64746 2025 eng lecture 0 -- -- -- Within the current framework for safety assessment of ferritic ductile cast iron (DCI) containers for transport as well as interim and final storage of radioactive materials, the IAEA guidelines SSG 26 apply fracture mechanics principles. Crack initiation in either, stable or unstable modes is generally forbidden. Additionally, for DCI, the ASME-Code, Sect. III, Div. 3, WC-2330, explicitly requires a safety proof regarding dynamic loading conditions. Nevertheless, corresponding information given in the ASME Code does not seem to be sufficient to appropriately perform a dynamic fracture mechanics safety assessment for DCI. To address and improve this status of the dynamic brittle fracture safety assessment framework for DCI, the application of the fracture mechanics master curve (MC) concept to DCI is being investigated in an ongoing joint research project (acronym MCGUSS) between BAM Berlin and MPA Stuttgart. For ferritic DCI, the MCGUSS project addresses the currently lacking systematic review of applicability and potential modifications to the assumptions and the procedure according to ASTM E1921. The aim is to establish a methodology to determine and assess dynamic fracture toughness values of DCI in the ductile-to-brittle transition regime using small samples extracted from a component. The research approach and the planned investigations were outlined in more detail earlier. This paper is focused on the discussion of recent experimental results to establish the dynamic fracture mechanics toughness data base and its MC analyses. MCGUSS fracture mechanics test setups and the dynamic fracture toughness data base achieved at the time of abstract submission is discussed (covering 128 specimens). Current application limits of ASTM E1921 MC to DCI are discussed, and planned investigations to further investigate and modify the MC procedure for DCI are outlined. ASTM 23rd International ASTM/ESIS Symposium on Fatigue and Fracture Mechanics Atlanta, GA, USA 12.11.2025 13.11.2025 0 publish false true Wolfram Baer eng uncontrolled Dynamic fracture toughness eng uncontrolled Ductile cast iron eng uncontrolled Safety assessment eng uncontrolled Master curve eng uncontrolled Statistics Angewandte Physik 9 Komponentensicherheit Energie Datei im Netzwerk der BAM verfügbar ("Closed Access") Präsentation Kerntechnische Entsorgung 9.6 Additive Fertigung metallischer Komponenten