Experimental determination of dispersion diagrams over large frequency ranges for guided ultrasonic waves in fiber metal laminates
Publication date
2023-06-30
Document type
Forschungsartikel
Author
Wiedemann, Johannes
Roloff, Thomas
Behrens, Tim
Hühne, Christian
Sinapius, Michael
Lammering, Rolf
Organisational unit
Publisher
IOP Publishing
Series or journal
Smart Materials and Structures
ISSN
Periodical volume
32
Periodical issue
8
Article ID
085011
Peer-reviewed
✅
Part of the university bibliography
✅
Language
English
Abstract
Fiber metal laminates (FMLs) are of high interest for lightweight structures as they combine the advantageous material properties of metals and fiber-reinforced polymers (FRPs). However, low-velocity impacts can lead to complex internal damage. Therefore, structural health monitoring with guided ultrasonic waves (GUWs) is a methodology to identify such damage. Numerical simulations form the basis for corresponding investigations, but experimental validation of dispersion diagrams over a wide frequency range is hardly found in the literature. In this work the dispersive relation of GUWs is experimentally determined for an FML made of carbon FRP and steel. For this purpose, multi-frequency excitation signals are used to generate GUWs and the resulting wave field is measured via laser scanning vibrometry. The data are processed by means of a non-uniform discrete 2d Fourier transform and analyzed in the frequency-wavenumber domain. The experimental data are in excellent agreement with data from a numerical solution of the analytical framework. In conclusion, this work presents a highly automatable method to experimentally determine dispersion diagrams of GUWs in FML over large frequency ranges with high accuracy.
Description
Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 license (https://creativecommons.org/licenses/by/4.0/).
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