Abstract
The modified Gurson model is used to determine micromechanical toughness parameters of a weld material from the irradiation surveillance of a reactor pressure vessel. These parameters were used to numerically simulate static and dynamic fracture mechanics tests for the determination of J- resistance curves. The results were confirmed by means of experiments with irradiated subsized specimens of the original material. The essential steps of the analysis—the consideration of rate-dependent stress-strain curves and the determination of the material parameters, as well as the numerical modelling of the boundary conditions at the supports of the Charpy specimen—were validated by comparing analyses and experiments with a representative unirradiated submerged are weld material. The initiation values of the J- resistance curves converted into pseudo-plane strain fracture toughness values K Ic allowed the conservative adjustment of the ASME reference fracture toughness curve.
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