEM hinders its applicability to large domains. To address this limitation, we emp ...

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 ...

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 ...

Jean-François Molinari

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

Numerical analysis of the effects of residual stresses in concrete

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

Effect of wear particles and roughness on nanoscale friction

The autocorrelation function for island areas on self-affine surfaces

Contact mechanics at the nanoscale, a 3D multiscale approach

Modeling and simulation in tribology across scales: An overview

Contact mechanics with a multiscale approach

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

The role of hardness in the surface roughness evolution during adhesive wear processes

A mesoscale fracture model for concrete

Guest editorial: Special Issue on Science of Wear

Effects of residual stresses on the tensile fatigue behavior of concrete

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

Two-scale concurrent simulations for crack propagation using FEM–DEM bridging coupling

Effect of normal loading on grain boundary migration and sliding in copper

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

Normal contact between rough surfaces by the Discrete Element Method

Computational micromechanics of dynamic compressive loading of a brittle polycrystalline material using a distribution of grain boundary properties

Contact élastoplastique : équations intégrales accélérées par une approche Fourier