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Academic literature on the topic 'Polymères – Tribologie (technologie)'
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Dissertations / Theses on the topic "Polymères – Tribologie (technologie)"
Maheu, Pierre. "Contribution à l'étude du comportement tribologique de revêtements polymères chargés présentant des propriétés d'antiadhérence ou d'antiadhésion." Besançon, 2000. http://www.theses.fr/2000BESA2036.
Full textHan, Adelina-Alina. "Comportement tribologique des surfaces de polymères traitées par laser." Dijon, 2005. http://www.theses.fr/2005DIJOS038.
Full textTaking into account the remarkable results obtained by using laser beam for improving the tribological behaviour of metals, the thesis propose an extension of this procedure to the plastic materials. In order to obtain this propose a surface treatment was carried out by means of a CO2 laser, consisting of parallel grooves. The study of the laser patterns influence on the tribological behaviour of the contact couple cylinder (steel) – plane (polycarbonate) was highlighted using a fretting approach. The running fretting maps plotting was rapidly achieved with an innovative statistical method, by designing and applying several complete factorial experiments for fretting tests
Casoli, Alain. "Mécanismes moléculaires de la friction à une interface contrôlée : effet de chaînes polymères greffées ou adsorbées." Mulhouse, 1999. http://www.theses.fr/1999MULH0556.
Full textKlein, Guillaume. "Propriétés tribologiques de films issus de latex acryliques nanocomposites." Strasbourg, 2010. http://www.theses.fr/2011STRA6067.
Full textAmong the applications of colloidal aqueous polymers, coatings are predominant. In this specialty, an understanding of mechanical properties, especially tribological, is essential. The general problematic of this thesis is to improve the understanding of the tribological behavior of films from latex subjected to the friction of a steel bead. Two types of distinct acrylic latex systems emerge from this thesis. Firstly, model systems, where we varied some relevant physical-chemical parameters that may influence particular latex film morphology (composition, pH, amount of surfactant post-added) and on the other hand, nanocomposites systems where a structure heterogeneity was introduced (clay or cerium oxide). Tests were performed on thin film using a tribometer equipped with a camera to visualize the in situ geometry of the contact area on the transparent latex films. It was shown that the glass transition is clearly visible by a friction peak after obtaining master curves. The position of this peak of dissipation was compared to the peak of loss factor, obtained through dynamic mechanical thermal analysis, which leads to discuss the relevance of the characteristic length of strain rate in friction. From a physico-chemical point of view, latex synthesis, post-synthesis parameter and structure of films can be directly correlated to tribological properties
Galuschko, André. "Molecular dynamics simulations of sheared polymer brushes." Strasbourg, 2010. https://publication-theses.unistra.fr/public/theses_doctorat/2010/GALUSCHKO_Andre_2010.pdf.
Full textMalroux, Maryline. "Mécanismes d'action tribologique des films secs en emboutissage." Ecully, Ecole centrale de Lyon, 2001. http://bibli.ec-lyon.fr/exl-doc/TH_T1877_mmalroux.pdf.
Full textContinuous improving of the drawability of its steels is part of the USINOR research. The reduction of friction coefficient under the blank holder by the use of organic coatings (polymer films or wax) on steel sheet is one possible way of progress. This study aims to have a better understanding of the mechanisms of the tribological action of organic coatings in deep drawing. The substrate used for the study is a zinc-coated sheet. First, we have chosen model systems (a polyethylene, a grafted polyethylene, an acrylic resin and a vegetal wax) in order to evaluate their tribological properties (friction tests on a flat on flat tribometer and cup tests). Different friction mechanisms have been underlined : shearing at the interface zinc/polymer (flattening of substrate asperities and important amount of zinc and polymer transfer on the tools), shearing in the polymer with or without formation of rolls and sliding at the interface indenter/polymer. These two last mechanisms provide many advantages in deep drawing : protection of the surfaces and reduced pollution of the tools. Temperature tests on a pin on flat tribometer have been carried out to explain these mechanisms. The parameters - glass transition temperature, melting temperature, polarity (that is to say the capabilty of the polymer to form a transfer film with a good adhesion on the counterface) and ductile-brittle transition temperature - have been considered to explain the observed behaviours
Dorenge, Justine. "Etude du comportement d'additifs polymères épaississants dans les huiles moteur." Thesis, Le Mans, 2018. http://www.theses.fr/2018LEMA1012.
