A5007064413- Adhesion, Friction, and Surface Interactions
- High-Velocity Impact and Material Behavior
- Force Microscopy Techniques and Applications
- Mechanical stress and fatigue analysis
- Rock Mechanics and Modeling
- Numerical methods in engineering
- Tribology and Wear Analysis
- Microstructure and mechanical properties
- Lubricants and Their Additives
- Granular flow and fluidized beds
- Tribology and Lubrication Engineering
- Metal and Thin Film Mechanics
- Gear and Bearing Dynamics Analysis
- Fluid Dynamics Simulations and Interactions
- Brake Systems and Friction Analysis
- Geotechnical and Geomechanical Engineering
- earthquake and tectonic studies
- High-pressure geophysics and materials
- Advanced ceramic materials synthesis
- Concrete and Cement Materials Research
- Diamond and Carbon-based Materials Research
- Landslides and related hazards
- Composite Material Mechanics
- Contact Mechanics and Variational Inequalities
- Structural Response to Dynamic Loads
École Polytechnique Fédérale de Lausanne
2015-2024
Max-Planck-Institut für Nachhaltige Materialien
2024
Centre des Matériaux
2017
Université Paris Sciences et Lettres
2017
Centre National de la Recherche Scientifique
2007-2017
ParisTech
2017
École Nationale de l’Aviation Civile
2017
École Normale Supérieure Paris-Saclay
2007-2014
Laboratoire de Mécanique des Sols, Structures et Matériaux
2011
Université de Lorraine
2010
Finite-element methods are used to study nonadhesive, frictionless contact between elastic solids with self-affine surfaces. We find that the total area rises linearly load at small loads. The mean pressure in regions is independent of and proportional root-mean-square slope surface. constant proportionality nearly Poisson ratio roughness exponent lies previous analytic predictions. morphology also analyzed. Connected have a fractal perimeter. probability finding cluster a(c) drops as a(-tau...
Abstract The adhesive wear process remains one of the least understood areas mechanics. While it has long been established that is a direct result contacting surface asperities, an agreed upon understanding how asperities lead to debris particle remained elusive. This restricted prediction empirical models with limited transferability. Here we show discrepant observations and predictions two distinct mechanisms can be reconciled into unified framework. Using atomistic simulations model...
Abstract In this paper, two brittle fracture problems are numerically simulated: the failure of a ceramic ring under centrifugal loading and crack branching in PMMA strip. A three‐dimensional finite element package which cohesive elements dynamically inserted has been developed. The elements' strength is chosen to follow modified weakest link Weibull distribution. probability introducing weak set increase with size. This reflects physically based effect according larger more likely contain...
Calcite is among the most abundant minerals on earth and plays a central role in many environmental geochemical processes. Here we used amplitude modulation atomic force microscopy (AFM) operated particular regime to visualize single ions close (1014) surface of calcite solution. The results were acquired at equilibrium, aqueous solution containing different concentrations NaCl, RbCl, CaCl(2). AFM images provide direct atomic-level picture cations adsorbed preferentially certain locations...
A hybrid simulation method is introduced and used to study two-dimensional single-asperity multi-asperity contacts both quasistatically dynamically. The combines an atomistic treatment of the interfacial region with a finite-element description subsurface deformations. dynamics in two regions are coupled through displacement boundary conditions applied at outer edges overlap region. solutions followed concurrently but different time resolution. benchmarked against full simulations. Accurate...
Significance Wear causes a huge amount of material and energy losses annually, with serious environmental, economic, industrial consequences. Despite considerable progress in the 19th century, scientific understanding wear remains mainly empirical. This study reveals long-standing microscopic origins detachment from solids surface, at most fundamental level, i.e., particles. It discloses that detached particle volume can be estimated without any empirical factor, via frictional work. unifies...
SUMMARY 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 process controlled by new extrinsic traction separation law, which accounts for mode mixity, yields two separate values energy dissipation in I II loading, impenetrability condition enforced with contact algorithm. resort to classical law unilateral Coulomb friction. algorithm coupled together approach order have...
Wear is the inevitable damage process of surfaces during sliding contact. According to well-known Archard's wear law, volume scales with real contact area and as a result proportional load. Decades experiments, however, show that this relation only holds up certain load limit, above which linearity broken transition from mild severe occurs. We investigate microscopic origins breakdown corresponding at asperity level. Our atomistic simulations reveal interaction between subsurface stress...
Abstract Friction and wear depend critically on surface roughness its evolution with time. An accurate control of is essential to the performance durability virtually all engineering applications. At geological scales, along tectonic faults intimately linked stick-slip behaviour as experienced during earthquakes. While numerous experiments natural, fractured, frictional sliding surfaces have shown that has self-affine fractal properties, much less known about mechanisms controlling origins...