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Heat transfer modeling of local thermal excitation for surface crack detection and characterization

  • In the presented paper the use of local excitation (laser beam) for crack detection and characterization is simulated. As we could see, using the temperature differences between two reference points was large enough to detect and characterize the crack, even for such small value of laser power as 2 W. The influence of radiation and convection on the temperature difference was negligible (about 0.1%). The influence of heat conduction, in case of crack with air, was very small (about 3%). The main mechanism which influences the temperature differences between the reference points is the heat conduction in steel. From the presented results one can see that temperature differences are increasing with an increase of the crack depth or the crack length. Better resolution and characterization of the crack depths and lengths should be achieved with increased duration of heating time or the laser power. We could also see that the best position for the laser spot to characterize the crack is theIn the presented paper the use of local excitation (laser beam) for crack detection and characterization is simulated. As we could see, using the temperature differences between two reference points was large enough to detect and characterize the crack, even for such small value of laser power as 2 W. The influence of radiation and convection on the temperature difference was negligible (about 0.1%). The influence of heat conduction, in case of crack with air, was very small (about 3%). The main mechanism which influences the temperature differences between the reference points is the heat conduction in steel. From the presented results one can see that temperature differences are increasing with an increase of the crack depth or the crack length. Better resolution and characterization of the crack depths and lengths should be achieved with increased duration of heating time or the laser power. We could also see that the best position for the laser spot to characterize the crack is the closest one. Also, comparison of 2D and 3D simulation results for circular heat source used as local excitation mechanism had showed that only full 3D modelling will allow accomplishing a quantitative level of comparison between experimental and simulation results.zeige mehrzeige weniger

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Metadaten
Autor*innen:Guram N. Kervalishvili, Joachim Schlichting, Christiane MaierhoferORCiD, Marc Kreutzbruck
Dokumenttyp:Beitrag zu einem Tagungsband
Veröffentlichungsform:Verlagsliteratur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):ECNDT 2010 - 10th European conference on non-destructive testing (Proceedings)
Jahr der Erstveröffentlichung:2010
Herausgeber (Institution):European federation for non-destructive testing (EFNDT)
Erste Seite:1
Letzte Seite:10
Freie Schlagwörter:Heat transfer modeling; Surface crack; Thermography
Veranstaltung:ECNDT 2010 - 10th European conference on non-destructive testing
Veranstaltungsort:Moscow, Russia
Beginndatum der Veranstaltung:2010-06-07
Enddatum der Veranstaltung:2010-06-11
ISBN:978-1-617-82791-4
Verfügbarkeit des Dokuments:Physisches Exemplar in der Bibliothek der BAM vorhanden ("Hardcopy Access")
Bibliotheksstandort:Sonderstandort: Publica-Schrank
Datum der Freischaltung:19.02.2016
Referierte Publikation:Nein
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