The results of experimental investigations of the influence of plastic deformation
and cyclic loading on the structural state and strength properties of samples of steel and
duralumin are given. The value of the acoustic anisotropy of the material, that is, the relative
difference of velocities (delays) mutually perpendicular polarized shear waves propagating
perpendicular to the line of loading, was used as an informative parameter of ultrasonic
testing. The ability to use echo-method of nondestructive testing, by means of shear waves,
for the study of elastic-plastic properties and damage of engineering material in the process of
fatigue failure, is proved.
Keywords: steel; duralumin; cyclic loading; ultrasonic testing.
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