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33 results on '"Jérôme Cavoret"'

4. On the interest of a semi-empirical model for the tooth friction coefficient in gear transmissions

Author

Yasser Diab, Fabrice Ville, Christophe Changenet, Pierre Navet, Thomas Touret, Nicolas Grenet De Bechillon, Jérôme Cavoret, and Romain Quiban

Subjects
Physics::Fluid Dynamics, Friction coefficient, Vibration, Surface (mathematics), Semi empirical model, Materials science, Mechanical Engineering, Surfaces and Interfaces, Mechanics, Lubricant, Surfaces, Coatings and Films
Abstract

Accurate modelling of friction coefficient is of primary importance in efficiency, vibration and failure analyses of enclosed gear drives. After showing the influence of surface/lubricant interactions on friction, the authors used a semi-empirical model which can take all these aspects into account. Lubricant is modelled as an Eyring–Reynolds fluid and rough surfaces are described with two parameters via a stochastic approach. A specific two-disc machine is used to perform series of friction measurements on smooth and rough discs. Smooth discs allow to operate under full film lubrication and to measure a reference shear stress of lubricant, whereas rough discs reproduce gear tooth roughness and generate a representative value of friction on asperities. The purpose of this present paper is to describe calculations of this physical-based friction coefficient model and to present the experimental process. On the basis of new results, the impact of a surface finishing process is assessed as well as the consequence of calculating friction coefficient based on oil injection instead of local bulk temperature.

Published
2021
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5. Thermal Modeling of the FZG Test Rig: Application to Starved Lubrication Conditions

Author

Christophe Changenet, D. Ghribi, P. Navet, Jérôme Cavoret, and Fabrice Ville

Subjects
Materials science, Mechanical Engineering, Test rig, 02 engineering and technology, Surfaces and Interfaces, 021001 nanoscience & nanotechnology, Surfaces, Coatings and Films, 020303 mechanical engineering & transports, 0203 mechanical engineering, Mechanics of Materials, Thermal, Lubrication, Composite material, 0210 nano-technology
Abstract

During their lifetime, gears may undergo starved lubrication operating conditions. Starvation has an impact on friction between gears and leads to modified gearbox efficiency. In this article, lubr...

Published
2020
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6. Experimental investigation on the effect of micropitting on friction - Part 2: Analysis of power losses evolution on a geared system

Author

Jérôme Cavoret, Fabrice Ville, T. Touret, Christophe Changenet, Laboratoire de Mécanique des Contacts et des Structures [Villeurbanne] (LaMCoS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), and Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Power loss, Materials science, Mechanical Engineering, Nuclear engineering, Test rig, 02 engineering and technology, Surfaces and Interfaces, 021001 nanoscience & nanotechnology, Surfaces, Coatings and Films, Micro pitting, Power (physics), [SPI]Engineering Sciences [physics], 020303 mechanical engineering & transports, 0203 mechanical engineering, Mechanics of Materials, Surface roughness, 0210 nano-technology, Oil temperature
Abstract

In this paper, an experimental investigation on a FZG test rig is presented. The proposed approach aims to at highlight the influence of micropitting on power losses and temperatures in this geared system. Micropitting has been gradually developed on the gear pair by applying increasing load levels. The influence of this defect on power losses and temperatures has been evaluated with specific characterization tests performed alongside micropitting growth. The modification of the gear surface roughness was monitored during these tests. This study shows power loss and oil temperature increase due to micropitting development. Furthermore, it is possible to correlate power loss and temperature variations to surface feature measurements.

Published
2021
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7. Development of transformation bands in ceria-stabilized-zirconia based composites during bending at room temperature

Author

Jérôme Chevalier, Nicolas Courtois, Helen Reveron, Michael V. Swain, Damien Fabrègue, Philippe Sainsot, Alethea Liens, Jérôme Cavoret, Matériaux, ingénierie et science [Villeurbanne] (MATEIS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Mécanique des Contacts et des Structures [Villeurbanne] (LaMCoS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), and ANTHOGYR

Subjects
010302 applied physics, Materials science, Nucleation, 02 engineering and technology, Bending, Plasticity, 021001 nanoscience & nanotechnology, 01 natural sciences, Stress (mechanics), [SPI]Engineering Sciences [physics], Residual stress, Tension (geology), 0103 physical sciences, Materials Chemistry, Ceramics and Composites, Shielding effect, Composite material, 0210 nano-technology, ComputingMilieux_MISCELLANEOUS, Stress concentration
Abstract

Transformation-induced plasticity in a ceria-stabilized-zirconia based composite was studied in four-point bending, with particular emphasis on nucleation and growth of tetragonal-to-monoclinic transformation bands. They initiated on the side in tension at a given value of stress and grow in size and number with increased applied load. The spacing between them was related to samples’ thickness: thicker samples led to a smaller number of larger/deeper bands. Residual stresses around indentations, placed on the tensile surface of some samples, triggered transformation bands nucleation but had no significant effect on the final total number of bands. A simple stress shielding model suggests that wide bands hinder adjacent thinner bands to propagate and expand because of stress shielding around them. Nucleation of a given transformation band is thus related to: (i) stress concentrations at the surface, (ii) geometry (stress-field inside the sample) and (iii) a shielding effect from the bands already present.

