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Determination of fatigue crack propagation thresholds using small scale specimens

  • The damage tolerance approach is widely used in the design and estimation of inspection intervals of safety-relevant metallic components subject to fatigue loading. The approach relies on the knowledge of the fatigue crack propagation characteristics, wherein a relevant role is played by the fatigue crack propagation threshold. Nevertheless, the use of material data determined by testing on conventional specimens is not straightforward in case of thin-walled components such as turbine-blades or additively manufactured parts, in which the local variation of material properties in highly stressed regions must be considered. In these cases, the possibility of investigating the fatigue crack propagation properties on a limited portion of material is crucial. For this purpose, a new test methodology has been developed for small-scale specimens which allows the determination of the intrinsic fatigue crack propagation threshold and the near-threshold regime. The use of small-scale specimensThe damage tolerance approach is widely used in the design and estimation of inspection intervals of safety-relevant metallic components subject to fatigue loading. The approach relies on the knowledge of the fatigue crack propagation characteristics, wherein a relevant role is played by the fatigue crack propagation threshold. Nevertheless, the use of material data determined by testing on conventional specimens is not straightforward in case of thin-walled components such as turbine-blades or additively manufactured parts, in which the local variation of material properties in highly stressed regions must be considered. In these cases, the possibility of investigating the fatigue crack propagation properties on a limited portion of material is crucial. For this purpose, a new test methodology has been developed for small-scale specimens which allows the determination of the intrinsic fatigue crack propagation threshold and the near-threshold regime. The use of small-scale specimens poses a challenge to the applicability of the method to metallic materials, especially regarding the limitations on material strength and requirements for the application of the linear elastic fracture mechanics concepts. These aspects are discussed in this work. Furthermore, the application on the high strength steel S960QL is presented, along with a comparison with data determined by conventional testing.zeige mehrzeige weniger

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Metadaten
Autor*innen:Tiago Werner
Koautor*innen:Sergio Blasón, Mauro Madia, Julius Kruse, M. Benedetti
Dokumenttyp:Vortrag
Veröffentlichungsform:Präsentation
Sprache:Englisch
Jahr der Erstveröffentlichung:2021
Organisationseinheit der BAM:9 Komponentensicherheit
9 Komponentensicherheit / 9.4 Integrität von Schweißverbindungen
DDC-Klassifikation:Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurwissenschaften und zugeordnete Tätigkeiten
Freie Schlagwörter:Fatigue crack growth; Small scale testing; Threshold regime
Themenfelder/Aktivitätsfelder der BAM:Material
Material / Degradation von Werkstoffen
Veranstaltung:Fatigue Design 2021
Veranstaltungsort:Online meeting
Beginndatum der Veranstaltung:17.11.2021
Enddatum der Veranstaltung:18.11.2021
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:19.11.2021
Referierte Publikation:Nein
Eingeladener Vortrag:Nein
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