NDLI: Interfacial Fracture Analysis in EB-PVD/PTAL TBC Systems

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Ma, Q. Beuth, J. L. Meier, G. H. Pettit, F. S.
Copyright Year	2009
Abstract	Thermal barrier coatings (TBCs) have been utilized for more than four decades to increase the efficiency and durability of aircraft engines as well as land based gas turbines. Though the function of the thin TBC layer is heat insulation, it is critically important for it to maintain adherence in service. In this paper, we address some fundamental aspects of TBC debonding failure in electron beam physical vapor deposition (EB-PVD) TBC systems that had been considered in a previous study. We demonstrate that the energy release rate formulation for EB-PVD TBC systems based on as-processed conditions and a thin thermally grown oxide (TGO) layer overestimates the energy release rate for exposed TBC systems having thicker TGO layers. A modified formulation is given, applicable to exposed TBC systems. A finite element contact and fracture model is used to validate the formulation as well as study crack mode mixity. Mode II interfacial cracking is shown to be dominant for practical TGO thicknesses seen in exposed EB-PVD TBC systems.
Starting Page	341
Ending Page	350
Page Count	10
File Format	PDF
ISBN	9780791843871
DOI	10.1115/IMECE2009-11706
e-ISBN	9780791838631
Volume Number	Volume 14: Processing and Engineering Applications of Novel Materials
Conference Proceedings	ASME 2009 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2009-11-13
Publisher Place	Lake Buena Vista, Florida, USA
Access Restriction	Subscribed
Subject Keyword	Insulation Durability Fracture (materials) Aircraft engines Cathode ray oscilloscopes Fracture (process) Heat Vapor deposition Electron beams Gas turbines Thermal barrier coatings Finite element analysis Failure
Content Type	Text
Resource Type	Article

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