Published
2021
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8. Thermal analysis of twin-disc machine for traction tests and scuffing experiments

Author

Samuel Raymond Germain Becquerelle, Fabrice Ville, Christophe Changenet, G Isaac, and Jérôme Cavoret

Subjects
Friction coefficient, Materials science, Mechanical Engineering, Heat transfer, Thermal, Bulk temperature, Traction (engineering), Lubrication, Surfaces and Interfaces, Mechanics, Thermal model, Thermal analysis, Surfaces, Coatings and Films
Abstract

Literature agrees that thermal effects have a great influence on friction. However, the heat flows and the thermal behaviour of test rigs used to characterize friction coefficient are largely dependent on their architecture. As a consequence, some discrepancies can be noted between the frictional responses measured by different test benches. Therefore, a thermal model of a twin-disc machine has been developed using the thermal network methodology. This model allows thermal analyses of the traction tests performed with this twin-disc machine. The results reveal that the disc bulk temperature has a significant impact on friction coefficient. Some scuffing experiments are also studied thanks to this numerical model, and a thermal interpretation of classical scuffing criteria is proposed.

Published
2018
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10. Influence of the initial surface state of bodies in contact on the formation of white etching layers under dry sliding conditions

Author

Samuel Simon, O. Vargolici, P. Merino, Yves Berthier, Jérôme Cavoret, Fabrice Ville, and Aurélien Saulot

Subjects
Surface (mathematics), Work (thermodynamics), Materials science, Nital, 02 engineering and technology, Surfaces and Interfaces, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Surfaces, Coatings and Films, chemistry.chemical_compound, 020303 mechanical engineering & transports, Brittleness, 0203 mechanical engineering, chemistry, Mechanics of Materials, Nitric acid, Etching (microfabrication), Thermal, Materials Chemistry, Forensic engineering, Composite material, 0210 nano-technology, Layer (electronics)
Abstract

The white etching layer (WEL) is a bright layer formed on the surface of steel and revealed when the latter is etched with Nital solution (a solution of nitric acid and ethanol). WELs have been observed on rail running bands for more than half a century. They are brittle, about 3 times harder than the traditional rail steel used. Two mechanisms of white etching layer formation are known such as thermal mechanism: temperature increase and quick cooling, or mechanical formation. The main purpose of this work, is to study the influence of the initial state of the sample surfaces on WEL mechanical formation. The samples were either oxidized or run-in before testing on a twin-disc machine under 1 GPa contact pressure and 0.5% sliding ratio. The results presented incomplete WELs to fully formed WELs at the surface of the disks. The initial run-in or oxidized surface facilitated the birth of WEL and reduced wear.

Published
2016
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11. Particle Entrapment in Rolling Element Bearings: The Effect of Ellipticity, Nature of Materials, and Sliding

Author

Vincent Strubel, Philippe Vergne, Yves Maheo, Jérôme Cavoret, Alexandre Mondelin, Fabrice Ville, Nicolas Fillot, Tribologie et Mécanique des Interfaces (TMI), Laboratoire de Mécanique des Contacts et des Structures [Villeurbanne] (LaMCoS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Systèmes Mécaniques et Contacts (SMC), SKF - Aerospace [Saint-Vallier], and SKF

Subjects
[SPI.OTHER]Engineering Sciences [physics]/Other, Materials science, Mechanical Engineering, Metallurgy, Particle entrapment, 02 engineering and technology, Surfaces and Interfaces, 021001 nanoscience & nanotechnology, rolling–sliding condition, hybrid ceramic–steel contacts, Surfaces, Coatings and Films, Entrapment, 020303 mechanical engineering & transports, elliptical contacts, 0203 mechanical engineering, Mechanics of Materials, Rolling-element bearing, Ball (bearing), Lubricant, Composite material, 0210 nano-technology
Abstract

This study on particle entrapment within elastohydrodynamic contacts reports experimental tests mimicking rolling element bearing contacts using a twin-disc machine with a contaminated lubricant as well as numerical simulations. The ball bearing contacts might be nonideally circular, composed of a hybrid couple of contact materials, and operated under rolling–sliding conditions. This study focused on the relative importance of each of these configurations to the mechanisms responsible for particle entrapment. It was found experimentally and confirmed numerically that the contact ellipticity is of primary importance to entrapment probability. Tests mixing two-by-two pure rolling and non-zero slide-to-roll ratios (SRRs) and different materials and contact configurations revealed combined mechanisms leading to entrapment and surface damage.

Published
2016
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12. Boundary lubrication: Influence of the size and structure of inorganic fullerene-like MoS2 nanoparticles on friction and wear reduction

Author

Jérôme Cavoret, Pavel Afanasiev, Fabrice Dassenoy, Thierry Le Mogne, Fabrice Ville, Moussa Diaby, Pierre Rabaso, and Béatrice Vacher

Subjects
Splash, Materials science, Metallurgy, Nanoparticle, 02 engineering and technology, Surfaces and Interfaces, Tribology, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Surfaces, Coatings and Films, Crystallinity, 020303 mechanical engineering & transports, 0203 mechanical engineering, X-ray photoelectron spectroscopy, Mechanics of Materials, Materials Chemistry, Lubrication, Nanotribology, Composite material, 0210 nano-technology, Dry lubricant
Abstract

The use of Inorganic Fullerene-like (IF) nanoparticles in lubricants has proved extremely effective to reduce friction and wear under severe boundary lubrication conditions. It has furthermore been suggested that the synthesis of smaller nanoparticles containing many structural defects would benefit friction and wear reduction, as they would penetrate and exfoliate more easily in the contact, leading to the quick formation of homogeneous tribofilms. In this study, four different types of IF-MoS2 were synthesized so as to be able to differentiate the influence of both the size and the morphology of the nanoparticles on their tribological behavior. Pure-sliding, reciprocating tribological testing of these four types of nanoparticles revealed their excellent friction-reducing properties in severe boundary lubrication, with splash lubrication taking place for a high number of cycles. High wear reduction was also obtained and confirmed using optical profilometry. Although the nanoparticle structure was found to have an influence on their effectiveness in time, all the nanoparticles tested – regardless of size or crystallinity – were found to achieve the same performances as long as proper oil recirculation took place, ensuring a continuous feeding of the contact in nanoparticles. The formation of MoS2 tribofilms on the wear surfaces was confirmed using XPS analyses and observed on FIB cross sections, and their nature was discussed in the light of the associated tribological results. As the size and morphology of the IF-MoS2 did not affect their performance in the range studied, their friction reducing properties were compared to those of bulk h-MoS2 tested in the same conditions. The benefits of using spherical nanoparticles such as IF-MoS2 was clearly shown.

