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Добірка наукової літератури з теми "Véhicules – Freins à disque – Propriétés thermomécaniques"
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Дисертації з теми "Véhicules – Freins à disque – Propriétés thermomécaniques"
Bruant, Valentin. "Modélisation transitoire des mécanismes de localisations thermomécaniques macroscopiques dans un contact frottant : application aux freins à disque." Electronic Thesis or Diss., Université de Lille (2022-....), 2024. http://www.theses.fr/2024ULILN040.
Повний текст джерелаObservations on brake disc reveal, generally under severe loading, that thermal localisations may occur on the disc surface. Such circumferential macroscopic localisations (hot spots) limit contact areas due to out-of-plane deformation caused by thermal expansion. The consequences are critical, as they increase the risks of cracking or low-frequency vibrations which can propagate throughout the vehicle.Several theories attempt to explain the formation of hot spots : stable thermomechanical mechanisms linked to non-uniform diffusion of heat (in case of ventilated brake disc) or instable thermomechanical instabilities (TEI), where the solution comes from studying the propagation rate of a sinusoidal perturbation in the contact pressure or temperature as function of the sliding speed. Another recently suggest approach shows that an initial deformation may evolve, under thermo-elasto-plastic stress, into a higher number of localisations (PWD : Progressive Waviness Deformation).Modelling thermal localisations remains challenging due to the multiphysic and multi-scale mechanisms encounter in frictional brakes. It requires thermal and thermomechanical solution that account nonlinear material behaviour and contact friction.The methodology of this work is based on finite element transient thermomechanical simulations and consider the importance to confront existing approaches and quantify out-of-plane deformations. In addition, numerous parameters must be considered, such as geometrical parameters or thermomechanical constrains, which experiments have proven to be factors of apparition of hot spots.The development proposed here first highlights the mechanisms involved in driving thermal localisations, by illustrating step by step the thermoelastic instabilities. The transient approach proposed here is then described and compared with analytical models from the literature (TEI) in terms of limit of stability. This approach allowed the study of several parameter and the explanation of some experimental observations. Finally, a detailed analyses of results enable a comparison between approaches from the literature, showing agreement in terms of final deformations (number of localisations) but with different thresholds. The importance of detailed modelling of the system (geometry, boundary conditions, initial conditions) is also emphasized
Benseddiq, Noureddine. "Optimisation des garnitures composites pour freins à disques ferroviaires." Lille 1, 1997. http://www.theses.fr/1997LIL10076.
Повний текст джерелаSamrout, 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.
Повний текст джерелаRapontchombo, 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.
Повний текст джерелаHigh 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
Strubel, Nicolas. "Brake squeal : identification and influence of frictional contact localizations." Electronic Thesis or Diss., Université de Lille (2022-....), 2023. http://www.theses.fr/2023ULILN059.
Повний текст джерелаAs 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
Wicker, 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.
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