Atypical evolution of solitary wave propagating in nonlinear elastic medium

Rushchitsky, JJ
Yurchuk, VM
Dopov. Nac. akad. nauk Ukr. 2020, 12:28-37
Section: Mechanics
Language: Ukrainian

The atypical evolution of a solitary cylindrical wave that propagates in the nonlinear elastic medium and has the initial profile in the form of the Macdonald function is described and commented. In the analysis, the approximate method of restriction on the gradient of a deformation is used, and three first approximations are taken into account. Two examples of typical wave evolution — harmoniс and bell-shaped waves — are shown and commented, where the first three approximations are also taken into account. The numerical modeling showed that the atypical initial profile (profile without a hump) evolves atypically — the profile becomes essentially steeper, saving the concavity, and the wave bottom decreases almost two times.

Keywords: evolution of a wave initial profile, Macdonald functions, method of res triction on the gradient of a deformation, solitary nonlinear elastic wave, three first approximations

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