Title: Guided wave time-reversal imaging of macroscopic localized inhomogeneities in anisotropic composites
Authors: Eremin, Artem
Glushkov, Evgeny
Glushkova, Natalia
Lammering, Rolf
Language: eng
Keywords: Anisotropy;Sensor Network;Structural Health Monitoring
Issue Date: 2019
Publisher: Sage Publications
Document Type: Article
Source: Enthalten in: Structural health monitoring. - Thousand Oaks, Calif. : Sage Publications, 2002. - Online-Ressource. - Bd. 18.2019, insges. 17 S.
Journal / Series / Working Paper (HSU): Structural Health Monitoring
Volume: 18
Issue: 5-6
Page Start: 1803
Page End: 1819
Publisher Place: Thousand Oaks, Calif.
Estimation of damage position and extent in the inspected structure is among the emerging problems of active structural health monitoring (SHM) with elastic guided waves. Unlike conventional non-destructive testing (NDT) techniques, which assume continuous surface scanning, SHM systems operate only with data from a limited number of sensors. Nevertheless, in the case of isotropic (metal) plate-like structures, computational time-reversal techniques have proved to be effective for estimating in situ the location and size of wave sources and/or local scatterers within the SHM concept. With composite plates, the reconstruction procedure faces additional difficulties associated with the complexity of wave phenomena caused by their lamination and anisotropy. In this article, we present an extension of the time reversal technique for the case of composite laminate plate-like structures. This technique relies on the simulation of the reversed guided waves generated by reciprocal surface loads applied at a sparse set of measurement points of a real sensor network. The proposed implementation is based on the far-field asymptotics for guided waves generated in arbitrarily anisotropic laminate waveguides by a prescribed source, which have been derived from the path integral representations in terms of Green’s matrix for the structures considered. The performance of this approach has been experimentally tested on cross-ply carbon fiber-reinforced plastic plates showing reliable and adequate results for both active (piezoactuators) and passive (artificial defects) source characterization. © The Author(s) 2019.
Organization Units (connected with the publication): