Variable separation method for solving boundary value problems of isotropic linearly viscoelastic bodies

• Published in: Acta mechanica 2020-09, Vol.231 (9), p.3583-3606
• Main Authors: Svetashkov, A. A., Kupriyanov, N. A., Pavlov, M. S., Vakurov, A. A.
• Format: Article
• Language: English
• Subjects: Aerospace engineering; Algorithms; Boundary value problems; Classical and Continuum Physics; Construction engineering; Control; Dynamical Systems; Elastic properties; Engineering; Engineering Fluid Dynamics; Engineering Thermodynamics; Heat and Mass Transfer; Load history; Original Paper; Solid Mechanics; Strain; Theoretical and Applied Mechanics; Vibration; Viscoelasticity
• ISSN: 0001-5970; 1619-6937
• DOI: 10.1007/s00707-020-02698-4

The availability of accurate methods to mathematically model and predict the behavior of viscoelastic structures under mechanical, thermal and other loads remains a critical issue in different fields ranging from construction engineering to aerospace. Methods to calculate elastic structures are well developed; however, considering that viscoelastic properties require significant effort, we have developed and tested a new analytical method to solve boundary problems of isotropic linearly viscoelastic bodies. According to the proposed algorithm, to find the solution for a linear viscoelasticity boundary problem, we must replace the elastic constants with some functions of time and then numerically or analytically calculate the stress–strain state of the structure at any moment of its loading history. As a result of the theoretical justification of the proposed method, carried out in three independent ways, identical expressions of effective modules are obtained. The obtained results, as well as testing on solutions to several problems, allow us to conclude that the new analytical method is applicable to the calculation of the stress–strain state of viscoelastic bodies.