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Advanced crack shape analysis using SAFT

  • The spatial resolution in ultrasonic testing as a wave phenomenon in nature is limited to a certain fraction of the wavelength, usually defined to be close to the Rayleigh criterion. In case of complicated reflector surfaces – such as stress corrosion cracking - this limitation prevents an exact visualization of the defect shape. There exist a few approaches to improve the spatial resolution, whose reconstruction quality all in common also depend on the achieved signal-to-noise ratio of the raw data. In this work we present a specific SAFT analysis, in which a high number of different angles of incidence produce a sufficiently high number of different reflections at the crack edges resulting in an improved SNR. In doing so, we reconstruct a coherent crack structure. First investigations were made at artificially simulated crack configurations with different contours and curvatures in flat and cylindrical test blocks. The measurements results – visualized by representative scans – showThe spatial resolution in ultrasonic testing as a wave phenomenon in nature is limited to a certain fraction of the wavelength, usually defined to be close to the Rayleigh criterion. In case of complicated reflector surfaces – such as stress corrosion cracking - this limitation prevents an exact visualization of the defect shape. There exist a few approaches to improve the spatial resolution, whose reconstruction quality all in common also depend on the achieved signal-to-noise ratio of the raw data. In this work we present a specific SAFT analysis, in which a high number of different angles of incidence produce a sufficiently high number of different reflections at the crack edges resulting in an improved SNR. In doing so, we reconstruct a coherent crack structure. First investigations were made at artificially simulated crack configurations with different contours and curvatures in flat and cylindrical test blocks. The measurements results – visualized by representative scans – show details of crack design and crack orientation. We also will present a comparison of the SAFT analysis between modelling and phased array measurements.zeige mehrzeige weniger

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Metadaten
Autor*innen:Rainer Boehm, Daniel Brackrock, Jessica Kitze, Gerhard Brekow, Marc Kreutzbruck
Persönliche Herausgeber*innen:D.O. Thompson, D.E. Chimenti
Dokumenttyp:Beitrag zu einem Tagungsband
Veröffentlichungsform:Verlagsliteratur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):QNDE conference 2010 - Review of progress in quantitative nondestructive evaluation (Proceedings)
Jahr der Erstveröffentlichung:2010
Herausgeber (Institution):American Institute of Physics
Verlagsort:Melville, NY
Erste Seite:1
Letzte Seite:8
Freie Schlagwörter:Phased array; SAFT; Ultrasonic testing
Veranstaltung:36th Annual Review of Progress in Quantitative Nondestructive Evaluation
Veranstaltungsort:Kingston, RI, USA
Beginndatum der Veranstaltung:2009-07-26
Enddatum der Veranstaltung:2009-07-31
ISSN:0743-0760
ISSN:0094-243X
ISBN:978-0-7354-0748-0
Bemerkung:
Serientitel: AIP conference proceedings – Series title: AIP conference proceedings
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:Ja
Datum der Eintragung als referierte Publikation:19.08.2010
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