Published
2014
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13. Understanding white etching cracks in rolling element bearings: Formation mechanisms and influent tribochemical drivers

Author

Arnaud Ruellan, Bernard Liatard, Xavier Kleber, Jérôme Cavoret, Fabrice Ville, Laboratoire de Mécanique des Contacts et des Structures [Villeurbanne] (LaMCoS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Matériaux, ingénierie et science [Villeurbanne] (MATEIS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Systèmes Mécaniques et Contacts (SMC), Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), and NTN-SNR

Subjects
Materials science, rolling contact fatigue, Mechanical Engineering, Metallurgy, Rolling contact fatigue, Surfaces and Interfaces, [SPI.MECA]Engineering Sciences [physics]/Mechanics [physics.med-ph], Tribology, Surfaces, Coatings and Films, hydrogen embrittlement, wind turbines, white etching cracks, Rolling element bearings, tribochemical drivers, Hydrogen embrittlement
Abstract

International audience; Among prevalent tribological failures in rolling element bearings, a peculiar rolling contact fatigue mode has been defined as white etching cracks, which correspond to broad subsurface three-dimensional branching crack networks bordered by white etching microstructure. White etching cracks tend to appear before other conventional rolling contact fatigue microstructural alterations and eventually lead to premature flaking or radial cracking that remains unpredictable using fatigue life estimations. Even though they have been reported for several decades, occurrences present no common evident denominator and are delicate to reproduce on laboratory test rigs without artificial hydrogen charging. In this study, white etching crack reproductions on two different standard endurance test rigs are compared and analyzed in order to, firstly, propose, an update of the understanding of white etching crack surface affected tribochemical formation mechanisms, and secondly, to identify influent tribochemical and mechanical drivers. If white etching cracks are associated to different combinations of specific non-self-sufficient macroscopic drivers depending on the application or the test rig, evidences demonstrate that they often come down to similar phenomena at a microscopic tribological scale that should all be mastered for efficient white etching crack reproduction and countermeasure design.

Published
2014
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14. Understanding white etching cracks in rolling element bearings: State of art and multiple driver transposition on a twin-disc machine

Author

Fabrice Ville, Jérôme Cavoret, Arnaud Ruellan, Bernard Liatard, Xavier Kleber, Laboratoire de Mécanique des Contacts et des Structures [Villeurbanne] (LaMCoS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Matériaux, ingénierie et science [Villeurbanne] (MATEIS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), and NTN-SNR ROULEMENTS [Annecy]

Subjects
Engineering, Cracks, Tribology, Friction, Test rig, Rolling contact fatigue, Mechanical engineering, 02 engineering and technology, Outages, law.invention, [SPI.MAT]Engineering Sciences [physics]/Materials, Analysis of various, 0203 mechanical engineering, law, Rolling Element Bearing, Hydrogen evolution, Bearings (machine parts), Risk assessment, Bearing (mechanical), business.industry, Mechanical Engineering, Electrical potential, Surfaces and Interfaces, Lubrication regimes, Electric machine control, 021001 nanoscience & nanotechnology, Roller bearings, Surfaces, Coatings and Films, Lubricant additives, 020303 mechanical engineering & transports, Twin-disc machine, Etching, Water pollution, Formation mechanism, State of art, 0210 nano-technology, business, Failure mode and effects analysis, Fatigue of materials, Hydrogen embrittlement
Abstract

cited By 2; International audience; Among the prevalent tribological failures affecting rolling element bearings, an unconventional rolling contact fatigue mode has been identified as white etching cracks. Those correspond to three-dimensional branching crack networks partially bordered by white etching microstructure, eventually leading to premature and unpredictable failure. Recent work supports that this failure mode may be associated with various combinations of operating conditions depending on the application or test rig, but that all seem to converge towards similar tribological drivers related to surface-affected hydrogen evolution at asperity scales, which is known to embrittle the bearing steel. Nevertheless, as white etching cracks remain delicate to reproduce without artificial hydrogen charging, the underlying formation mechanisms remain unsettled. The present work aims to better understand how some of the main tribomechanical and tribochemical drivers may trigger white etching cracks and premature failures. In this study drivers such as sliding kinematics, water contamination, and electrical potential and lubricant additives are progressively transposed on a twin-disc machine that provides an enhanced control of contact parameters. Various attempts advocate that the tested drivers are not self-sufficient to reproduce the failure mode in such apparatus, but confirm that specific lubricant additives may reduce the fatigue life by promoting surface-initiated embrittled cracking similar to white etching cracks. A local criterion accounting for the local sliding frictional power dissipation and the lubrication regime is further proposed to assess the risk of white etching cracks based on the analysis of various reproduction and occurrences. © IMechE 2016.

