Tesis sobre el tema "Freins à disque – Propriétés thermomécaniques"
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Benseddiq, Noureddine. "Optimisation des garnitures composites pour freins à disques ferroviaires". Lille 1, 1997. http://www.theses.fr/1997LIL10076.
Texto completoSamrout, Houssam. "Loi de comportement élastoviscoplastique à température variable d'un acier de disques de frein pour matériel ferroviaire". Bordeaux 1, 1996. http://www.theses.fr/1996BOR10663.
Texto completoRapontchombo, Omanda Jessie. "Performances de garnitures frittées métalliques à basse teneur en cuivre pour les applications de freinage ferroviaire haute énergie". Thesis, Lille 1, 2019. http://www.theses.fr/2019LIL1I039/document.
Texto completoHigh energy railway brake materials are metallic matrix composite with complex and highly heterogeneous formulations. The technological choice towards this type of material for brake pads stems from the many performances that disc brake system must ensure: tribological performances (friction coefficient, wear), thermomechanical performances (integrity in temperature), acoustic performances (squeal). New international environmental standards, lead to evolutions of pad formulations, consisting of reduce copper content. Because of complexity of the formulations, the developments are empirical. It is proposed in this work to develop methodologies that improve the understanding of the link between the formulation of friction materials and their braking performances. The first part of the works consists of microstructural characterizations of the materials on new materials and after braking solicitations showing significant evolutions. The characterizations are coupled with measurements of the thermophysical properties. The second part of the study concerns reduced scale tests that achieve similar solicitations to full scale performance braking tests. Reduced scale samples simplify tribological analysis. The last part of the work focuses on vibroacoustic aspects by studying squeal tendency of a simplified system that highlight the role of the tribological circuit. In addition to these methodological contributions, the study shows the impact of the development axes of the new formulations. Explanations are given on the links between the formulation, properties and performances: thermomechanical, vibroacoustic and tribological. As the proposed methodologies, they must allow to improve prospective material developments
Dufrénoy, Philippe. "Étude du comportement thermomécanique des disques de freins vis-à-vis des risques de défaillance : application au domaine ferroviaire". Lille 1, 1995. http://www.theses.fr/1995LIL10181.
Texto completoWicker, Paul. "Influence des garnitures de frein sur les sollicitations thermiques des disques TGV et conséquences sur les risques de fissuration". Phd thesis, Ecole Centrale de Lille, 2009. http://tel.archives-ouvertes.fr/tel-00579663.
Texto completoStrubel, Nicolas. "Brake squeal : identification and influence of frictional contact localizations". Electronic Thesis or Diss., Université de Lille (2022-....), 2023. http://www.theses.fr/2023ULILN059.
Texto completoAs intense acoustic radiations implying consequent environmental nuisances and customer complaints, squeal noises in brake systems are friction-induced vibration issues indubitably depending on multiphysics and multiscales problematics. Among these latter, system structure, braking operational parameters, frictional contact interfaces, coupled to temperature dependency, as well as contact non-linearities or tribological aspects, are elements considerably affecting squeal, making from this unpleasant noise a complex problem to apprehend. In this work, the full scale system is considered, and several principal tendencies are identified regarding the influence of contact localizations on acoustic emissions.NVH tests are conducted, this analysis involves several scales of interest aiming at changing contact characteristics: pads are modified either at the macroscopic scale -with the will of implicitly varying load bearing areas-, or at the mesoscopic one -tending to impact evolution of the tribological circuit-. The inherent purpose is to identify pads parameters influencing squeal, by affecting tribolayer as well as engaging noise signature differences between conducted experiments.Heavily instrumented tests are realized on a full scale brake system, focusing on different pad shapes: the development of an enriched instrumentation through in-operando thermal surface tracking allows to access to supplementary solicitation informations, permitting to follow the assumed load bearing area. The employment of clustering methods is considered to manage the analysis of thermal datas.Experimental / numerical correlated stability simulations are conducted. Subsequent analyses are realized, by investigating pads chamfer characteristic impact on squeal, influence of coefficient of friction, or implementation of global pads wear shapes. Furthermore, thermomechanical simulations are of interest, and the introduction of previously clustered-defined contact areas into models is realized.Although the full brake system consideration can involve severe experimental dispersions, initial correlations between modified pads at different scales -via pad shapes for the macroscopic one, and thermal treatments of friction material focusing on the mesoscopic level- and noise characteristics are observed. Enriched instrumented tests lead to the conclusion that contact localizations can evolve during NVH tests, depending on solicitation variables. A particular link between braking operational parameters (pressure, temperature), contact localizations, and squeal features is established through clustering. Finally, observed simulated tendencies tend to follow experimental ones, and model enrichment via a more accurate contact description could present improvements regarding squeal prediction capability of such simulation
Sansen, Pascal. "Formulation énergétique d'un critère de rupture locale d'un solide en thermoplasticité". Lille 1, 1999. https://pepite-depot.univ-lille.fr/LIBRE/Th_Num/1999/50376-1999-81.pdf.
