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Academic literature on the topic 'Revêtement abradable'
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Dissertations / Theses on the topic "Revêtement abradable"
Mandard, Romain Baptiste. "Dynamique de contact aube- revêtement abradable : identification expérimentale de la force et des mécanismes d'interaction." Thesis, Ecole centrale de Lille, 2015. http://www.theses.fr/2015ECLI0001.
Full textMinimizing the clearance between turbofan blades and the surrounding casing is a key factor to re-ducing leakage flows and consequently improving efficiency. The tight clearance may lead to blade-casing interactions. An abradable coating is deposited on the casing to accommodate blade incursions and thus to protect the blades and the casing from severe damage. Blade/abradable-coating interactions involve tribological and vibratory phenomena at high velocity and temperature. Experimental knowledge of these interactions is paramount to the proper design of abradable materials and the prediction of their lifetimes through numerical simulations. The purpose of this thesis is to identify experimentally the force and the mechanisms occuring during interaction between a vibrating blade and an AlSi-Polyester abradable coating. To this end, experiments were conducted on a dedicated test rig, in conditions representative of low-pressure compressor situation. Specific methods involving dynamical measurements and analytical models have been developed in order to obtain the blade/abradable-coating interacting force as well as the blade tip incursion. The influence of temperature, coating nature and blade stiffness has been studied. The interaction mechanisms and wear of the abradable coating have been investigated and correlated with the interaction conditions. This work was achieved within the framework of cooperation between Laboratoire de Mécanique de Lille (France), SAFRAN-SNECMA (France) and ONERA, the French Aerospace Lab
Baïz, Sarah. "Etude expérimentale du contact aube/abradable : contribution à la caractérisation mécanique des matériaux abradables et de leur interaction dynamique sur banc rotatif avec une aube." Phd thesis, Ecole Centrale de Lille, 2011. http://tel.archives-ouvertes.fr/tel-00605091.
Full textAgrapart, Quentin. "Bilan d’énergie au contact et contribution de la thermomécanique sur la dynamique d’interaction aube - revêtement abradable de turboréacteur aéronautique." Thesis, Lille, 2018. http://www.theses.fr/2018LIL1I033.
Full textThis thesis adresses the industrial problem of blade-tip / abradable coating interaction in aircraft engine leading to divergent dynamic response of blades. Even if it is well known that the dynamic behavior of the structure plays a key role on the divergence, wear and heating seem necessary to amplify vibratory motion leading to blade damage. In this multi-physic context the aim of this work is to provide explanations on the origins of the divergence by introducing thermomechanical phenomena. The work is divided in 2 parts. First, an energy balance at the rubbing contact is established through experimental analysis of interactions on a simplified test rig, coupled with inverse simulation models for heat flows estimation. The proposed method highlights different energy partitions between the blade and the abradable coating depending of the activation of different wear mechanisms. On the other hand, a thermomecanical strategy is developed for the simulation of blade-abradable rubbing events taking account of specific issues : different time scales between thermal and mechanical phenomena, generation and partition of heat flows at the interface, contact resolution, wear effects, thermal expansion and complex boundary conditions. Several divergent cases are investigated on the basis of comparison with experimental results available on compressor. It is shown that thermomechanical effects are sometimes overriding or conversely relegated to a more distant role, depending on the initial conditions of interaction. The competition of phenomena acting upon contact (thermal expansions, wear, etc.) is clearly demonstrated and certain aspects remain open to perspectives
Martinet, Baptiste. "Caractérisation thermomécanique et identification des endommagements d’un revêtement abradable de compresseurs basse et haute pression en condition de contact sévère." Electronic Thesis or Diss., Université de Lorraine, 2019. http://www.theses.fr/2019LORR0270.
Full textReducing gaps between blades and the casing allows an increasing of the aircraft engines effi- ciency. Moreover, blade/casing interactions, mainly due to engine vibrations, may occur. They are localized at the blade tip and may lead to the engine failure. Specific materials called « abradable materials » are used to reduce interactions impact. When an interaction occurs, the abradable ma- terial will be worn preferentialy to the blade and limits the interaction energies. Those materials are studied since many years on experimental devices to develop predictive numerical models. The purpose of this thesis is the experimental characterization of two abradable materials grades from the low-pressure compressor – the AlSi-PE grade – and from the high-pressure compressor – the CoNiCrAlY-hBN grade – on an experimental device. The experimental configuration is simpli- fied and doesn’t take in account the blade’s and casing’s dynamic phenomena. Thermomechanical characterization of two coatings was performed thanks to the correlation between forces, tem- peratures and wear mechanisms. Technological developments allowed representative tests up to 135 m/s and 720 °C. Semi-analytical modeling with Green’s techniques has been used to predict friction temperatures and heat distribution coefficients in the blade and the abradable material. Results have been correlated to an experimental test to approve the model
Vincent, Julien. "Étude expérimentale des interactions aube-abradable à très grandes vitesses : influence du matériau et de sa microstructure." Thesis, Université de Lorraine, 2015. http://www.theses.fr/2015LORR0334.
