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FEM analysis of dispersive elastic waves in three-layered composite plates with high contrast properties.
- Source :
-
Finite Elements in Analysis & Design . Oct2021, Vol. 193, pN.PAG-N.PAG. 1p. - Publication Year :
- 2021
-
Abstract
- The limitations of the dynamic theories for the thin layered elastic structures, which very often have different physical and geometrical contrast properties of the layers in today's high-tech applications, bring a number of challenges in the numerical computation of the dynamic response. This is a strong motivation to develop a suitable computational methodology for accurate evaluation and implementation of the numerical results, aiming at accurate interpretation of the vibration spectra and the associated displacement and stress fields. In this paper, a newly developed numerical engineering approach is presented for the study of elastic wave dispersion in composite plates (sandwich plates) with high-contrast properties of the layers using modal finite element method (FEM) analysis implemented in commercial software. The obtained results are compared with the iterative numerical solution of the Rayleigh-Lamb dispersion equation for the fundamental flexural wave and the first shear harmonic. It is shown that the complexity of the dispersion phenomena, including the cut-off frequencies of higher order vibrational modes, has been captured very accurately and that the developed computational methodology provides a valuable insight into the frequency range in which the respective mode can be activated. This perspective shows a great potential of the approach to be employed in many engineering applications involving multi-layered structures with arbitrary number of layers. • Lamb wave dispersion in high-contrast three-layered composite plates is studied. • Numerical engineering approach to analyze wave dispersion phenomena is developed. • Frequency ranges in which the respective mode can be activated are determined. • The dispersion curves and the cut-off frequencies are captured very accurately. • The approach enables to separate fundamental flexural mode and first shear mode. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 0168874X
- Volume :
- 193
- Database :
- Academic Search Index
- Journal :
- Finite Elements in Analysis & Design
- Publication Type :
- Academic Journal
- Accession number :
- 150815134
- Full Text :
- https://doi.org/10.1016/j.finel.2021.103553