Various combinations of biaxial stress were applied on five batches of recrystallized zircaloy-2 fuel cladding tubes with different textures ; elongation in both axial and circumferential directions of the specimen was measured continuously up to 5% plastic deformation.T h e anisotropic theory of plasticity proposed by Hill was applied t o t h e resulting data, and anisotropy constants were obtained through the two media of plastic strain loci and plastic strain ratios. Comparison of t h e results obtained with the two methods proved that t h e plastic strain loci provide d a t a that a r e more effective in predicting quantitatively the plastic deformation behavior of the zircaloy-2 tubes. T h e anisotropy constants change their value with progress of plastic deformation, and judicious application of t h e effective stress and effective strain obtained on anisotropic materials will permit the relationship between stress and strain under various biaxialities of stresses t o be approximated by t h e work hardening law.T h e test specimens used in t h e plastic deformation experiments were then stressed t o fracture under the s a m e combination of biaxial stress as i n the proceeding experiments, and t h e deformation in the fractured part was measured. T h e result proved t h a t t h e tilt angle of the c-axis which serves a s the index of texture is related to fracture ductility under biaxial stress. Based on this relationship, it was concluded that material with a tilt angle ranging from 10" t o 15" is the most suitable for fuel cladding tubes, from t h e viewpoint of fracture ductility, at least in the case of unirradiated material.
Various combinations of biaxial stress were applied on five batches of recrystallized zircaloy-2 fuel cladding tubes with different textures ; elongation in both axial and circumferential directions of the specimen was measured continuously up to 5% plastic deformation.T h e anisotropic theory of plasticity proposed by Hill was applied t o t h e resulting data, and anisotropy constants were obtained through the two media of plastic strain loci and plastic strain ratios. Comparison of t h e results obtained with the two methods proved that t h e plastic strain loci provide d a t a that a r e more effective in predicting quantitatively the plastic deformation behavior of the zircaloy-2 tubes. T h e anisotropy constants change their value with progress of plastic deformation, and judicious application of t h e effective stress and effective strain obtained on anisotropic materials will permit the relationship between stress and strain under various biaxialities of stresses t o be approximated by t h e work hardening law.T h e test specimens used in t h e plastic deformation experiments were then stressed t o fracture under the s a m e combination of biaxial stress as i n the proceeding experiments, and t h e deformation in the fractured part was measured. T h e result proved t h a t t h e tilt angle of the c-axis which serves a s the index of texture is related to fracture ductility under biaxial stress. Based on this relationship, it was concluded that material with a tilt angle ranging from 10" t o 15" is the most suitable for fuel cladding tubes, from t h e viewpoint of fracture ductility, at least in the case of unirradiated material.
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