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Using UT-SAFT for analysis of stress corrosion cracking

  • Stress corrosion cracking is a transcrystalline or intercrystalline crack formation in materials which occurs under the influence of static tensile stress or residual stress and a specific aggressive medium such as chloride containing substances. This special sort of crack formation is involved in complex crack configurations, which may only insufficiently be captured by conventional ultrasonic probes with fixed angles of incidence. Only a number of different beam angles produce sufficient reflection to reconstruct the complete defect shape from measured ultrasonic data. The SAFT algorithm, which was recently successfully used in many industrial NDT-applications, is a promising tool for the reconstruction process. In addition, the combination of phased array technique and SAFT was developed in several projects by BAM, Berlin. Investigations using phased array equipment were performed to look into crack configurations in test blocks with different surface curvatures. UT-SAFT has beenStress corrosion cracking is a transcrystalline or intercrystalline crack formation in materials which occurs under the influence of static tensile stress or residual stress and a specific aggressive medium such as chloride containing substances. This special sort of crack formation is involved in complex crack configurations, which may only insufficiently be captured by conventional ultrasonic probes with fixed angles of incidence. Only a number of different beam angles produce sufficient reflection to reconstruct the complete defect shape from measured ultrasonic data. The SAFT algorithm, which was recently successfully used in many industrial NDT-applications, is a promising tool for the reconstruction process. In addition, the combination of phased array technique and SAFT was developed in several projects by BAM, Berlin. Investigations using phased array equipment were performed to look into crack configurations in test blocks with different surface curvatures. UT-SAFT has been used for the analysis of spark-eroded notches simulating stress corrosion cracks at the thermo sleeve weld of a nozzle. For comparison, UT-SAFT has also been applied for the analysis of real reflectors at the same position in a nozzle used in a power plant, which was repaired later on. SAFT-scans received from reconstructed ultrasonic measurement data confirm the practical usefulness of the SAFTalgorithm developed by BAM.zeige mehrzeige weniger

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Metadaten
Autor*innen:Gerhard Brekow, Marc Kreutzbruck, Rainer Boehm, Jessica Kitze, H. Eggers, M. Böwe
Dokumenttyp:Beitrag zu einem Tagungsband
Veröffentlichungsform:Verlagsliteratur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):8th International conference on NDE in relation to structural integrity for nuclear and pressurised components (DGZfP-Proceedings)
Jahr der Erstveröffentlichung:2010
Herausgeber (Institution):Deutsche Gesellschaft für Zerstörungsfreie Prüfung (DGZfP)
Verlagsort:Berlin
Ausgabe/Heft:DGZfP-BB 125 (Th.2.B.1)
Erste Seite:1
Letzte Seite:10
Freie Schlagwörter:D-nozzle; Phased array technique; Real and simulated cracks; SAFT reconstruction; Stress corrosion cracking
Veranstaltung:8th International conference on NDE in relation to structural integrity for nuclear and pressurised components
Veranstaltungsort:Berlin, Germany
Beginndatum der Veranstaltung:2010-09-29
Enddatum der Veranstaltung:2010-10-01
ISBN:978-3-940283-30-6
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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