Abstract
For the analysis of wave propagation at high frequencies, the spectral finite element method is under investigation. In contrast to the conventional finite element method, high-order shape functions are used. They are composed of Lagrange polynomials with nodes at the Gauss–Lobatto–Legendre points. The Gauss–Lobatto–Legendre integration scheme is applied in order to obtain a diagonal mass matrix. The resulting system equations can be solved efficiently. In the numerical examples, spectral finite elements with shape functions of different order are applied to a plane strain problem. The numerical examples cover structures without and with stiffness discontinuities. It is shown that the results agree well with analytical and experimental solutions.
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Acknowledgments
This work is supported by the German Research Foundation (DFG) as part of the research project “PAK 357-Integrated Structural Health Monitoring in fibre composites through the examination of Lamb waves after excitation by piezoceramic plate actuators” which is gratefully acknowledged.
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Hennings, B., Lammering, R. & Gabbert, U. Numerical simulation of wave propagation using spectral finite elements. CEAS Aeronaut J 4, 3–10 (2013). https://doi.org/10.1007/s13272-012-0053-9
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DOI: https://doi.org/10.1007/s13272-012-0053-9