Abstract
The experimental apparatus developed for the biaxial SCC test and the deformation properties obtained under predetermined stress are described. The conclusions are: (1) Fracture of Zircaloy-2 cladding tubes under argon environment occurs after passing through the maximum loading point. Under iodine environment, however, the maximum loading point and decreasing load are followed by fracture under uniaxial tension, but fracture occurs during increasing load under biaxial tension. (2) Fracture ductilities for all stress ratios under the iodine environment are lower than those under argon. (3) Over the range of stress ratios in which tangential stress is larger than axial stress, fracture ductility for the argon environment is sensitive to the stress ratio. Under the iodine environment, however, the effective fracture elongation varies from about 5 to 8%.
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