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Theses

Caractérisation thermomécanique et identification des endommagements d’un revêtement abradable de compresseurs basse et haute pression en condition de contact sévère

Abstract : Reducing 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.
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https://hal.univ-lorraine.fr/tel-02556435
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Submitted on : Tuesday, April 28, 2020 - 9:40:47 AM
Last modification on : Friday, July 17, 2020 - 2:58:15 PM

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  • HAL Id : tel-02556435, version 1

Citation

Baptiste Martinet. Caractérisation thermomécanique et identification des endommagements d’un revêtement abradable de compresseurs basse et haute pression en condition de contact sévère. Matériaux. Université de Lorraine, 2019. Français. ⟨NNT : 2019LORR0270⟩. ⟨tel-02556435⟩

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