Low Cycle Fatigue Behavior of Zirconium Tube under the Cyclic Pressurization
Study was attempted to produce stress-life curve of the zirconium tube under the cyclic pressurization and to analyze its behavior. The internal pressurization machine was devised and the low cycle fatigue test at the zirconium cladding tube was carried out. The result showed that the O’Donnell and Langer relationship can be fitted to the fatigue behavior of the zirconium cladding under the cyclic pressurization, where the fatigue limit of the Zircaloy-4 at 350oC was shown at 341.6MPa. From the analysis of the diametral changes and the fractographic observation, a combined creep-fatigue interaction rather than a pure fatigue had an influence on the failure of the zirconium cladding under the cyclic pressurization at 350oC.
S.W. Nam, Y.W. Chang, S.B. Lee and N.J. Kim
J. H. Kim et al., "Low Cycle Fatigue Behavior of Zirconium Tube under the Cyclic Pressurization", Key Engineering Materials, Vols. 345-346, pp. 271-274, 2007