Abstract
Structural integrity evaluation of thin-walled tubes in various industries requires transverse mechanical properties, crack initiation toughness as well as ductile fracture resistance data of these components. In this work, the failure behavior, mechanical properties, and fracture resistance behavior of Zircaloy-4 fuel-clad tubes of Indian pressurized heavy-water reactor have been studied. As standard specimens cannot be machined from these components, ring-type segments of these components are directly tested in different types of loading setups. Both the specimen and the mandrel were modeled through 3D finite-element analysis and by comparing the results of analysis with experiment; the material stress-strain curve was evaluated using an inverse analysis procedure. For estimation of fracture resistance behavior, two types of loading mandrels, viz., conical mandrel and pair of semi-cylindrical split mandrels, have been used to open the axial crack in the tubular specimen and fracture resistance behavior in terms of J - R curve obtained from both the tests have been compared.
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