Texto completoDemarecaux, Philippe. "Adhérence et propriétés tribologiques de revêtements obtenus par projection thermique hypersonique : applicabilité des revêtements de carbures de chrome aux disques de freins". Lille 1, 1995. http://www.theses.fr/1995LIL10030.
Texto completoBouache, Toufik. "Comportement thermique et caractérisation des échanges interfaciaux d’un frein à disque par approches théorique et expérimentale". Paris 10, 2006. http://www.theses.fr/2006PA100122.
Texto completoThe work developed in this thesis contributes to the knowledge of the thermal behaviour of a disc–brake system. The problem is studied from three different approaches: analytical, numerical and experimental. An analytical solution has been developed to determine the 3D steady temperature distribution in the disc. Three-dimensional numerical simulations of the transient state have also been performed. The results enable us to analyze the evolution of temperatures and to deduce from them the thermal gradients. These gradients are fundamental for the study of the thermomechanical behaviour of the system (constraints, deformations, effectiveness and wear). Two inverse models are developed to determine the temperatures and the contact parameters at disc-brake pad interface (local heat partition coefficient and thermal contact resistance). Measurements by thermocouples were taken using an experimental device mounted on a lathe. The experimental results are then used for the procedure of contact parameters estimation
Brunel, Florent. "Étude thermomécanique du couple roue-semelle ferroviaire sous sollicitations de freinage". Lille 1, 2007. https://pepite-depot.univ-lille.fr/LIBRE/Th_Num/2007/50376-2007-77.pdf.
Texto completoUne seconde modélisation est proposée permettant la prise en compte de la géométrie 3D de la semelle. L'originalité se situe dans la résolution thermique transitoire de la roue, basée sur un suivi temporel d'une section de roue suivie d'une reconstitution 3D. Les résultats permettent la prédiction des localisations sur toute la surface de frottement. L'utilisation conjointe de ces modèles permet de répondre à l'objectif de prédiction des gradients thermiques et de mise à disposition de moyens d'optimisation de la semelle. Pour le second objectif de prédiction de l'évolution des contraintes résiduelles dans les roues, la détermination de l'état initial, issu du traitement thermique, est nécessaire. Elle est réalisée à l'aide d'un modèle thermomécanique 2D axisymétrique. Le coefficient d'échange thermique, lors de la trempe, a été identifié sur un dispositif expérimental développé spécifiquement. Différentes simulations ont pu montrer l'importance du modèle de comportement du matériau de la roue sur la distribution des contraintes résiduelles, notamment la prise en compte des phénomènes visqueux. Les résultats indiquent une bonne prédiction de l'évolution des contraintes résiduelles, de compression après le traitement thermique puis leur passage en traction après freinages, en conformité avec les relevés expérimentaux. Des compléments sont en cours pour une meilleure identification du modèle de comportement du matériau de la roue
Tigane, Rafik. "Caractérisation des phénomènes de stiction d’un couple disque/garniture de friction". Thesis, Sorbonne université, 2021. https://tel.archives-ouvertes.fr/tel-03789653.
Texto completoThe phenomenon of stiction occurs at the pad-brake disc interface by the adhesion of the pad to the disc when the parking brake is applied long enough. The mechanisms behind this phenomenon are, to date, largely unexplained. However, from observations made on surfaces of disc-pad pairs having undergone a stiction, the hypothesis according to which the corrosion products of the disc, by becoming encrusted in the pores of the friction material, would be at the origin of this phenomenon, was privileged. The work of this thesis focused on understanding the phenomenon of stiction by focusing on three components which are: (a) the characterization of the electrochemical behavior of various disc-pad couples using measurements to monitor the corrosion potential, electrochemical impedance spectroscopy and voltammetry, (b) the mechanistic study of corrosion phenomena at the disc-pad interface and (c) the study of the pressure effect on corrosion phenomena of the disc-pad couple. The study without a clamping force allowed us, to demonstrate an exacerbated reactivity of the disc in the presence of the pad and to establish a selection criterion for the disc-pad torque. Monitoring the movement of the pad during electrochemical measurements with a clamping force revealed that corrosion products, accumulating at the disc-pad interface, exerted a force on the pad, confirming the hypothesis put forward during this thesis to explain the phenomenon of stiction
Majcherczak, Didier. "Étude thermique d'un contact glissant : approche numérique et expérimentale : application au freinage". Lille 1, 2003. https://pepite-depot.univ-lille.fr/LIBRE/Th_Num/2003/50376-2003-169-170.pdf.
