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Non-destructive Evaluation Methods for CMC Components

Ullmann, Thomas und Jemmali, Raouf und Hofmann, Severin (2009) Non-destructive Evaluation Methods for CMC Components. 33rd International Conference on Advanced Ceramic Materials, 19.-23. Jan. 2009, Daytona Beach, FL (USA).

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Kurzfassung

The assessment of flaws, material damage and mechanisms which encourage the propagation of damage belongs to the most challenging objectives for non-destructive evaluation when applied on inhomogeneous microstructures like that of ceramic matrix composites. The operative point is the distinction between unavoidable or even desirable features of microstructure and failure critical elements which may initiate the formation of serious component damage later on. So far the lack of an established knowledge base for the classification and validation of microstructural features makes it almost impossible to predict the material’s behavior under certain thermo-mechanical load scenarios and therefore its lifetime expectation. With the C/C-SiC composite material which is manufactured by using the three step liquid silicon infiltration process, there is a widespread variability of microstructures and material properties which depend to the chosen fabrication parameters. Though there is a whole bunch of non-destructive inspection techniques available, it still remains very difficult to drive the right conclusions from the analysis data. While most of the well proven non-destructive evaluation analysis techniques as for example ultrasound mapping, radiography inspection or lock-in thermography imaging still demand a relatively high level of experience for proper measurement interpretation, the 3-dimensional computed tomography technique offers much more information density with by far higher resolution of the inner structure of the investigated object. Therefore the danger of misinterpretation of microstructural anomalies or material flaws is almost negligible. However, with increasing measurement information it becomes even more difficult to evaluate the consequences that may result from the observed features with respect to the material’s behaviour under mechanical load. Thus, the systematical identification and quantitative classification of material defects and failure critical design elements of structure components as part of a reliable quality assurance system is a goal of highest priority.

Dokumentart:Konferenzbeitrag (Paper)
Titel:Non-destructive Evaluation Methods for CMC Components
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Ullmann, Thomasthomas.ullmann@dlr.de
Jemmali, Raoufraouf.jemmali@dlr.de
Hofmann, Severinseverin.hofmann@dlr.de
Datum:Juli 2009
Stichwörter:Non-destructive testing, NDE, CMC, C/C-SiC, radiography, lock-in thermopgraphy, ultrasound inspection, computed tomography, CT
Veranstaltungstitel:33rd International Conference on Advanced Ceramic Materials
Veranstaltungsort:Daytona Beach, FL (USA)
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:19.-23. Jan. 2009
Veranstalter :American Ceramic Society
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W FR - Forschung unter Weltraumbedingungen (alt)
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W SY - Technik für Raumfahrtsysteme
DLR - Teilgebiet (Projekt, Vorhaben):W - Vorhaben Materialwissenschaftliche Forschung (alt)
Standort: Stuttgart
Institute & Einrichtungen:Institut für Bauweisen- und Konstruktionsforschung > Keramische Verbundstrukturen
Hinterlegt von: Thomas Ullmann
Hinterlegt am:27 Jan 2010 09:33
Letzte Änderung:27 Jan 2010 09:33

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