Izvestiya of Saratov University.

Mathematics. Mechanics. Informatics

ISSN 1816-9791 (Print)
ISSN 2541-9005 (Online)

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Zemlyanukhin A. I., Bochkarev A. V., Ratushny A. V., Chernenko A. V. Generalized model of nonlinear elastic foundation and longitudinal waves in cylindrical shells. Izvestiya of Saratov University. Mathematics. Mechanics. Informatics, 2022, vol. 22, iss. 2, pp. 196-204. DOI: 10.18500/1816-9791-2022-22-2-196-204, EDN: EAHYFO

This is an open access article distributed under the terms of Creative Commons Attribution 4.0 International License (CC-BY 4.0).
Published online: 
31.05.2022
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English
Heading: 
Mechanics
Article type: 
Article
UDC: 
534.1,517.95
DOI: 
10.18500/1816-9791-2022-22-2-196-204
EDN: 
EAHYFO

Generalized model of nonlinear elastic foundation and longitudinal waves in cylindrical shells

Autors: 
Zemlyanukhin Alexandr Isaevich, Yuri Gagarin State Technical University of Saratov
Bochkarev Andrey Vladimirovich, Yuri Gagarin State Technical University of Saratov
Ratushny Aleksandr Vasilyevich, Yuri Gagarin State Technical University of Saratov
Chernenko Aleksandr V., Yuri Gagarin State Technical University of Saratov
Abstract: 

A non-integrable quasi-hyperbolic sixth-order equation is derived that simulates the axisymmetric propagation of longitudinal waves along the generatrix of a cylindrical Kirchhoff – Love shell interacting with a nonlinear elastic medium. A six-parameter generalized model of a nonlinear elastic medium, which is reduced in particular cases to the models of Winkler, Pasternak, and Hetenyi, is introduced into consideration. The equation was derived by the asymptotic multiscale expansions method under the assumption that the dimensionless parameters of nonlinearity, dispersion, and thinness have the same order of smallness. The use of the introduced model made it possible to reveal additional high-frequency and low-frequency dispersions characterizing the response of the external environment to bending and shear. It is shown that non-classical shell theories should be used to reveal nonlinear effects that compensate for dispersion. It was found that the Pasternak model admits a  “dispersionless” state when the dispersion due to the inertia of normal displacement is compensated by the dispersion generated by the reaction of the nonlinear elastic foundation to shear.

Key words: 
cylindrical shell
axisymmetric waves
nonlinear elastic foundation
high-frequency dispersion
asymptotic integration
Acknowledgments: 
This work was supported by the Russian Foundation for Basic Research (project No. 20-01-00123).
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Received: 
29.11.2021
Accepted: 
29.12.2021
Published: 
31.05.2022
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