Full textThe reduction of car fuel consumption is one of the biggest concerns for oil companies. It involves the reduction of friction between moving parts through the formulation of lubricants.A lubricant is composed of base oil and several additives used to improve the properties of engine oils. Polymeric compounds are used to limit the decrease of viscosity with temperatures to efficiently protect the motor. This type of additives, called Viscosity Index Improver (VII), is based on the swelling of polymer chains with temperature. The most important parameter in the lubricant formulation is the viscosity and its dependance on temperature. The aim of the work was to study the influence of recently developed families of VII additives in different base oils in ordrer to select the most efficient type of polymer for engine lubricant uses, by understanding the molecular mechanisms responsible of the VII behavior. Various polyalkylmethacrylates were investigated to establishing the rheological properties of the solutions, namely as a function of temperature (dependence of intrinsic viscosity). For a given base oil, the efficiency of a VII varies with its chemical structure, its molecular weight and its concentration. Then, tribological properties were investigated using standard tests with the aim to obtain an overview of the lubricant's behavior under pressure. We also considered the degradation of this kind of polymers in a representative test in order to check the performance's durability. Degradation and tribological behaviors were rationalized in terms of volume occupied by polymer chains
Kechaou, Borhane. "Corrélation entre propriétés diélectriques et mécaniques de composites à matrice époxyde renforcée par des fibres de verres E." Ecully, Ecole centrale de Lyon, 2003. http://bibli.ec-lyon.fr/exl-doc/bkechaou.pdf.
Full textTwo unidirectional glass fiber reinforced polymers composite materials, being different only by the nature of the fiber/matrix interface (sizing), were studied. The approach is based on the fact that any stress, whatever its nature (electric, mechanical, radiative, thermal. . . ), applied to a dielectric material led to an injection of electric charges. These charges can diffuse or be trapped. To simulate these phenomena, the "mirror method" (Scanning Electron Microscopy Mirror Effect SEMME) were used. It is shown that the fiber/matrix interfaces impose a greater instability of the charges, with a double role of motion but also of trapping of the charges along the interface. A composite which has a sizing allowing the diffusion, therefore limiting the localization of the polarization energy, is consequently preferable from the mechanical or tribological point of view
Fu, Li. "Rhéologie des polymères dans les contacts confinés : tribologie des interfaces étudiées par un nouveau dispositif couplant FRAPP et nanotribologie." Thesis, Strasbourg, 2015. http://www.theses.fr/2015STRAE030/document.
Full textThis work deals with the development of a new experimental technique and its application to study the rheology of a highly confined and sheared interfacial zone involved in the sliding of a rigid tip on a polymer suface. This tribological work has been conducted gradually from the mesoscopic scale to the nanoscale.To highlight the behavior of the cohesive zone, we studied an interpenetrating polymer network system (INPs) CR39-PMMA. Thanks to their adjustable properties, we may use the INPs as a substrate to study the interfacial zone by easily varying the rheological parameters.To study the rheological properties in the interfacial zone, the phospholipid layers of DSPC have been chosen as model material. The structures have been studied by the neutron reflectivity experiments. We show that the structure of supported layers of DSPC is robust, and the relative humidity plays a key role on it. Sliding tests on the DSPC layers reveals the influences of mechanical and environmental parameters on the shear stress. The development of NanoTribo-FRAPP allows to characterize the shear conditions of DSPC layers, with the measurements of local velocity of these of nanoscale molecular layers. This gives us access to estimate the slip planes as a function of imposed velocity
Bulthé, Anne-Lise. "Caractérisation expérimentale du contact frottant disque garniture sous sollicitations sévères de freinage : Prise en compte des interactions tribologie, thermique et physico-chimie." Ecole Centrale de Lille, 2006. https://pepite-depot.univ-lille.fr/LIBRE/Th_Num/2006/50376-2006-Bulthe.pdf.
Full textThis study deals with the behaviour of a pad on disc rubbing contact under severe braking loadings. Those conditions are observed in railway application during an emergency stop braking or a succession of stop brakings with heat accumulation. The chosen multiphysical approach takes account of the interactions between tribology, heat science and physical chemistry. The work is presented in 4 parts. The first presents the characterization of the studied materials (an organic matrix composite and a grey cast iron) and the experimental devices used. The second deals with the degradation of the organic matrix composite with temperature and its influence on the tribological behaviour of the studied materials as well as on the physical mechanisms activated in the contact. The third concerns the behaviour of the pad on disc rubbing contact under the two types of severe braking loadings. The evolutions of the friction coefficient are correlated with the thermal localisation observed with an infrared camera and with the physical mechanisms identified by friction surfaces observations and analysis performed after the braking. The fourth sets out the study of the evolution of the friction physical mechanisms activated during the high-energy stop braking and their interactions with the local and transient thermal phenomena observed at the surface. Friction surfaces are observed and analysed after interrupted stop brakings performed before stop at typical steps of the braking. In-situ observations of the friction disc track are also performed using a video camera to corroborate the results obtained by post-mortem observations