The objective of this study is to investigate a particular type of crack problem in a layered structure consisting of a substrate, a bond coat, and an orthotropic functionally graded material coating. There is an internal crack in the orthotropic coating layer. It is parallel to the coating bond-coat interface and perpendicular to the material gradation of the coating. The position of the crack inside the coating is kept as a variable. Hence, the case of interface crack is also addressed. The top and bottom surfaces of the three layer structure are subjected to different temperatures and a two-dimensional steady-state temperature distribution develops. The case of compressively stressed coating is considered. Under this condition, buckling can occur, the crack can propagate, and the coating is prone to delamination. To predict the onset of delamination, one needs to know the fracture mechanics parameters, namely, Mode I and Mode II stress intensity factors and energy release rates. Hence, temperature distributions and fracture parameters are calculated by using finite element method and displacement correlation technique. Results of this study present the effects of boundary conditions, geometric parameters (crack length and crack position), and the type of gradation on fracture parameters.
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e-mail: boray@hacettepe.edu.tr
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September 2008
Special Issue Honoring Professor Fazil Erdogan’S Contributions To Mixed Boundary Value Problems Of Inhomogeneous And Functionally Graded Materials
Delamination of Compressively Stressed Orthotropic Functionally Graded Material Coatings Under Thermal Loading
Bora Yıldırım,
Bora Yıldırım
Mechanical Engineering Department,
e-mail: boray@hacettepe.edu.tr
Hacettepe University
, 06800 Ankara, Turkey
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Suphi Yılmaz,
Suphi Yılmaz
Aselsan Inc.
, 06172 Ankara, Turkey
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Suat Kadıoğlu
Suat Kadıoğlu
Mechanical Engineering Department,
Middle East Technical University
, 06531 Ankara, Turkey
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Bora Yıldırım
Mechanical Engineering Department,
Hacettepe University
, 06800 Ankara, Turkeye-mail: boray@hacettepe.edu.tr
Suphi Yılmaz
Aselsan Inc.
, 06172 Ankara, Turkey
Suat Kadıoğlu
Mechanical Engineering Department,
Middle East Technical University
, 06531 Ankara, TurkeyJ. Appl. Mech. Sep 2008, 75(5): 051106 (10 pages)
Published Online: July 11, 2008
Article history
Received:
May 30, 2007
Revised:
September 26, 2007
Published:
July 11, 2008
Citation
Yıldırım, B., Yılmaz, S., and Kadıoğlu, S. (July 11, 2008). "Delamination of Compressively Stressed Orthotropic Functionally Graded Material Coatings Under Thermal Loading." ASME. J. Appl. Mech. September 2008; 75(5): 051106. https://doi.org/10.1115/1.2936239
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