Full textThe turbofan efficiency can be improved by minimizing the blade-casing gap, thus reducing the aerodynamic loss. The reduced gap conduces to contact risk between the high-speed rotating blades and the engine case. Sacrificial materials, called abradable materials, are deposited on the casing to limit the damage caused by these contacts. These interactions involve a lot of damage mechanisms, which can be adverse or beneficial to the proper performance of the abradable seal and to the reliability of the engine. The aim of this thesis is to understand, predict and quantify the different damages and the interaction forces associated for abradable materials obtained with different process parameters. A triaxial dynamometer was developed to reproduce the local high-speed interactions (50 – 300 m/s) between the blade tip and the abradable material during transitional phases. The interaction forces measurement during short-lived contacts (300 µs – 1 ms) requires a large bandwidth. A correction method based on experimental modal analysis was implemented to extend the natural bandwidth of the device and attenuate the crosstalk between the different measurement channels. The damage mechanisms of abradable materials were studied by post-mortem analysis and correlated to the interaction forces and velocity
Al, Baida Halim. "Contribution à l'identification du comportement des matériaux à partir d'essais de micro-impact répétés." Thesis, Belfort-Montbéliard, 2015. http://www.theses.fr/2015BELF0274/document.
Full textThe behavior law is an essential element of the mechanical characterization of materials. To identify the material behavior several experimental methods can be used such as (static traction, Hopkinson bars ...) that allow to obtain mechanical laws applied under well-defined conditions, i.e. on homogeneous and bulk materials. However, do to the rising cost of these tests and their specific sample geometry, their use is limited and does not allow to probe and measure all types of materials (like coatings or porous materials....). Moreover, a broad knowledge of their properties allows a more accurate simulation of their behavior in working process. Behavior laws appropriate for bulk material do not always fit to process modeling shot peening, due to surface deformation. The main objective of this study is to develop a simple, rapid method for identifying the local behavior of materials under dynamic conditions, in order to characterize surfaces under impact loading. An inverse method has been developed to identify the behavior of materials using a combination of numerical and experimental approaches of repeated impact tests. The behavior laws obtained by the inverse method must be further investigated due to missing comparison data in literature. A comparison with an analytical method based on the theory of indentation must be carried out for more accuracy. In order to validate the efficiency of the inverse method and the analytical method, numerical blind tests wereconducted, then applications on industrial and ideal materials have been carried out to determine the limits
Delebarre, Corentin. "Etude expérimentale des systèmes d'étanchéité de type labyrinthe pour turbomachine par l'étude du contact grande vitesse." Thesis, Toulouse, INPT, 2015. http://www.theses.fr/2015INPT0130.
Full textS of turbomachinery. Especially in the secondary air sealing system, the tight clearance between the stationary and rotating parts improves control of engine seals and cooling levels between the different modules of the engines but may cause undesirable interactions between the static and rotating components. Dynamic sealing systems are composed of labyrinth seals coupled to a sacrificial abradable coating, which can accommodate interactions to preserve the global geometrical seal integrity. The objective of this thesis is to study and reproduce, through a technological high speed test rig specifically designed for the study, the labyrinth-abradable interactions applied to stainless steel/Al-Si 6% couple, under similar turbo-engine operating conditions. A suitable instrumentation is developed on the test ring to complete missing experimental data to characterize abradable labyrinth interactions. A tribological study, based on the third body concept, is proposed to identify wear mechanisms process of the Al-Si 6% coating. The influence of interaction control parameters and the seal geometry was investigated. Finally, a statistical study, based on the iconography of the correlation, is proposed to model the overall labyrinth-abradable system behavior and to identify influential parameters of the system and provide suitable criteria to monitor labyrinth seal interactions. This work was achieved within the framework of cooperation between TURBOMECA Bordes (SAFRAN Group), and the Laboratoire Génie de Production (LGP) de Tarbes
Chevrier, Boris. "Caractérisation thermomécanique des matériaux abradables projetés sur les premiers étages du compresseur haute-pression du turboréacteur : étude de l’activation des mécanismes d’endommagement." Electronic Thesis or Diss., Université de Lorraine, 2024. http://www.theses.fr/2024LORR0035.