Texto completoMann, Ruddy. "Experiments and thermomechanical modelling of braking application & friction material characterization with loading history effect". Thesis, Lille 1, 2017. http://www.theses.fr/2017LIL10016.
Texto completoThe railway high speed sector is currently expanding with an increase of the maximum operating speed and load leading to the necessity of improving the capacity of the disc braking to ensure performances despite the additional energy to dissipate. The current methodology used for the development of these material is based on trial-error experimental feedback. The goal is to develop alternative methodologies, with theoretical and numerical models for designing these components. Difficulties are the complex interactions between tribological, thermal, mechanical, chemical effects and interactions between scales from the surface to the system. This work is focused on the thermomechanical aspects with the challenge of developing a realistic numerical model and considering the material evolution assuming that this evolution affects the braking performances. In the first step, an original methodology has been developed to characterize the friction material submitted to realistic solicitations and allowing identifying bulk material behavior. Characterization has been done for different braking loading histories. Corresponding thermo-elastic-plastic behavior models have been proposed. The second step of this work is the development of a finite element model of the brake system, including the sintered material models previously identified and the evolution with loading history. The numerical results illustrate the impact of the friction material evolution regarding the braking performances. They are also compared to experimental tests carried out on a real scale braking bench
Waddad, Yassine. "Multiscale thermomechanical strategies for rough contact modeling : application to braking systems". Thesis, Lille 1, 2017. http://www.theses.fr/2017LIL10049/document.
Texto completoContact phenomena (roughness, friction, wear, etc.) are central to friction brake functioning as they lead to the modification of surface and material properties which may affect the braking performances. To address these issues, the manufacturers use an experimental approach based on feedback tests which is expensive and inefficient against the current requirements.The objective of this work is to propose an alternative based on numerical modeling of applications like brakes with realistic assumptions at the contact interface level, unlike the classical approaches that assume a perfect contact. This challenge has been overcome by building a numerical methodology associating a large scale model of the system and several micro scale models of contact phenomena. The micro scale contact modeling has been performed with thermal and mechanical models considering roughness. The problem is solved by means of constrained quadratic programming. A normal gradient of material properties and wear have also been considered. From this analysis, surface parameters (pressure, temperature,etc.) are analyzed depending on roughness and material properties. Thereafter, a Finite Element large scale model is embedded with these parameters while the surface is flat at this scale. With this technique, the CPU time is considerably reduced and the precision is maintained in comparison to classical Finite Element calculations. This multi-scale methodology has been used for dynamic and thermo-mechanical analyses of braking systems. The results of numerical simulations highlight the impact of the contact interface and its evolution on the system behavior, and vice versa
Hentati, Nesrine. "Matériaux composites à matrice organique pour garnitures de frein : analyse des liens entre le procédé d’élaboration, la microstructure, les propriétés et le comportement tribologique : analyse des liens entre le procédé d’élaboration, la microstructure, les propriétés et le comportement tribologique". Thesis, Ecole centrale de Lille, 2014. http://www.theses.fr/2014ECLI0012/document.
Texto completoOrganic composite friction materials for brake lining result from a complex elaboration made up of successive stages (mixture of constituents, cold preforming, hot molding, post-curing) that makes difficult the mastery of the link between process, properties and behaviour of friction material, especially because of synergies between constituents on one hand, and between composition and manufacturing process on the other hand. Two manufacturing stages were involved in this study, the hot molding and the post-curing, with the aim of a better understanding of the influence of certain parameters of the manufacturing process: the temperature and the duration of hot molding, and the duration of post curing. The analysis has focused on the understanding the relationship between microstructure, properties, tribological behaviour and friction and wear mechanisms of materials.The experimental approach was based on the development of simplified formulations of friction material, and on an elementary wear test specifically designed for braking loadings