Database of local criteria for pressure vessel overlay fractures

A database of local criteria for fractures of the irradiated overlays of reactor pressure vessels was created based on tests performed at operated WWER-440 type reactors. The tensile properties were determined, and a partly physical model was employed to derive the fracture toughness values. The Rice-Tracey model was adopted for application of the ''local approach''. Creating the database thus implied finding the (R/R0)c criterion values for each stress-deformation dependence (determined for the idealized shape e. g. by the Rp0.2, Rm and Am value set) and the corresponding J0.2 value by numerical simulation of the fracture toughness test. (author). 3 tabs., 16 figs., 8 refs