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Reference load versus limit load in engineering flaw assessment: A proposal for a hybrid analysis option

  • The net section limit load FY is a key input parameter for the accuracy of any elastic-plastic flaw assessment procedure of the R6 type. Unfortunately available limit load solutions are of variable quality since they have been obtained over decades by different methods. As a consequence the results of the fracture analyses such as the critical load or crack size are limited in their accuracy and are often significantly conservative. A further problem is that common limit load solutions based on ligament yielding are inadequate in a number of cases even for through crack configurations and should be replaced by some kind of local yielding solutions. In the present paper a simple and straightforward reference load definition is proposed instead of the limit load which strictly corresponds to a ligament yielding parameter Lr = 1 in the R6 Routine and similar approaches such as SINTAP and FITNET. This can be determined by finite element simulation for any geometry. In addition to aThe net section limit load FY is a key input parameter for the accuracy of any elastic-plastic flaw assessment procedure of the R6 type. Unfortunately available limit load solutions are of variable quality since they have been obtained over decades by different methods. As a consequence the results of the fracture analyses such as the critical load or crack size are limited in their accuracy and are often significantly conservative. A further problem is that common limit load solutions based on ligament yielding are inadequate in a number of cases even for through crack configurations and should be replaced by some kind of local yielding solutions. In the present paper a simple and straightforward reference load definition is proposed instead of the limit load which strictly corresponds to a ligament yielding parameter Lr = 1 in the R6 Routine and similar approaches such as SINTAP and FITNET. This can be determined by finite element simulation for any geometry. In addition to a previous study on thin wall notched plates the method is applied to plates containing shallow semi-elliptical surface cracks. The results demonstrate that the approach provides a suitable extension and improvement of the existing methods.zeige mehrzeige weniger

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Metadaten
Autoren/innen:Uwe Zerbst, R. A. Ainsworth, Mauro Madia
Persönliche Herausgeber/innen:D. Klingbeil, M. Vormwald, K.-G. Eulitz
Dokumenttyp:Beitrag zu einem Sammelband
Veröffentlichungsform:Verlagsliteratur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):18th European conference on fracture (ECF 18) - Fracture of materials and structures from micro to macro scale (Proceedings)
Jahr der Erstveröffentlichung:2010
Herausgeber (Institution):Deutscher Verband für Materialforschung und -prüfung e.V. (DVM)
Ausgabe/Heft:Paper 81
Erste Seite:1
Letzte Seite:11
Freie Schlagwörter:EPRI method; FITNET; Flaw assessment; Limit load; R6 procedure; Reference load; Reference stress method; SINTAP
Veranstaltung:18th European conference on fracture (ECF 18) - Fracture of materials and structures from micro to macro scale
Veranstaltungsort:Dresden, Germany
Beginndatum der Veranstaltung:2010-08-30
Enddatum der Veranstaltung:2010-09-03
ISBN:978-3-00-031802-3
Verfügbarkeit des Volltexts:Papiergebundenes Belegexemplar in der Bibliothek der BAM vorhanden ("Hard-copy Access")
Bibliotheksstandort:Sonderstandort: Publica-Schrank
Datum der Freischaltung:19.02.2016
Referierte Publikation:Nein