Published
2017
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15. An Experimental Study and Model Determination of the Mechanical Stiffness of Paper Folds

Author

Jérôme Cavoret, Fabrice Ville, Clémentine Pradier, Claire Jean-Mistral, David Dureisseix, Département Génie Mécanique Développement (GMD), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA), Systèmes Mécaniques et Contacts (SMC), Laboratoire de Mécanique des Contacts et des Structures [Villeurbanne] (LaMCoS), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), and Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Engineering, Hinge, 02 engineering and technology, Kinematics, [PHYS.MECA.MEMA]Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph], [PHYS.MECA.STRU]Physics [physics]/Mechanics [physics]/Structural mechanics [physics.class-ph], 0203 mechanical engineering, medicine, Quantitative Biology::Biomolecules, Principle of locality, business.industry, Mechanical Engineering, Compliant mechanism, Stiffness, Structural engineering, Fold (geology), [INFO.INFO-NA]Computer Science [cs]/Numerical Analysis [cs.NA], 021001 nanoscience & nanotechnology, Computer Graphics and Computer-Aided Design, Torsion spring, Computer Science Applications, Nonlinear system, 020303 mechanical engineering & transports, Mechanics of Materials, medicine.symptom, 0210 nano-technology, business, Algorithm
Abstract

The authors wish to thank Arjowiggins Creative Papers for letting us choose their Conqueror CX22 120g/m2 paper, and especially J.-M. Baumlin, from the Research and Development Center, who took interest in our research and provided us meaningful information.; International audience; Over the past few decades folding paper has extended beyond the origami deployable applications to reach the engineering field. Nevertheless, mechanical information about paper behavior is still lacking, especially during folding/unfolding.This article proposes an approach to characterize the paper fold behavior in order to extract the material data that will be needed for the simulation of folding and to go a step further the single kinematics of origami mechanisms. The model developed herein from simple experiments for the fold behavior relies on a macroscopic local hinge with a non-linear torsional spring.Though validated with only straight folds, the model is still applicable in the case of curved folds thanks to the locality principle of the mechanical behavior. The influence of both the folding angle and the fold length are extracted automatically from a set of experimental values exhibiting a deterministic behavior and a variability due to the folding process.The goal is also to propose a methodology that may extend the simple case of the paper crease, or even the case of thin material sheets, and may be adapted to other identification problems.

Published
2016
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16. Particle Entrapment in Hybrid Lubricated Point Contacts

Author

Yves Maheo, Philippe Vergne, Vincent Strubel, Fabrice Ville, Alexandre Mondelin, Jérôme Cavoret, Nicolas Fillot, Tribologie et Mécanique des Interfaces (TMI), Laboratoire de Mécanique des Contacts et des Structures [Villeurbanne] (LaMCoS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Systèmes Mécaniques et Contacts (SMC), SKF - Aerospace [Saint-Vallier], and SKF

Subjects
[SPI.OTHER]Engineering Sciences [physics]/Other, Materials science, Silicon, Mechanical Engineering, chemistry.chemical_element, 02 engineering and technology, Surfaces and Interfaces, Mechanics, 021001 nanoscience & nanotechnology, Surfaces, Coatings and Films, Entrapment, [SPI]Engineering Sciences [physics], 020303 mechanical engineering & transports, 0203 mechanical engineering, chemistry, Mechanics of Materials, Particle, Point (geometry), Composite material, 0210 nano-technology
Abstract

International audience; This study proposes an innovative approach for the study of particle entrapment in rolling element bearings (REBs). Two couples of contacting materials were considered, the classical steel–steel and silicon nitride–steel used in hybrid bearings. Numerical simulations, as well as experiments, combine theoretical trajectories for incoming contaminant particles and effective entrapment ratios observed within a twin-disc machine. Linking both approaches allows the highlighting of some key parameters leading to particle entrapment under pure rolling conditions in elastohydrodynamic point contacts.

Published
2016
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17. Effect of Intergranular Carbides Induced by Gas Nitriding on Rolling Contact Fatigue

Author

Marion Le, Xavier Kleber, Fabrice VILLE, Jérôme Cavoret, Marie-Christine Sainte-Catherine, Laurence Briançon, Laboratoire de Mécanique des Contacts et des Structures [Villeurbanne] (LaMCoS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Matériaux, ingénierie et science [Villeurbanne] (MATEIS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Direction générale de l'armement [Bagneux] (DGA), DCNS Group [Nantes] (DCNS-Nantes), DCNS group, STLE, and Ville, Fabrice

Subjects
[SPI.MECA]Engineering Sciences [physics]/Mechanics [physics.med-ph], [SPI.MECA] Engineering Sciences [physics]/Mechanics [physics.med-ph], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2015

18. Effect of Dispersants on the Lubricating Properties of IF-MoS2 Nanoparticles

Author

Fabrice Dassenoy, Béatrice Vacher, Thierry Le Mogne, Pierre Rabaso, Fabrice VILLE, Moussa Diaby, Jérôme Cavoret, Laboratoire de Tribologie et Dynamique des Systèmes (LTDS), École Centrale de Lyon (ECL), Université de Lyon-Université de Lyon-École Nationale des Travaux Publics de l'État (ENTPE)-Ecole Nationale d'Ingénieurs de Saint Etienne-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Mécanique des Contacts et des Structures [Villeurbanne] (LaMCoS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), PSA Peugeot - Citroën (PSA), PSA Peugeot Citroën (PSA), and STLE

Subjects
[SPI.MECA]Engineering Sciences [physics]/Mechanics [physics.med-ph], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2015

19. An experimental study and model determination of the stiffness of paper folds

Author

Clémentine Pradier, Jérôme Cavoret, David Dureisseix, Claire Jean-Mistral, Fabrice VILLE, Département Génie Mécanique Développement ( GMD ), Institut National des Sciences Appliquées de Lyon ( INSA Lyon ), Université de Lyon-Institut National des Sciences Appliquées ( INSA ) -Université de Lyon-Institut National des Sciences Appliquées ( INSA ), Laboratoire de Mécanique des Contacts et des Structures [Villeurbanne] ( LaMCoS ), Université de Lyon-Institut National des Sciences Appliquées ( INSA ) -Université de Lyon-Institut National des Sciences Appliquées ( INSA ) -Centre National de la Recherche Scientifique ( CNRS ), ESPCI, GDR MéPhy, Département Génie Mécanique Développement (GMD), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon, Laboratoire de Mécanique des Contacts et des Structures [Villeurbanne] (LaMCoS), Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), and Dureisseix, David

