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Torsion tests were performed as part of a study of the effects of texture on the biaxial plastic properties of Zircaloy tubing. The torsion yield strengths varied widely from lot to lot of tubing and, in every instance, were higher than those predicted by conventional failure theories. Variation in yield strength is ascribed to the presence or absence of texture-strengthening in the plane acted upon by the torsion stresses. Evaluation of the effect of texture is provided by comparison of torsion-yield strength ratios that we developed by modification of the maximum-shear-stress failure condition.
zirconium alloys, mechanical properties, nuclear reactors, tests, evaluation
Rittenhouse, P. L.
Metallurgist, Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, Tenn.