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Abstract
TBC (Thermal Barrier Coatings) mostly find application in the combustion sections of aircraft turbine engines. With the demand for fuel economy and increased power, combustion temperatures are approaching the design limits of the metal alloys from which hot end components are made. Modern TBCs are required to not only limit heat transfer through the coating but to also protect engine components from oxidation and hot corrosion. When a TBC fails, it exposes the underlying substrate to very high gas temperatures and the life of the component gets reduce drastically. With a failed TBC, a component can even fail within its prescribed service life. This is an airworthiness issue. So it is essential to estimate the TBC life accurate possibly to ensure airworthiness of the aircraft at any given time. Premature failure are observed in the TBC applied over combustion section of a turboprop engine. The engine is 800 shp class and it powers a commuter aircraft. The objective of this paper is to find out mean life of the coating by life data analysis. The data has been fitted to Weibull distribution. The Weibull parameters have been discussed which highlights the dominating cause for TBC failure and hence suggestion for life improvement of TBC system has also been made. The need for TBC system redesign has been emphasized. In addition to this, it also presents a comparison between different users/ operators.
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References
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References
Kang, B. S. -J., Feng, C., Tannenbaum, M. and Alvin, M. A., "A Load-based Depth-sensing Indentation Technique for Damage Assessment of Thermal Barrier Coatings", Proceedings of ASME Turbo Expo 2009: Power for Land, Sea and Air, GT2009-59985, 8-12 June, 2009, Orlando, Florida, USA.
Madhavrao Govindaraju, et al., "Development of Life Prediction Methodology for Thermal Barrier Coatings based on Nondestructive Piezo-spectroscopy Photoluminescence Measurements", Proceedings of ASME Turbo Expo 2009: Power for Land, Sea and Air, GT2009-59570, 8-12 June, 2009, Orlando, Florida, USA.
Gas Turbine Combustors, A. H. Lefebvre, Second Edition.
Evans, A. G., He, M. Y. and Hutchinson, J. W., "Mechanics-based Scaling Laws for the Durability of
Thermal Barrier Coatings", Progress in Materials Science, 46, pp.249-271, 2001.
Mats Eskner., "Mechanical Behaviour of Gas Turbine Coatings", ISBN 91-7283-786-1, 2004.
Reliasoft Weibull++7 Software Operating Manual.
System Software Reliability, Hoang Pham, ISBN10:1852339500
Ragupathy, R., Sakthivel, A., Ramesha, H.P. and Gouda, G., "Analysis of In-service Failure Data for
Continued Airworthiness Assurance - Case Studies", Globalization Of Engineering, Design, R&D Challenges and Opportunities, 9-11 August, 2007, Indian Institute of Science, Bangalore.
A Handbook of Statistical Analysis Using SAS, Geoff Den, Brian Everitt, ISBN-1-58488-245X