Subjects
[PHYS.MECA.STRU] Physics [physics]/Mechanics [physics]/Structural mechanics [physics.class-ph], [PHYS.MECA.STRU]Physics [physics]/Mechanics [physics]/Mechanics of the structures [physics.class-ph], [PHYS.PHYS.PHYS-DATA-AN] Physics [physics]/Physics [physics]/Data Analysis, Statistics and Probability [physics.data-an], [ PHYS.MECA.STRU ] Physics [physics]/Mechanics [physics]/Mechanics of the structures [physics.class-ph], [PHYS.PHYS.PHYS-DATA-AN]Physics [physics]/Physics [physics]/Data Analysis, Statistics and Probability [physics.data-an], ComputingMilieux_MISCELLANEOUS, [ PHYS.PHYS.PHYS-DATA-AN ] Physics [physics]/Physics [physics]/Data Analysis, Statistics and Probability [physics.data-an]
Abstract

International audience

Published
2015

20. Influence of grain boundary cementite induced by gas nitriding on the rolling contact fatigue of alloyed steels for gears

Author

Laurence Briançon, Marion Le, Xavier Kleber, Jérôme Cavoret, Fabrice Ville, Marie C Sainte-Catherine, Laboratoire de Mécanique des Contacts et des Structures [Villeurbanne] (LaMCoS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Matériaux, ingénierie et science [Villeurbanne] (MATEIS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), DCNS Group [Nantes] (DCNS-Nantes), DCNS group, and Direction générale de l'armement [Bagneux] (DGA)

Subjects
Materials science, Cementite, Mechanical Engineering, Metallurgy, Rolling contact fatigue, Surfaces and Interfaces, [SPI.MECA]Engineering Sciences [physics]/Mechanics [physics.med-ph], nitriding, Surfaces, Coatings and Films, Micro pitting, chemistry.chemical_compound, pitting, chemistry, Grain boundary, grain boundary cementite, micro-pitting, Nitriding, twin-disc machine
Abstract

International audience; It is well-known that rolling contact fatigue life can be increased by modifying gear surfaces. For instance, gas nitriding is a thermochemical treatment enhancing superficial hardness, and introducing compressive residual stresses but nitriding alloys can lead to the precipitation of cementite at grain boundaries. In this study, experiments were performed on a twin-disc machine to investigate the influence of the microstructure of nitrided layers on rolling contact fatigue failure modes. Nitrided layers with small grains, thin and short grain boundary cementite filaments showed better resistance to surface originated pitting compared with nitrided layers with coarse precipitates, for similar mechanical properties in terms of hardness and residual stresses. Moreover, examinations carried out on cross sections throughout crack networks revealed the influence of these precipitates on the propagation of rolling contact fatigue cracks, which is at the origin of the differences in performance between thin and coarse microstructures

Published
2015
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21. Study on Traction Experiments

Author

Laruelle Sandrine, Fabrice VILLE, Brandao, Jose A., Seabra, Jorge H. O., Jérôme Cavoret, Christophe Changenet, Ville, Fabrice, Laboratoire de Mécanique des Contacts et des Structures [Villeurbanne] (LaMCoS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Universidade do Porto, LabECAM, ECAM Lyon (ECAM Lyon), and STLE

Subjects
[SPI.MECA]Engineering Sciences [physics]/Mechanics [physics.med-ph], [SPI.MECA] Engineering Sciences [physics]/Mechanics [physics.med-ph], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2015

22. Thermal investigations on scuffing using a twin-disc machine

Author

Isaac Grégoire, Fabrice VILLE, Christophe Changenet, Jérôme Cavoret, Samuel Becquerelle, Ville, Fabrice, Laboratoire de Mécanique des Contacts et des Structures [Villeurbanne] (LaMCoS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), LabECAM, ECAM Lyon (ECAM Lyon), Hispano Suiza, HISPANO SUIZA, and STLE

Subjects
[SPI.MECA]Engineering Sciences [physics]/Mechanics [physics.med-ph], [SPI.MECA] Engineering Sciences [physics]/Mechanics [physics.med-ph], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2015

23. Boundary lubrication: Influence of the size and structure of inorganic fullerene-like MoS2 nanoparticles on friction and wear reduction

Author

Pierre Rabaso, Fabrice VILLE, Fabrice Dassenoy, Moussa Diaby, Pavel Afanasiev, Jérôme Cavoret, Béatrice Vacher, Thierry Le Mogne, Laboratoire de Mécanique des Contacts et des Structures [Villeurbanne] (LaMCoS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Tribologie et Dynamique des Systèmes (LTDS), École Centrale de Lyon (ECL), Université de Lyon-Université de Lyon-École Nationale des Travaux Publics de l'État (ENTPE)-Ecole Nationale d'Ingénieurs de Saint Etienne (ENISE)-Centre National de la Recherche Scientifique (CNRS), Consortium Lyon Saint-Etienne de Microscopie (CLYM), École normale supérieure de Lyon (ENS de Lyon)-École Centrale de Lyon (ECL), Université de Lyon-Université de Lyon-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Jean Monnet - Saint-Étienne (UJM), PSA Peugeot-Citroen, PSA Peugeot Citroën (PSA), IRCELYON-Catalyse Hétérogène pour la Transition Energétique (CATREN), Institut de recherches sur la catalyse et l'environnement de Lyon (IRCELYON), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université de Lyon-Université de Lyon-École Nationale des Travaux Publics de l'État (ENTPE)-Ecole Nationale d'Ingénieurs de Saint Etienne-Centre National de la Recherche Scientifique (CNRS), École normale supérieure - Lyon (ENS Lyon)-École Centrale de Lyon (ECL), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Jean Monnet [Saint-Étienne] (UJM), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)

