Paper Title:
Characterization of Crack Propagation along Bond Coat/Topcoat Interface of a TBC System
  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.

  Info
Periodical
Key Engineering Materials (Volumes 261-263)
Edited by
Kikuo Kishimoto, Masanori Kikuchi, Tetsuo Shoji and Masumi Saka
Pages
441-446
DOI
10.4028/www.scientific.net/KEM.261-263.441
Citation
B. Gomez, Y. Miyashita, Y. Mutoh, M. Takahashi, "Characterization of Crack Propagation along Bond Coat/Topcoat Interface of a TBC System", Key Engineering Materials, Vols. 261-263, pp. 441-446, 2004
Online since
April 2004
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Price
$32.00
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