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	Micromechanical aspects of constraint effect at brittle fracture initiation Chlup, Zdeněk ; Dlouhý, Ivo Cast manganese steel predetermined for container casks of spent nuclear fuel has been tested extensively from the point of view of resistance against brittle fracture. For the fracture toughness evaluation the three-point bend specimens with different crack length (varying a/W ratio > 0,5; 0,2; 0,1) and with the same ligament below the crack tip have been used. Stress distributions below crack tip have been calculated by finite elements method (ABAQUS code) for each specimen geometry separately. Modification has been introduced into calculation taking into account specific material behaviour. Detailed record
	Complex assessment of fracture properties of cast ferritic steel Dlouhý, Ivo ; Chlup, Zdeněk ; Kozák, Vladislav ; Holzmann, Miloslav Complex analysis of fracture behaviour for low carbon manganese steel intended for fabrication of large containers of spent nuclear fuel (SKODA) has been carried out. Two locations, surface layer and central part, of the thick-walled plate have been followed in order to evaluate the material fracture resistance of full-scale cask segment. Fracture toughness data were determined for two different loading rates. Two specimen geometries, standard ones and subsized Charpy type specimens have been applied for the investigation. For dynamic loading two calculation procedures of dynamic fracture toughness determination have been applied, the first one arising from quasistatic approach and the other based on concept of dynamic key curve method. The transferability of results received on the small pre-cracked Charpy specimens was analysed and applied with good results. Detailed record
	Toughness scaling models application Dlouhý, Ivo ; Kozák, Vladislav ; Holzmann, Miloslav Toughness scaling model arising from basic definition of Dodds and Anderson has been applied for data adjustment in constraint dependent regime in transition region and data from subsized pre-cracked specimens. Similar model has been developed based on local parameters - Weibull stress and location parameter. The fracture toughness temperature diagram has been predicted by using data from the pre-cracked Charpy type specimen corrected applying the toughness scaling model. Introducing the statistical scale effects corrections good correlation of predicted data to those measured with 1T specimens has been obtained. Detailed record

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