Unsteady bending function for an unlimited anisotropic plate

This work is devoted to the study of non-stationary vibrations of a thin anisotropic unbounded Kirchhoff plate under the influence of random non-stationary loads. The approach to the solution is based on the principle of superposition and the method of influence functions (the so-called Green functi...

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Bibliographic Details
Published in:	Vestnik Samarskogo gosudarstvennogo tehničeskogo universiteta. Seriâ Fiziko-matematičeskie nauki Vol. 25; no. 1; pp. 111 - 126
Main Authors:	Alexander O. Serdiuk, Dmitry O. Serdiuk, Grigory V. Fedotenkov
Format:	Journal Article
Language:	English Russian
Published:	Samara State Technical University 01-03-2021
Subjects:	anisotropic material green's function integral transforms kirchhoff plate non-stationary deflection non-stationary dynamics quadrature formulas rapidly oscillating functions rectangle method
Online Access:	Get full text
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Summary:	This work is devoted to the study of non-stationary vibrations of a thin anisotropic unbounded Kirchhoff plate under the influence of random non-stationary loads. The approach to the solution is based on the principle of superposition and the method of influence functions (the so-called Green functions), the essence of which is to link the desired solution to the load using an integral operator of the type of convolution over spatial variables and over time. The convolution core is the Green function for the anisotropic plate, which represents normal displacements in response to the impact of a single concentrated load in coordinates and time, mathematically described by the Dirac delta functions. Direct and inverse integral transformations of Laplace and Fourier are used to construct the Green function. The inverse integral Laplace transform is found analytically. The inverse two-dimensional integral Fourier transform is found numerically by integrating rapidly oscillating functions. The obtained fundamental solution allowed us to present the desired non-stationary deflection in the form of a triple convolution in spatial coordinates and time of the Green function with the non-stationary load function. The rectangle method is used to calculate the convolution integral and construct the desired solution. The found deflection function makes it possible to study the space-time propagation of non-stationary waves in an unbounded Kirchhoff plate for various versions of the symmetry of the elastic medium: anisotropic, orthotropic, transversally isotropic, and isotropic. Examples of calculations are presented.
ISSN:	1991-8615 2310-7081
DOI:	10.14498/vsgtu1793