A5007134552- Gear and Bearing Dynamics Analysis
- Tribology and Lubrication Engineering
- Adhesion, Friction, and Surface Interactions
- Lubricants and Their Additives
- Mechanical stress and fatigue analysis
- Tribology and Wear Analysis
- Numerical methods in engineering
- Advanced Numerical Methods in Computational Mathematics
- Metal Alloys Wear and Properties
- Electrical Contact Performance and Analysis
- Engineering and Materials Science Studies
- Structural Analysis of Composite Materials
- Electromagnetic Simulation and Numerical Methods
- Mechanical Engineering and Vibrations Research
- Hydraulic and Pneumatic Systems
- Computational Fluid Dynamics and Aerodynamics
- Contact Mechanics and Variational Inequalities
- Force Microscopy Techniques and Applications
- Composite Material Mechanics
- Advanced Numerical Analysis Techniques
- Iterative Learning Control Systems
- Semiconductor Lasers and Optical Devices
- Electronic Packaging and Soldering Technologies
- Brake Systems and Friction Analysis
- Advanced machining processes and optimization
Centre National de la Recherche Scientifique
2014-2023
Université Claude Bernard Lyon 1
2014-2023
Institut National des Sciences Appliquées de Lyon
2014-2023
Université de Lyon
2009-2021
Laboratoire de Mécanique des Contacts et des Structures
2010-2021
Interface (United States)
2020
Laboratoire Mécanique des Solides
2011
Imperial College London
2001
University of Twente
1986-2000
SKF (Netherlands)
1991-1994
This paper presents a numerical study of the effects inlet supply starvation on film thickness in EHL point contacts. Generally this problem is treated using position meniscus as governing parameter; however, it difficult to measure real applications. Thus, an alternative approach adopted whereby amount oil present surfaces used define degree starvation. It property which determines both and reduction. The effect subsequent overrollings decay can also be evaluated. In simplest case constant...
This paper investigates the influence of a transverse ridge on film thickness in circular EHL contact under rolling/sliding conditions. It is numerical simulation optical work Kaneta et al. (1992). One purposes this investigation to check validity algorithm and Newtonian, isothermal lubricant assumption for predictions these conditions (ph = 0.54 GPa). will be shown that, both quantitatively, central axis Y 0, qualitatively, profile through “pseudo interference graphs”, agreement between...
This paper focuses on the lubrication behavior of starved elliptical Elasto-HydroDynamic (EHD) contacts. Starvation is governed by amount lubricant available in inlet region and can result much thinner films than occurring under fully flooded conditions. Therefore, it would be desirable to able predict onset severity starvation relate film reduction directly operating conditions properties. The aim this work explore influence these parameters starvation. A combined modeling experimental...
The effect of longitudinal and transverse roughness on the elastohydrodynamic lubrication circular contacts was investigated numerically for two different lubricating conditions. influence amplitude wavelength texture also studied. results are compared with predictions from flow factor method.
Film thickness and pressure profiles have been calculated for line contacts at moderate high loads, using a Multigrid method. Influence of the compressibility lubricant on minimum film spike has examined. The required computing time is an order magnitude less than when previous methods.
The most time-consuming routine in the present EHL and dry contact computations is calculation of elastic deformation integrals. Using Multilevel Multi-Integration (MLMI) these integrals can be computed O(n log n) instead O(n2) operations. This fast integration applied to problem. To make optimal use this integration, it also necessary construct an efficient solver for integral equation. again accomplished using multilevel techniques. total complexity new O (n which gives a big reduction...
Abstract An impressive superlow coefficient of friction (CoF) as low 0.004 (nearly equivalent to the rolling coefficient) was obtained by sliding a steel ball against tetrahedral amorphous diamond-like carbon (ta-C) coating in glycerol under boundary lubrication regime. X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM) revealed substantial changes surface chemistry topography track. As shown XPS analysis, transfer iron atoms from ta-C layer occurred, forming...
This paper investigates in detail the influence of two different surface topographies on pressure distribution and film thickness profile a highly loaded (maximum Hertzian 2 GPa) line contact as function slide to roll ratio. To accomplish this transient Reynolds equation is solved both space time. The first feature under investigation localized, so-called indentation, second one global: waviness. observed lack synchronism extremes explained theoretically by analyzing equation. minimum...
Abstract Surface roughness and/or surface imperfections are well known to significantly affect the performance of concentrated contacts. Any deviation from smooth will act as a stress raiser for itself (bump) or its neighborhood (dent), and therefore reduce fatigue life component it is part of. These can also initiation sites other types contact failure such scuffing, when conditions load, speed film thickness become more severe. With help increasing computer speeds efficient numerical...
This article traces the contribution of Dowson and Higginson work to numerical line contact elasto-hydrodynamic lubricated film thickness prediction Hamrock in elliptical contacts. Considering work, this shows that both pressure results curve-fitted predictions are very accurate, even by today's standards. Concerning results, authors show original remain surprisingly accurate but issue minimum central thicknesss ration H m / c is not yet completely settled. The then continues discuss some...
Micro-texturing is very efficient to make surfaces super-hydrophobic according a physical process known as ‘lotus effect’. In the recent past, tribologists have also investigated surface texturing because it could be promising way increase lifetime of contacts or its working conditions more severe. Moreover, significant friction coefficient reductions been obtained with textured in different lubrication regimes. this presentation, transient phenomena induced by laser-made circular dimples...
Detailed and accurate film thickness pressure profiles have been calculated for point contacts at moderate high loads, using a multigrid method. The influence of the compressibility lubricant number nodal points on minimum maximum spike examined. required computing time is two orders magnitude less, compared with calculations “classical” iterative methods.
The detailed understanding of elastohydrodynamic lubrication (EHL) with rough surfaces has become an important problem as the ratio film thickness to surface roughness is decreasing. Recently it been recognized that inside EHL contact might be different from outside owing elastic deformation. As will explained in this paper, a first step deformation real knowledge amplitude reduction harmonic features, which forms topic paper. For line shown deformed feature (waviness) depends on original...