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In-Plane Cracking Behavior Near and Away from Interface of Thermal Barrier Coatings and Thermally Grown Oxides

Published online by Cambridge University Press:  17 March 2011

Z. Zhang ,
J. Kameda ,
A. H. Swanson  and
S. Sakurai
Z. Zhang
Affiliation:
Ames Laboratory, Iowa State University, Ames IA, USA
J. Kameda
Affiliation:
Ames Laboratory, Iowa State University, Ames IA, USA Office of Naval Research International Field Office, Tokyo, Japan
A. H. Swanson
Affiliation:
Office of Naval Research International Field Office, Tokyo, Japan
S. Sakurai
Affiliation:
Mechanical Engineering Research Laboratory, Hitachi Ltd., Hitachi, Japan
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Abstract

The initiation characteristics of in-plane cracks near and away from the interface of thermal barrier coatings (TBC) and thermally grown oxides (TGO) have been studied using a protruded four-point bend testing technique together with a finite element analysis. In-plane TBC cracks were initiated near and away from the TBC/TGO interface, respectively, in protruded specimens without and with grooved substrates. It was shown that the onset of in-plane TBC cracks near or away from the interface in the protruded TBC tests was controlled by the out-of-plane tensile stress but not by the principal tensile stress acting upon an inclined plane to the interface. The critical local tensile stress for the initiation of TBC cracks near the interface was found to be 20% lower than that away from the interface. The TBC cracking near and away from the TBC/TGO interface is discussed in light of the residual stress distribution through the TBC thickness.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 645: Symposium M – Thermal Barrier Coatings-2000 , 2000 , M9.15.1
Copyright
Copyright © Materials Research Society 2001

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References

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