Simulating hydride embrittlement on cold-worked stress-relieved Zircaloy-4 with Gurson-Tvergaard-Needleman damage model

Titre du congrès :SMIRT-18 International Conference on Structural Mechanics in Reactor Technology Ville du congrès :Pékin Date du congrès :07/08/2005

The influence of hydride precipitates on the ductility of cold-worked stress-relieved Zircaloy-4 is analyzed using a Gurson-Tvergaard-Needleman (GTN) damage model. A GTN model previously determined on recristallized and hydrided Zircaloy-4 is adapted to the cold-worked stress-relieved alloy. In a following part, the adapted model is checked by calculating the fracture toughness values of cold-worked stress-relieved Zircaloy-4 and by comparing the obtained values to literature data. The obtained GTN model demonstrated its ability to determine fracture toughness of hydrided stress-relived Zircaloy-4 with a reasonable accuracy.