Nonlinear acoustic effects in polycrystalline solids with saturation of amplitude-dependent internal friction
Nazarov V. E. 1, Kiyashko S. B. 1
1Institute of Applied Physics, Russian Academy of Sciences, Nizhny Novgorod, Russia
Email: v.e.nazarov@appl.sci-nnov.ru, sergei-kiyashko@mail.ru

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Theoretical and numerical studies of nonlinear acoustic effects arising from the propagation of initially harmonic waves in polycrystalline solids with saturation of amplitude-dependent internal friction have been carried out. Two main types of hysteresis are considered: elastic and inelastic. A comparative analysis of the regularities of nonlinear effects is carried out and the characteristics of nonlinear quasi-harmonic waves in such media are determined: amplitude-dependent losses and changes in propagation velocity, as well as amplitudes of higher harmonics. A method for determining the type of polycrystal hysteresis based on the analysis of theoretical and experimentally established amplitude dependences of nonlinear effects is proposed. Keywords: elastic waves, amplitude-dependent internal friction.
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