D. A. Tretyakov

ACOUSTIC ANISOTROPY AT DIFFERENT STAGES OF THE DEFORMATION PROCESS IN METALS

The paper investigates acoustic anisotropy arising under inelastic loading of industrial alloy structures. The results of ultrasonic measurements on specimens of an aluminum-manganese alloy indicate a nonlinear nonmonotonic strain dependence of acoustic anisotropy. It cannot be explained in terms of the theory of acoustoplasticity and the Murnaghan nonlinear elastic model. This theory establishes a linear relationship between acoustic anisotropy and plastic strain. The location of the zones of nonmonotonic changes in the value of acoustic anisotropy is compared with the points on the strain curve. The results suggest that that acoustic anisotropy is an indicator of the beginning of various stages of the deformation process in metals.

Acknowledgments: The research was financially supported by the Siemens grant program.

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