Abstract
Zircaloy-2 cladding tubes were tested under biaxial-combined-stresses produced by simultaneous axial tension and internal pressure. The experimental results showed that textured Zircaloy-2 tubing had the characteristics of strong anisotropy so that the shapes of yield loci at different values of effective strain ( \\ ̄ ge) were all characterized by “texture hardening”. The maximum ultimate hoop strength, which was of α = 0.7 (α = axial stress/tangential stress), was about 1.6 times as high as that of free-end burst test ( α = 0). In this paper the discussion concerning validity of the results predicted theoretically is also involved; and the authors find that the calculated yield loci from the results of uniaxial tests, based on Hill's criterion for anisotropic materials, agree approximately with the observed yield loci through biaxial-stress tests. With regard to the ductility, it was necessary to modify the existing theory to explain the observed results.
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