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National Repository of Grey Literature 4 records found  Search took 0.00 seconds. 
Micromechanistical aspects of crack length effect on fracture toughness and transition behaviour of steels
 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.
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Numerical and experimental determination of fracture characteristics for body with a crack
 Vlček, Libor ; Kozák, Vladislav
The base of this work is the comparison of two methods used for hardening exponent modelling (deformation plasticity and incremental theory) and their influence on the Q parameter and J integral.
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The effect of loading rate on reference temperature T0 and fracture toughness master curve
 Holzmann, Miloslav ; Jurášek, Ladislav ; Dlouhý, Ivo
Various aspects of the master curve methodology have been investigated experimentally based on data obtained with different pressure vessel and container steel. A manganese cast steel has been utilised being considered for storage containers of spent nuclear fuel. Different methodologies of reference temperature determination have been followed. Transferability of data from small pre-cracked specimens to standard ones has been also followed.
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Estimation of the Critical Stress for Failure of a Protective Layer
 Náhlík, Luboš
This contribution describes a study of the behaviour of a crack growing in a protective layer and penetrating through an interface into a substrate. Special attention is devoted to a crack touching the interface. Conditions for the stability of a crack terminating at the interface between two materials are analyzed. The problem is studied under the assumptions of linear-elastic fracture mechanics. A new tentative criterion of stability based on application of the strain energy density concept is formulated and applied to the problem. The suggested criterion is used to estimate the critical applied stress for the failure of a substrate caused by a crack growing through the protective layer. It is shown that the critical stress may strongly depend on the fracture toughness of the substrate and on the bi-material parameters.
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