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On the opening of a class of fatigue cracks due to thermo-mechanical fatigue testing of thermal barrier coatings

Hernandez, Mercedes T. and Cojocaru, Daniel and Bartsch, Marion and Karlsson, Anette M. (2011) On the opening of a class of fatigue cracks due to thermo-mechanical fatigue testing of thermal barrier coatings. Computational Materials Science, 50, pp. 2561-2572. Elsevier. DOI: 10.1016/j.commatsci.2011.03.041 ISSN 0927-0256

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Official URL: http://www.elsevier.com/locate/commatsci

Abstract

The evolution of fatigue cracks observed in thermal barrier coatings (TBCs) subjected to an accelerated test scheme is investigated via numerical simulations. The TBC system consists of a NiCoCrAlY bond coat and partially yttria stabilized zirconia top coat with a thermally grown oxide (TGO) between these two coatings. The cracks of interest evolve in the bond coat parallel and near the interface with the TGO during thermo-mechanical fatigue testing. In their final stage, the cracks lead to partial spallation of the TBC. This study focuses on why the cracks open to their characteristic shape. To this end, finite element simulations are utilized. The crack surface separation is monitored for a range of material properties and oxidation rates. The simulations show that the inelastic response of the bond coat and the oxidation rate of the TGO govern the crack surface separation. Most interestingly, permanent separation of the crack surfaces is caused by a structural ratcheting in the vicinity of the crack.

Item URL in elib:https://elib.dlr.de/71549/
Document Type:Article
Title:On the opening of a class of fatigue cracks due to thermo-mechanical fatigue testing of thermal barrier coatings
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Hernandez, Mercedes T.University of DelawareUNSPECIFIED
Cojocaru, DanielUniversity of DelawareUNSPECIFIED
Bartsch, Marionmarion.bartsch (at) dlr.deUNSPECIFIED
Karlsson, Anette M.University of DelawareUNSPECIFIED
Date:2011
Journal or Publication Title:Computational Materials Science
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:50
DOI :10.1016/j.commatsci.2011.03.041
Page Range:pp. 2561-2572
Publisher:Elsevier
ISSN:0927-0256
Status:Published
Keywords:thermal barrier coating, TBC, thermal mechanical fatigue, crack growth
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Propulsion Systems (old)
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Virtual Engine and Validation Methods (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Experimental and Numerical Methods
Deposited By: Bartsch, Dr.-Ing. Marion
Deposited On:14 Nov 2011 10:22
Last Modified:06 Sep 2019 15:24

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