Please use this identifier to cite or link to this item:
http://hdl.handle.net/10397/95533
Title: | Purified nonlinear guided waves through a metamaterial filter for inspection of material microstructural changes | Authors: | Shan, S Wen, F Cheng, L |
Issue Date: | Sep-2021 | Source: | Smart materials and structures, Sept. 2021, v. 30, no. 9, 095017 | Abstract: | Nonlinear guided waves (NGWs) exhibit extraordinary sensitivity to microstructural changes in materials which are often considered as damage precursors in many structural health monitoring (SHM) applications. However, these changes are usually very small at the microstructural level, thus generating weak nonlinear wave components which are prone to or even overwhelmed by other deceptive and non-damage-related nonlinear sources present in a monitoring system. This may jeopardize the practical implementation of the NGW-based SHM methodology. To tackle this problem, this paper proposes a metamaterial filter (meta-filter (MF)), in the form of a patch to be surface-mounted over the structure under inspection. The MF is designed to purify the probing waves during propagation before reaching the inspection area through tactical elimination of non-damage-related nonlinear components from the actuation. Considering different bonding conditions and the lattice symmetry of the MF, two types of bandgaps, corresponding to Bragg scattering and local resonances, alongside their respective band properties are analyzed. Time-domain finite element simulations are carried out to assess the efficacy of the MF in terms of wave purification in the context of SHM, supported by experimental validations. The designed MF is deployed in an aluminum strip to detect the material microstructural changes induced by a thermal ageing treatment. Results demonstrate the designed MF significantly enhances the detection ability of NGW-based SHM system. Both locally resonant and Bragg bandgaps can, in principle, be used for wave purification. While the former requires precise control of the bonding quality of the MF, the latter relies on symmetrical installation of the MF to ensure a reasonably wide wave filtering range. Considering variability factors in the implementation of the MF and better immunity to the nonlinearity of the bonding layers, preference is given to Bragg bandgap for NGW-based SHM applications. | Keywords: | Bragg scattering Local resonance Metamaterial Nonlinear guided waves Structural health monitoring |
Publisher: | Institute of Physics Publishing | Journal: | Smart materials and structures | ISSN: | 0964-1726 | EISSN: | 1361-665X | DOI: | 10.1088/1361-665X/ac1955 | Rights: | © 2021 IOP Publishing Ltd This manuscript version is made available under the CC-BY-NC-ND 4.0 license (https://creativecommons.org/licenses/by-nc-nd/4.0/) The following publication Shan, S., Wen, F., & Cheng, L. (2021). Purified nonlinear guided waves through a metamaterial filter for inspection of material microstructural changes. Smart Materials and Structures, 30(9), 095017 is available at https://doi.org/10.1088/1361-665X/ac1955 |
Appears in Collections: | Journal/Magazine Article |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
Shan_Purified_Nonlinear_Guided.pdf | Pre-Published version | 5.03 MB | Adobe PDF | View/Open |
Page views
64
Last Week
0
0
Last month
Citations as of Sep 22, 2024
Downloads
111
Citations as of Sep 22, 2024
SCOPUSTM
Citations
18
Citations as of Sep 26, 2024
WEB OF SCIENCETM
Citations
15
Citations as of Sep 26, 2024
Google ScholarTM
Check
Altmetric
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.