Determining the Material Parameters for the Reconstruction of Defects in Carbon Fiber Reinforced Polymers from Data Measured by Flash Thermography
- Flash thermography is a fast and reliable non-destructive testing method for the investigation of defects in carbon fiber reinforced polymer (CFRP) materials. In this paper numerical simulations of transient thermography data are presented, calculated for a quasi-isotropic flat bottom hole sample. They are compared to experimental data. These simulations are one important step towards the quantitative reconstruction of a flaw by assessing thermographic data. The applied numerical model is based on the finite-element method, extended by a semi-analytical treatment of the boundary of the sample, which is heated by the flash light. A crucial part for a reliable numerical model is the prior determination of the material parameters of the specimen as well as of the experimental parameters of the set-up. The material parameters in plane and in depth diffusivity are measured using laser line excitation. In addition, the absorption and heat transfer process of the first layers is investigatedFlash thermography is a fast and reliable non-destructive testing method for the investigation of defects in carbon fiber reinforced polymer (CFRP) materials. In this paper numerical simulations of transient thermography data are presented, calculated for a quasi-isotropic flat bottom hole sample. They are compared to experimental data. These simulations are one important step towards the quantitative reconstruction of a flaw by assessing thermographic data. The applied numerical model is based on the finite-element method, extended by a semi-analytical treatment of the boundary of the sample, which is heated by the flash light. A crucial part for a reliable numerical model is the prior determination of the material parameters of the specimen as well as of the experimental parameters of the set-up. The material parameters in plane and in depth diffusivity are measured using laser line excitation. In addition, the absorption and heat transfer process of the first layers is investigated using an IR microscopic lens. The performance of the two distinct components of CFRP during heating – epoxy resin and carbon fibers – is examined. Finally, the material parameters are optimized by variation and comparison of the simulation results to the experimental data. The optimized parameters are compared to the measured ones and further methods to ensure precise material parameter measurements are discussed.…
Autor*innen: | Jan P. Müller, S. Götschel, Christiane MaierhoferORCiD, M. Weiser |
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Dokumenttyp: | Zeitschriftenartikel |
Veröffentlichungsform: | Verlagsliteratur |
Sprache: | Englisch |
Titel des übergeordneten Werkes (Englisch): | AIP Conference Proceedings |
Jahr der Erstveröffentlichung: | 2017 |
Verlag: | AIP Publishing |
Verlagsort: | Melville, NY, USA |
Jahrgang/Band: | 1806 |
Ausgabe/Heft: | 1 |
Erste Seite: | UNSP 100006-1 |
Letzte Seite: | 11 |
DDC-Klassifikation: | Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurwissenschaften und zugeordnete Tätigkeiten |
Freie Schlagwörter: | Aktive Thermografie; CFK; Kohlenstofffaserverstärkter Kunststoff; Thermische Diffusivität; Zerstörungsfreie Prüfung Active thermography; CFRP; Carbon fiber reinforced polymer; Non-Destructive testing; Thermal diffusivity |
Veranstaltung: | 43rd Review of Progress in Quantitative Nondestructive Evaluation |
Veranstaltungsort: | Atlanta, GA, USA |
Beginndatum der Veranstaltung: | 17.07.2016 |
Enddatum der Veranstaltung: | 22.07.2016 |
DOI: | 10.1063/1.4974671 |
ISSN: | 0094-243X |
ISBN: | 978-0-7354-1474-7 |
Verfügbarkeit des Dokuments: | Datei im Netzwerk der BAM verfügbar ("Closed Access") |
Datum der Freischaltung: | 13.03.2017 |
Referierte Publikation: | Ja |
Datum der Eintragung als referierte Publikation: | 07.07.2017 |