Subjects
[CHIM.CATA]Chemical Sciences/Catalysis, [SDE.ES]Environmental Sciences/Environmental and Society, [SPI.MAT]Engineering Sciences [physics]/Materials
Abstract

SSCI-VIDE+ECI2D+PAF; International audience; The use of Inorganic Fullerene-like (IF) nanoparticles in lubricants has proved extremely effective to reduce friction and wear under severe boundary lubrication conditions, It has furthermore been suggested that the synthesis of smaller nanoparticles containing many structural defects would benefit friction and wear reduction, as they would penetrate and exfoliate more easily in the contact, leading to the quick formation of homogeneous tribofilms. In this study, four different types of IF-MoS2 were synthesized so as to be able to differentiate the influence of both the size and the morphology of the nanoparticles on their tribological behavior. Pure-sliding, reciprocating tribological testing of these four types of nanoparticles revealed their excellent friction-reducing properties in severe boundary lubrication, with splash lubrication taking place for a high number of cycles. High wear reduction was also obtained and confirmed using optical profilometry. Although the nanoparticle structure was found to have an influence on their effectiveness in time, all the nanoparticles tested - regardless of size or crystallinity - were found to achieve the same performances as long as proper oil recirculation took place, ensuring a continuous feeding of the contact in nanoparticles. The formation of MoS2 tribofilms on the wear surfaces was confirmed using XPS analyses and observed on FIB cross sections, and their nature was discussed in the light of the associated tribological results. As the size and morphology of the IF-MoS2 did not affect their performance in the range studied, their friction reducing properties were compared to those of bulk h-MoS2 tested in the same conditions. The benefits of using spherical nanoparticles such as IF-MoS2 was clearly shown. (C) 2014 Elsevier B.V. All rights reserved.

Published
2014

24. An Investigation on the Reduced Ability of IF-MoS2 Nanoparticles to Reduce Friction and Wear in the Presence of Dispersants

Author

Béatrice Vacher, Fabrice Dassenoy, Jérôme Cavoret, Pierre Rabaso, Fabrice Ville, Michel Belin, Thierry Le Mogne, Moussa Diaby, Laboratoire de Tribologie et Dynamique des Systèmes (LTDS), École Centrale de Lyon (ECL), Université de Lyon-Université de Lyon-École Nationale des Travaux Publics de l'État (ENTPE)-Ecole Nationale d'Ingénieurs de Saint Etienne-Centre National de la Recherche Scientifique (CNRS), PSA Peugeot-Citroën [Voujeaucourt], PSA Peugeot Citroën (PSA), Laboratoire de Mécanique des Contacts et des Structures [Villeurbanne] (LaMCoS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Tools and models of nonlinear control theory for epidemiology and immunology (MASAIE), Laboratoire de Mathématiques et Applications de Metz (LMAM), Université Paul Verlaine - Metz (UPVM)-Centre National de la Recherche Scientifique (CNRS)-Université Paul Verlaine - Metz (UPVM)-Centre National de la Recherche Scientifique (CNRS)-Inria Nancy - Grand Est, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Institut Élie Cartan de Lorraine (IECL), Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), and Université de Lyon-Université de Lyon-École Nationale des Travaux Publics de l'État (ENTPE)-Ecole Nationale d'Ingénieurs de Saint Etienne (ENISE)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Materials science, rolling contact fatigue, Mechanical Engineering, Base oil, Nanoparticle, Surfaces and Interfaces, Adhesion, Tribology, [SPI.MECA]Engineering Sciences [physics]/Mechanics [physics.med-ph], Dispersant, Exfoliation joint, fractography, Surfaces, Coatings and Films, chemistry.chemical_compound, hydrogen embrittlement, chemistry, Mechanics of Materials, wind turbines, white etching cracks, Lubrication, Rolling element bearings, Composite material, Molybdenum disulfide
Abstract

International audience; Inorganic fullerene-like molybdenum disulfide (IF-MoS2) nanoparticles are known to exhibit great friction and wear-reducing abilities in severe boundary lubrication regimes, when added to a base oil alone. Their use in fully formulated lubricants was investigated in this study, and the tribological benefits attributed to the IF-MoS2 nanoparticles were found to be lost in the presence of dispersants. Various experimental techniques were used on three reference oils (base oil containing only IF-MoS2, only dispersants and both IF-MoS2 and dispersants) in order to understand the effect of succinimide-based dispersants on the three phases needed for effective nanoparticle-based lubrication, namely (1) the passing of the nanoparticles through the contact (2) the exfoliation of the IF-MoS2 inside the contact and (3) the adhesion of the released MoS2 platelets on the friction surfaces. The dispersants were shown to improve the dispersion of the nanoparticles in the oil by reducing their agglomeration, but prevented the adhesion of a low-friction MoS2 tribofilm on the steel surfaces. In-situ contact visualization revealed that the well-dispersed nanoparticles passed through the contact and exfoliated nanoparticles were observed after tribological testing. These results imply that nanoparticle dispersion itself does not seem to be an issue concerning nanoparticle effectiveness, even though the reduced agglomerate size and inertia may have affected nanoparticle flow near the contact, as well as entrapment and exfoliation conditions inside the contact. The use of succinimide-based dispersants may, however, have affected the tribochemistry of the contact, by an excessive adsorption on the steel surfaces and/or by encapsulating the released MoS2 platelets, preventing tribofilm adhesion. A balance was finally found between nanoparticle dispersion and friction reduction, but for very low dispersant concentrations and after a running-in period. The role of succinimide-based dispersants and their effect on nanoparticle lubrication were discussed in the light of these results.

