期刊
NONLINEAR ACOUSTICS: STATE-OF-THE-ART AND PERSPECTIVES (ISNA 19)
卷 1474, 期 -, 页码 200-203出版社
AMER INST PHYSICS
DOI: 10.1063/1.4749330
关键词
Relaxation; slow time; Arrhenius law; Rayleigh waves
A mechanism of nonlinear acoustic relaxation in structured media (slow time) is suggested which is based on the inter-grain contacts and the Arrhenius law for the potential barrier energy. This model results in a logarithmic relaxation law for sound velocity and the frequency of nonlinear resonance in samples of different materials. Estimates of a characteristic volume of interacting contacts give close numbers for the variety of consolidated materials, and, as expected, larger values for non-consolidated media and shear deformations. For weak (linear) waves and oscillations, the log relaxation occurs if, along the thermodynamic effects, a classical quadratic nonlinearity is also present.
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