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Critical speed of flawed rotors: global vs local approach

  • The burst of a disc in rotating machinery can cause catastrophic damage of the equipment and, more importantly, it can represent a mortal threat to anyone in the sphere of influence of the event. In order to minimize the danger associated to a rotating component failure, burst testing is required by the authorities in order to set safety margins to the normal operating speeds. Moreover more accurate predicting tools are required for designing the components. This paper presents the results of a numerical and analytical study on the assessment of the crack driving force for discs containing surface flaws. The aim is to provide a simple, though reliable, tool in order to be able to calculate the possible dangerous in-service speed for a rotating component and, therefore, to set burst margins above the normal operating conditions of the equipment. An R6-like flaw assessment procedure is adopted considering different assumptions in the definition of the critical speed and the analyticalThe burst of a disc in rotating machinery can cause catastrophic damage of the equipment and, more importantly, it can represent a mortal threat to anyone in the sphere of influence of the event. In order to minimize the danger associated to a rotating component failure, burst testing is required by the authorities in order to set safety margins to the normal operating speeds. Moreover more accurate predicting tools are required for designing the components. This paper presents the results of a numerical and analytical study on the assessment of the crack driving force for discs containing surface flaws. The aim is to provide a simple, though reliable, tool in order to be able to calculate the possible dangerous in-service speed for a rotating component and, therefore, to set burst margins above the normal operating conditions of the equipment. An R6-like flaw assessment procedure is adopted considering different assumptions in the definition of the critical speed and the analytical predictions are compared with the results of elastic-plastic finite element analysis of disc. In particular, the validity and potentiality of the method is proved for surface flaws in different positions in the disc.zeige mehrzeige weniger

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Metadaten
Autor*innen:L. Scolavino, S. Beretta, Mauro Madia, Uwe Zerbst
Dokumenttyp:Beitrag zu einem Tagungsband
Veröffentlichungsform:Verlagsliteratur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):ASME Turbo Expo 2014 - GT2014 - Turbine technical conference and exposition (Proceedings)
Jahr der Erstveröffentlichung:2014
Herausgeber (Institution):American Society of Mechanical Engineers (ASME)
Jahrgang/Band:7A
Erste Seite:26881, 1
Letzte Seite:8
Freie Schlagwörter:Critical speed; Flaw assessment; Flawed rotors
Veranstaltung:ASME Turbo Expo 2014 - GT2014
Veranstaltungsort:Düsseldorf, Germany
Beginndatum der Veranstaltung:16.06.2014
Enddatum der Veranstaltung:20.06.2014
DOI:10.1115/GT2014-26881
ISBN:978-0-7918-4576-9
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:20.02.2016
Referierte Publikation:Ja
Datum der Eintragung als referierte Publikation:12.01.2015
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