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Crack-Growth Behavior in Thermal Barrier Coatings with Cyclic Thermal Exposure

Title
Crack-Growth Behavior in Thermal Barrier Coatings with Cyclic Thermal Exposure
Author
백운규
Keywords
thermal barrier coating; cyclic thermal fatigue; crack growth; initial crack length; failure
Issue Date
2019-06
Publisher
MDPI
Citation
COATINGS, v. 9, no. 6, article no. 365
Abstract
Crack-growth behavior in yttria-stabilized zirconia-based thermal barrier coatings (TBCs) is investigated through a cyclic thermal fatigue (CTF) test to understand TBCs' failure mechanisms. Initial cracks were introduced on the coatings' top surface and cross section using the micro-indentation technique. The results show that crack length in the surface-cracked TBCs grew parabolically with the number of cycles in the CTF test. Failure in the surface-cracked TBC was dependent on the initial crack length formed with different loading levels, suggesting the existence of a threshold surface crack length. For the cross section, the horizontal crack length increased in a similar manner as observed in the surface. By contrast, in the vertical direction, the crack did not grow very much with CTF testing. An analytical model is proposed to explain the experimentally-observed crack-growth behavior.
URI
https://www.mdpi.com/2079-6412/9/6/365https://repository.hanyang.ac.kr/handle/20.500.11754/151847
ISSN
2079-6412
DOI
10.3390/coatings9060365
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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