Abstract
Ultrasonic wave velocities in a plastically deformed medium are known to depend upon its microstructural properties. Therefore, one of the authors proposed a theoretical model of an ultrasonic nondestructive method in order to evaluate plastically deformed states. We obtained good agreement between the numerical and experimental results for an aluminum alloy specimen subjected to uniaxial tension and reported the influence of annealing upon plastic anisotropy and the correlation between the Lankford's value and the shape of yield surface of the specimen. In order to verify the proposed theory we simulated using the internal state variables of an anisotropic distortional yield model longitudinal wave velocities under combined stress states and the subsequent yield surfaces, which were determined to agree well with the experimental results of the longitudinal and transverse wave velocity changes under uniaxial tension test, and then compared the simulated results with experimental results of the longitudinal wave velocity and the yield surface of the aluminum alloy tested in combinations of tension or compression and torsion.
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