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1142 |
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Numerical simulation of the thermomechanical behavior of thermally sprayed abradable coatings |
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Jean-Louis Seichepine* / LERMPS - UTBM, France Houda Faraoun / LERMPS, University of Technology of Belfort-Montbeliard, France François Peyraut/ M3M, University of Technology of Belfort-Montbeliard, France Christian Coddet/ LERMPS, University of Technology of Belfort-Montbeliard, France Peter Chandler/ LERMPS, University of Technology of Belfort-Montbeliard, France Dieter Sporer/ Sulzer Metco (Canada) Inc , Canada Manuel Hertter/ MTU Aero Engines, Germany Christopher Sellars/ Rolls-Royce plc , United Kingdom |
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The newly designed abradable coatings are usually validated by rig tests, where samples are rubbed by the contact of a dummy blade with given running speed and incursion rate, simulating actual working conditions in an aircraft engine. The aim of this work was to develop a model of abradable coating rig tests, allowing extensive studies on the influence of coating properties and test conditions on the thermal behavior of the system. The proposed model includes several steps implementing different numerical tools. The starting point of the modelling process is metallography. An image analysis route has been implemented to achieve a relevant structural description of an abradable coating. This method can also be used to describe a prospective material before its manufacturing. FE calculations based on this description allow then to estimate the coefficients of an anisotropic elastic law of behaviour. Furthermore a plasticity law is deduced from a FE simulation of the material HR15Y hardness. These parameters are used as input of a FE simulation of a single blade-to-coating rubbing hit, resulting in calculated stresses and temperatures. Finally a global approach of the complete abradability test has been implemented, based on the results obtained from the simulation of a single hit and on various assumptions. It allows to take account of the cooling phases between the hits. The influence of the rig environment can also be considered. The results are predictions of the blade and coating temperature variations versus time during a complete abradability test. This study was funded by the European Commission under the FP5 Growth Program. |