Wave field localization in a prestressed functionally graded layer
| Autor: | T. I. Belyankova, V. V. Kalinchuk |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Materials science Acoustics and Ultrasonics Cauchy distribution Mechanics 01 natural sciences Displacement (vector) Shear (sheet metal) Vibration symbols.namesake Distribution (mathematics) Hyperelastic material 0103 physical sciences Lamé function symbols 010301 acoustics Elastic modulus |
| Zdroj: | Acoustical Physics. 63:245-259 |
| ISSN: | 1562-6865 1063-7710 |
| Popis: | Characteristic features of wave field formation caused by a surface source of harmonic vibration in a prestressed functionally graded layer are investigated. It is assumed that the elastic moduli and the density of the material vary with depth according to arbitrary laws. The initial material of the medium is represented by a model hyperelastic material with third-order elastic moduli. The boundary-value problem for a set of Lame equations is reduced to a set of Cauchy problems with initial conditions, which is solved by the Runge–Kutta–Merson method modified to fit the specific problem under study. Considering shear vibrations of a functionally graded layer as an example, effects of the type of its inhomogeneity, variations in its properties, and nature of its initial stressed state on the displacement distribution in depth are investigated. Special attention is paid to characteristic features of displacement localization in a layer with an interface-type inclusion near critical frequencies. A direct relation between the inhomogeneous layer structure and the type of displacement localization in depth is demonstrated. It is found that the role of initial stresses and variations in material parameters considerably increases in the vicinities of critical frequencies. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|