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Status of available testing methods and standardization

Scholz, Alfred and Schütze, Michael and Bartsch, Marion and Vaßen, Robert (2009) Status of available testing methods and standardization. In: Proceedings of the Second German-Japanes Workshop on Thermal Barrier Coating Systemes for Gas Turbines, USB-Paper D1-2. Second German-Japanes Workshop on Thermal Barrier Coating Systemes for Gas Turbines, Kyoto, Japan.

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Investigations of damage evolution and life prediction methodologies of thermal barrier coating (TBC-) systems pose a current challenge. In order to determine properties of TBC system components (bond coat, thermal grown oxide layer (TGO) and ceramic top coat) testing methods have been developed following the strategy to identify mechnical and phyiscal properties prior to lifing studies. Testing methods comprise experiments for • individual components of TBC systems and • TBC systems without/with TGO layer. The simulation of complex loading and damage evolution requires data e.g. for elastic plastic (time independent) behaviour and time dependent (creep) behaviour of bond coat as well as TGO layer. Further adhesion experiments distinguish between global experiments and local experiments. Hardness test is of interest with respect to getting local data of top coat. Further crack propagation experiments lead to e.g. energy release rate, which can directly feed in a life prediction model. Herefrom the problem arises that properties may depend on specimen design. In addition, morphology of individual TBC system components cause problems at the generation of data and their interpretation. Consequently, efforts are necessary to harmonise • specimen geometry • testing methods and • assessment procedures. The purpose of this presenation deals with the aim to give an overview about typical testing methodologies and corresponding specimen design. The harmonisation of testing practices followed by a standard is a future challenge of interest for research as well as for industry as the end user of components operating with TBC systems. Among all existing test methods the thermocyclic exposure test as an unsophisticated and widely used test in industry is presently in the ISO standardization procedure. The talk will dwell on this test and the present standardization situation to a significant extent.

Item URL in elib:https://elib.dlr.de/61354/
Document Type:Conference or Workshop Item (Speech, Paper)
Title:Status of available testing methods and standardization
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Date:29 May 2009
Journal or Publication Title:Proceedings of the Second German-Japanes Workshop on Thermal Barrier Coating Systemes for Gas Turbines
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Volume:USB-Paper D1-2
EditorsEmailEditor's ORCID iDORCID Put Code
Okazaki, MasakazuNagaoka University of TechnologyUNSPECIFIEDUNSPECIFIED
Keywords:Thermal Barrier Coating systems, specimen design, testing methods, standardization
Event Title:Second German-Japanes Workshop on Thermal Barrier Coating Systemes for Gas Turbines
Event Location:Kyoto, Japan
Event Type:international Conference
Organizer:The Society of Material Science Japan (JSMS)
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:L - no assignment
DLR - Research theme (Project):L - Low-Emission Air Traffic (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Experimental and Numerical Methods
Deposited By: Bartsch, Dr.-Ing. Marion
Deposited On:03 Dec 2009 15:24
Last Modified:03 Dec 2009 15:24

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