Published
2014
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25. Influence of Gas Nitriding on Rolling Contact Fatigue: Application on Alloyed Steels for Gears

Author

Marion Le, Xavier Kleber, Fabrice VILLE, Jérôme Cavoret, Laurence Briançon, Marie-Christine Sainte-Catherine, Laboratoire de Mécanique des Contacts et des Structures [Villeurbanne] (LaMCoS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Matériaux, ingénierie et science [Villeurbanne] (MATEIS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), DCNS Group [Nantes] (DCNS-Nantes), DCNS group, Direction générale de l'armement [Bagneux] (DGA), and Ville, Fabrice

Subjects
[SPI.MECA]Engineering Sciences [physics]/Mechanics [physics.med-ph], [SPI.MECA] Engineering Sciences [physics]/Mechanics [physics.med-ph], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2014

26. Gear tooth pitting modelling and detection based on transmission error measurements

Author

Philippe Velex, Jérôme Cavoret, Nabih Feki, Fabrice Ville, Laboratoire de Mécanique des Contacts et des Structures [Villeurbanne] (LaMCoS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Systèmes Mécaniques et Contacts (SMC), and Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Institut National des Sciences Appliquées de Lyon (INSA Lyon)

Subjects
Engineering, experimental, Test rig, 02 engineering and technology, Gear, behavioral disciplines and activities, 01 natural sciences, Model validation, tooth pitting, [SPI]Engineering Sciences [physics], 0203 mechanical engineering, Gear tooth, 0103 physical sciences, 010301 acoustics, health care economics and organizations, transmission error, business.industry, Mechanical Engineering, Tooth surface, social sciences, Structural engineering, Experimental validation, Vibration, 020303 mechanical engineering & transports, Mechanics of Materials, Modeling and Simulation, population characteristics, business, human activities, Transmission errors
Abstract

In this study, an experimental validation of a 3D gear dynamic model in the presence of localised faults such as pitting on tooth flanks is proposed. The corresponding numerical model accounts for spur and helical gear systems including gear errors and deviations along with the supporting shafts and bearings. Simulation results are compared with the evidence from a back-to-back test rig and the model validation relies on loaded transmission error (TE) measurements. Many numerical and experimental results on dynamic behaviours due to the presence of tooth pitting in geared systems are presented. Based on TE measurements, it is demonstrated that the actual vibrations generated by gear tooth pitting validate the gear model and its extension to consider such tooth surface failures.

Published
2013
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27. Gear and Twin-disc test rigs : from reality to experimental modelling

Author

Marion Le, Pierre Rabaso, Arnaud Ruellan Du Crehu, Jérôme Cavoret, Vincent Baudin, Fabrice VILLE, Laboratoire de Mécanique des Contacts et des Structures [Villeurbanne] (LaMCoS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Systèmes Mécaniques et Contacts (SMC), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), and Ville, Fabrice

Subjects
[SPI]Engineering Sciences [physics], [SPI] Engineering Sciences [physics], ComputingMethodologies_GENERAL, ComputingMilieux_MISCELLANEOUS
Abstract

Poster; International audience

Published
2013

28. Analyse expérimentale de la fatigue de contact des boîtes de vitesses: vers la convergence des moyens expérimentaux

Author

Pierre Rabaso, Fabrice VILLE, Moussa Diaby, Jérôme Cavoret, Vincent Baudin, Pierre-Emmanuel Dumouchel, Franck Dupeu, Laboratoire de Mécanique des Contacts et des Structures [Villeurbanne] (LaMCoS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), PSA Peugeot-Citroen, PSA Peugeot Citroën (PSA), Systèmes Mécaniques et Contacts (SMC), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), and Ville, Fabrice

Subjects
[SPI]Engineering Sciences [physics], [SPI] Engineering Sciences [physics], ComputingMilieux_MISCELLANEOUS
Abstract

National audience

29. Une étude expérimentale et son modèle émergent de raideur du pli de papier

Author

Clémentine Pradier, Jérôme Cavoret, David Dureisseix, Claire Jean-Mistral, Fabrice VILLE, Association Française de Mécanique, Dureisseix, David, Service irevues, irevues, Département Génie Mécanique Développement (GMD), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA), Laboratoire de Mécanique des Contacts et des Structures [Villeurbanne] (LaMCoS), and Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.MECA.STRU] Physics [physics]/Mechanics [physics]/Structural mechanics [physics.class-ph], variabilité, [PHYS.MECA.STRU]Physics [physics]/Mechanics [physics]/Mechanics of the structures [physics.class-ph], identification, [PHYS.MECA]Physics [physics]/Mechanics [physics], [PHYS.MECA] Physics [physics]/Mechanics [physics], latent model discovery, analyse en composante principale
Abstract

Folding paper has for few decades extended beyond the origami deployable applications and tessellations to reach the engineering field. Nevertheless, mechanical information about paper fold behavior is still lacking. This communication proposes a first approach to characterize this behavior in order to be able to simulate the folding process from a mechanical point of view, and to go a step further the single kinematics of origami mechanisms. The model developed herein from simple experiments for the fold mo-notonic behavior relies on a macroscopic local hinge with a non-linear torsional spring. The influence of both the folding angle and the fold length are extracted automatically from a set of experimental values exhibiting a deterministic behavior and a variability due to the folding process., Le pliage de papier à débordé des seules applications de l'origami déployable ces dernières décades pour entrer dans le champ de l'ingénierie. Cependant, les informations sur le comportement du pli de papier sont encore parcellaires. Cette communication propose une première approche pour caractériser ce comportement, en vue de la simulation mécanique du pliage/dépliage au delà de la seule analyse cinématique de l'origami rigide. Le modèle développé ici à partir d'expériences sur le comportement monotone du pli utilise un ressort de torsion macroscopique non-linéaire réparti. Les influences de l'angle de pliage et de la longueur du pli sont extraites automatiquement d'un ensemble de données expérimentales peu structurées, en faisant apparaître à la fois un comportement déterministe et une variabilité due au procédé de pliage.

