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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


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
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Hernandez, Mercedes T.University of DelawareUNSPECIFIEDUNSPECIFIED
Cojocaru, DanielUniversity of DelawareUNSPECIFIEDUNSPECIFIED
Karlsson, Anette M.University of DelawareUNSPECIFIEDUNSPECIFIED
Journal or Publication Title:Computational Materials Science
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 2561-2572
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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