Full textThe objective of optimizing the performance of turbojet engines is one of the cornerstones of the aviation industry's carbon-neutral approach by 2050. Reduction of the gap between the extremity of the blade (rotor) and the casing (stator) in the stages of jet engines has been considered as a major design feature by aircraft manufacturers. However, this technical solution increases the probability of severe interactions between the moving part and the static part. In order to avoid irreversible blade damage, a sacrificial abradable coating is sprayed on the inner surface of the casing. Nevertheless, particular wear phenomena are still being witnessed on the rotating and static parts which can ultimately lead to the decrease of the jet engines efficiency. Different projects have been conducted in order to reproduce these interactions in representative conditions for studying parameters which have a strong influence on activated wear modes, such as the incursion rate of the blade into the coating, the temperature or the blade tip velocity. By using the LEM3 high velocity test rig, which simulates a unique interaction between a moving abradable projectile and a fixed tool, acting as the extremity of the blade, a study has been proposed in order to thermomechanically characterize the AlSi-hBN coating (also named Metco 320). This material is considered here as a coating of reference from the few studies presented in literature. This characterization implies mainly in-situ measurements analysis and the identification of activated damage mechanisms. By considering the conclusions written on this coating of reference, a similar approach is applied on another abradable coating which could become its substitute. On the other hand, the aim is to combine the results obtained on AlSi-hBN with a thermomechanical modeling based on finite element and semi-analytical approaches. Mapping of identified damage mechanisms and definition of wear activation criteria for both coatings constitute the main work of this thesis study
Thevenot, Mael. "Contact à grande vitesse en zone labyrinthe, identification des phénomènes mécaniques et thermiques et du comportement des matériaux." Thesis, Toulouse, INPT, 2020. http://www.theses.fr/2020INPT0010.
Full textImproving the control over sealing of secondary air systems of aircraft engines require a minimum gap clearance between rotating parts and the surrounding casing, which guarantees higher engine efficiency. The tight clearance allows to reduce leakage flows but may leads to undesirable interactions between the static and rotating parts. Labyrinth seals are dynamic sealing systems for which an abradable coating is deposited on the stationary part of the seal to limit the damage of the rotating shaft. Depending on contact conditions, labyrinth-abradable interactions are potentially critical for the seal. This study aims to identify experimentally the material behaviour during these contact conditions. A high-speed contact test rig was developed to recreate contact conditions occurring in an aircraft engine. Two contact configurations involved in different locations of the engine were explored, with three thermally sprayed coatings and three honeycomb coatings, presenting different materials and surface areas. Thermomechanical characterisation is achieved with a specific instrumentation designed for the study. A tribological analysis based on the third body concept is coupled to the experimental analysis. This approach allows to identify wear mechanisms and material flows through the contact (tribological circuit), which determine the thermomechanical constraints in the high-speed contact. This work was achieved within the framework of cooperation between Safran Tech Saclay (SAFRAN group), Safran Aircraft Engines Villaroche (SAFRAN group) and the Laboratoire Génie de Production (LGP) de Tarbes
Aussavy, Delphine. "Processing characterization and modeling of thermomechanical properties of threee abradable coatings : NiCrAl-bentonite, CoNiCrAlY-BN-polyester, and YSZ-polyester." Thesis, Belfort-Montbéliard, 2016. http://www.theses.fr/2016BELF0311/document.
Full textThe objective of this work was to estimate apparent thermomechanical properties of abradable coating. Abradablematerials are strongly heterogeneous structures and the aim was to consider their detailed microstructure. Theinterest of this work is to overstep one difficulty when manufacturing abradable coating which is their dimensioning.Three abradable coatings having different nature and different microstructures have been studied. Theirmicrostructure complexity was different one from each other. Their properties were determined by a 2D modelingmethod which was applied directly pixel by pixel to take account of all the microstructural details. To validate themodeling method, the results calculated were coupled and compared to experimental ones. Two modeling methodhave been applied, a conventional one, with coating image representing coating microstructural details as well asthe global coating microstructural distribution and a 2-scale modeling method, with one scale representing themicrostructural details of the matrix and a second on representing the global coating coarse pores distribution. Onemain conclusion of this work is the following one: If the material complexity increases, the number of scalemandatory to describe the real microstructure increases. The 2-scales modeling method has been validated throughcomparison of the calculated values with those obtained experimentally. This work helps to provide a tool for digitallyselect the most promising abradable layers with the effect of reducing the number of experimental tests, which arelonger and more expensive to implement. It is a tool for decision support in the abradable coating development