30. 3-D observation of rolling contact fatigue crack network in nitrided steels

Author

Marion Le, Fabrice VILLE, Xavier Kleber, Jean-Yves Buffiere, Jérôme Cavoret, Marie-Christine Sainte-Catherine, Laurence Briançon, Laboratoire de Mécanique des Contacts et des Structures [Villeurbanne] (LaMCoS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Matériaux, ingénierie et science [Villeurbanne] (MATEIS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Direction générale de l'armement [Bagneux] (DGA), DCNS Group [Nantes] (DCNS-Nantes), DCNS group, STLE, and Ville, Fabrice

Subjects
[SPI.MECA]Engineering Sciences [physics]/Mechanics [physics.med-ph], [SPI.MECA] Engineering Sciences [physics]/Mechanics [physics.med-ph], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

31. Rolling Contact Fatigue (RCF) in gears: Aiming for the unification of experimental procedures

Author

Pierre Rabaso, Fabrice VILLE, Moussa Diaby, Jérôme Cavoret, Vincent Baudin, Ville, Fabrice, Laboratoire de Mécanique des Contacts et des Structures [Villeurbanne] (LaMCoS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), PSA Peugeot Citroën, PSA Peugeot Citroën (PSA), Systèmes Mécaniques et Contacts (SMC), and Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Institut National des Sciences Appliquées de Lyon (INSA Lyon)

Subjects
[SPI]Engineering Sciences [physics], [SPI] Engineering Sciences [physics], ComputingMethodologies_GENERAL, ComputingMilieux_MISCELLANEOUS
Abstract

Poster; International audience

32. Influence des carbures intergranulaires induits par la nitruration sur la propagation de fissures de fatigue de contact d'acier allié pour engrenage

Author

Marion Le, Xavier Kleber, Fabrice VILLE, Jean-Yves Buffiere, Marie-Christine Sainte-Catherine, Jérôme Cavoret, Laurence Briançon, Ville, Fabrice, Service irevues, irevues, Association Française de Mécanique, Laboratoire de Mécanique des Contacts et des Structures [Villeurbanne] (LaMCoS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Matériaux, ingénierie et science [Villeurbanne] (MATEIS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Direction générale de l'armement [Bagneux] (DGA), DCNS Group [Nantes] (DCNS-Nantes), DCNS group, and CFM

Subjects
nitruration gazeuse, liserés de carbures intergranulaires, acier allié, [PHYS.MECA]Physics [physics]/Mechanics [physics], [SPI.MECA]Engineering Sciences [physics]/Mechanics [physics.med-ph], fatigue de contact avec roulement, engrenages, [PHYS.MECA] Physics [physics]/Mechanics [physics], [SPI.MECA] Engineering Sciences [physics]/Mechanics [physics.med-ph], ComputingMilieux_MISCELLANEOUS
Abstract

Colloque avec actes et comité de lecture. Internationale.; International audience; La nitruration gazeuse est une technologie utilisée par les fabricants d'engrenages pour traiter la surface des dentures dans le but d'en améliorer les propriétés mécaniques et d'augmenter la longévité des composants face, entre autre, à la fatigue de contact avec roulement. Certains aciers alliés présentent cependant des réseaux de carbures dans la couche nitrurée. Ces précipités ont la particularité de se retrouver aux joints de grain relativement parallèles à la surface, dont les coupes métallographiques perpendiculaires à la surface leur ont attribué les surnoms de « liserés de carbures » ou de « cheveux d'anges ». De plus, ils constituent des zones d'hétérogénéités à prévenir lors de la nitruration des pièces selon certains auteurs. De par le manque de travaux sur l'impact réel de ces précipités sur la fatigue, la présente étude propose des analyses de résultats d'expériences en fatigue de contact avec roulement. Des observations de réseaux de fissures en 2D et en 3D mettent en évidence l'influence des précipités sur la propagation des fissures. Ces constats permettent de mieux comprendre la divergence des comportements en fatigue de couches nitrurées de propriétés mécaniques équivalentes mais de microstructures différentes en termes de morphologies des liserés de carbures qui dépendent de la taille de grain de l'acier de base. Cela remet en question les modèles de durée de vie en fatigue ne prenant pas en compte les caractéristiques microstructurales du matériau.

33. Tribological Approach of the Contact Human Skin Synthetic Fabric

Author

Benyebka Bou-Saïd, Jérôme Cavoret, Fabrice VILLE, Bou-Saïd, Benyebka, Laboratoire de Mécanique des Contacts et des Structures [Villeurbanne] (LaMCoS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), and Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.MECA.GEME] Physics [physics]/Mechanics [physics]/Mechanical engineering [physics.class-ph], [PHYS.MECA.GEME]Physics [physics]/Mechanics [physics]/Mechanical engineering [physics.class-ph], [SPI.MECA.GEME] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanical engineering [physics.class-ph], ComputingMilieux_MISCELLANEOUS, [SPI.MECA.GEME]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanical engineering [physics.class-ph]
Abstract

International audience

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