Modern Safety Assessment of Cubic Cast Iron Containers Under Mechanical Impact

  • In the present study, ductile cast iron from an original DCI container with a wide variety of microstructure was investigated in order to determine the materials fracture toughness under impact loading conditions. Three-point bending specimens with thickness of 140 mm from a cubic DCI container were investigated at elevated loading rates to provide reliable fracture toughness parameters for the assessment procedures. In contrast to static fracture behaviour, the fracture toughness values of thick-walled DCI at higher loading rates show a remarkable reduction with decreasing temperature up to –50 °C and a significant shift of the transition range. The lower bound fracture toughness value used in the BAM DCI safety concept was confirmed for impact loading conditions by these fracture mechanics tests using large specimens. These measurements are relevant to the licensing tests for storage containers without shock absorbers, especially to the assessment of the dynamic behaviour ofIn the present study, ductile cast iron from an original DCI container with a wide variety of microstructure was investigated in order to determine the materials fracture toughness under impact loading conditions. Three-point bending specimens with thickness of 140 mm from a cubic DCI container were investigated at elevated loading rates to provide reliable fracture toughness parameters for the assessment procedures. In contrast to static fracture behaviour, the fracture toughness values of thick-walled DCI at higher loading rates show a remarkable reduction with decreasing temperature up to –50 °C and a significant shift of the transition range. The lower bound fracture toughness value used in the BAM DCI safety concept was confirmed for impact loading conditions by these fracture mechanics tests using large specimens. These measurements are relevant to the licensing tests for storage containers without shock absorbers, especially to the assessment of the dynamic behaviour of crack-like defects inside a cask structure under drop test conditions. Using extensive dynamic numerical analyses it could be shown, that for special crack configurations the dynamic crack tip parameter (KI, or J) may be estimated by static formulae even under mechanical impact. These results of the safety assessment were verified according to the German Konrad repository acceptance criteria by a drop test with a cubic waste container with artificial crack-like defects from 5 m height onto a representative storage facility foundation.zeige mehrzeige weniger

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Metadaten
Autor*innen:Uwe Zencker, Karsten Müller
Dokumenttyp:Beitrag zu einem Tagungsband
Veröffentlichungsform:Graue Literatur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):Transactions of the SMIRT 17
Jahr der Erstveröffentlichung:2003
Herausgeber (Institution):International Association for Structural Mechanics in Reactor Technology
Verlagsort:Prague
Ausgabe/Heft:G04-4
Erste Seite:1(?)
Letzte Seite:8(?)
Freie Schlagwörter:Ductile cast iron; Dynamic fracture; Mechanical impact; Safety assessment; Storage containers
Veranstaltung:17th International Conference on Structural Mechanics in Reactor Technology ; SMiRT 17
Veranstaltungsort:Prague, Czech Republic
Beginndatum der Veranstaltung:2003-08-17
Enddatum der Veranstaltung:2003-08-22
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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