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Quantitative Evaluation of Ultrasonic Wave Propagation in Inhomogeneous Anisotropic Austenitic Welds using 3D Ray Tracing Method: Numerical and Experimental Validation
- Austenitic welds and dissimilar welds are extensively used in primary circuit pipes and pressure vessels in nuclear power plants, chemical industries and fossil fuelled power plants because of their high fracture toughness, resistance to corrosion and creep at elevated temperatures. However, cracks may initiate in these weld materials during fabrication process or stress operations in service. Thus, it is very important to evaluate the structural integrity of these materials using highly reliable non- destructive testing (NDT) methods. Ultrasonic non-destructive inspection of austenitic welds and dissimilar weld components is complicated because of anisotropic columnar grain structure leading to beam splitting and beam deflection. Simulation tools play an important role in developing advanced reliable ultrasonic testing (UT) techniques and optimizing experimental parameters for inspection of austenitic welds and dissimilar weld components. The main aim of the thesis is to develop a 3DAustenitic welds and dissimilar welds are extensively used in primary circuit pipes and pressure vessels in nuclear power plants, chemical industries and fossil fuelled power plants because of their high fracture toughness, resistance to corrosion and creep at elevated temperatures. However, cracks may initiate in these weld materials during fabrication process or stress operations in service. Thus, it is very important to evaluate the structural integrity of these materials using highly reliable non- destructive testing (NDT) methods. Ultrasonic non-destructive inspection of austenitic welds and dissimilar weld components is complicated because of anisotropic columnar grain structure leading to beam splitting and beam deflection. Simulation tools play an important role in developing advanced reliable ultrasonic testing (UT) techniques and optimizing experimental parameters for inspection of austenitic welds and dissimilar weld components. The main aim of the thesis is to develop a 3D ray tracing model for quantitative evaluation of ultrasonic wave propagation in an inhomogeneous anisotropic austeniticweld material. Inhomogenity in the anisotropic weld material is represented by discretizing into several homogeneous layers. According to ray tracing model, ultrasonic ray paths are traced during its energy propagation through various discretized layers of the material and at each interface the problem of reflection and transmission is solved. The influence of anisotropy on ultrasonic reflection and transmission behaviour in an anisotropic austenitic weld material are quantitatively analyzed in three dimensions. Theultrasonic beam directivity in columnar grained austenitic steel material is determined three dimensionally using Lamb’s reciprocity theorem. The developed ray tracing model evaluates the transducer excited ultrasonic fields accurately by taking into account the directivity of the transducer, divergence of the ray bundle, density of rays and phase relations as well as transmission coefficients. The ray tracing model is able to determine the ultrasonic wave fields generated by a point source as well as finite dimension array transducers.…
Autor*innen: | Sanjeevareddy Kolkoori |
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Dokumenttyp: | Dissertation |
Veröffentlichungsform: | Eigenverlag BAM |
Schriftenreihe (Bandnummer): | BAM Dissertationsreihe (112) |
Sprache: | Englisch |
Jahr der Erstveröffentlichung: | 2014 |
Veröffentlichende Institution: | Bundesanstalt für Materialforschung und -prüfung (BAM) |
Titel verleihende Institution: | Technische Universität Berlin, Fakultät V – Verkehrs- und Maschinensysteme |
Gutachter*innen: | Michael RethmeierORCiD, Marc Kreutzbruck |
Datum der Abschlussprüfung: | 10.04.2013 |
Verlag: | Bundesanstalt für Materialforschung und -prüfung (BAM) |
Verlagsort: | Berlin |
Jahrgang/Band: | 112 |
Erste Seite: | 1 |
Letzte Seite: | 272 |
DDC-Klassifikation: | Technik, Medizin, angewandte Wissenschaften / Chemische Verfahrenstechnik / Chemische Verfahrenstechnik |
Freie Schlagwörter: | 3D Ray Tracing Verfahren; Ultraschallfeld; Ultrasonic Field; Zerstörungsfreie Prüfung; austenitische Schweißnaht; inhomogene Materialien 3D Ray Tracing Method; Austenitic Weld; Inhomogeneous Materials; Nondestructive Testing |
URN: | urn:nbn:de:kobv:b43-469 |
ISSN: | 1613-4249 |
ISBN: | 978-3-9815944-6-1 |
Verfügbarkeit des Dokuments: | Datei für die Öffentlichkeit verfügbar ("Open Access") |
Lizenz (Deutsch): | Allgemeines Deutsches Urheberrecht |
Datum der Freischaltung: | 23.01.2015 |
Referierte Publikation: | Nein |