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Characterization of Crack Propagation along Bond Coat/Topcoat Interface of a TBC System

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Abstract:

The crack propagation along the bond coat / topcoat interface of a TBC system has been studied in a previous work under a certain mode ratio (K2/K1). In order to discuss a parameter that describes the crack propagation, the growth behavior of a crack has to be studied under various K2/K1 ratios. In this work, BEM was used to determine the modifications that change K2/K1 ratios of the specimen employed in the previous study. Six characteristics of the specimen were modified: location of the applied load; height; length, position and direction of the notch, and its separation from the bond coat / topcoat interface. Among these modifications, the change of location of load point can effectively change K2/K1 ratio to values greater and smaller than those of the previous study. Crack propagation tests with three different positions of load point were performed using specimens with topcoat porosity of 5%, 15% and 20%. The results indicated that, independently of K2/K1 ratio, the parameter Ki dominated the crack growth behavior for an interface crack under mixed mode.

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Periodical:

Key Engineering Materials (Volumes 261-263)

Pages:

441-446

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.261-263.441

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Online since:

April 2004

Authors:

B. Gomez, Yukio Miyashita, Yoshiharu Mutoh, M. Takahashi

Keywords:

Ceramic Coating, Crack Propagation, Interface Crack, Thermal Barrier Coating (TBC)

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© 2004 Trans Tech Publications Ltd. All Rights Reserved

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References

[1] S. Amagasa, K. Shimomura et al., J. Engng. Gas Turb. Pow., 116 (1984) p.597.

Google Scholar

[2] I. Yuri, T. Hisamatsu, K. Watanabe and Y. Etori, J. Engng. Gas Turb. Pow., 119 (1997) p.506.

Google Scholar

[3] Y. Mutoh et al., JSME/ASME Conf. on Mat. and Proc., Honolulu (2002) p.107.

Google Scholar

[4] Yuuki R., Mechanics of Interface, Baifukan Tokyo (1992).

Google Scholar

[5] Yuuki R. and Xu J.Q., Seisankenkyu, 43-7 (1991) p.306.

Google Scholar

[6] J. R. Rice, J. Appl. Mech., 55 (1988) p.98.

Google Scholar

[7] R. Yuuki and J. Q. Xu, Eng. Fract. Mech., 41-5 (1992) p.635.

Google Scholar

[8] Erdogan F. and Jin G.C., J. of Basic Engineering, Dec, (1963) p.519.

Google Scholar

[9] Katoh, H., Characterization of the crack propagation behavior along the interface of a thermal barrier coating, Master thesis, Nagaoka University of Technology (2001).

Google Scholar