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.…
Autor*innen: | Rainer Boehm, Daniel Brackrock, Jessica Kitze, Gerhard Brekow, Marc Kreutzbruck |
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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 |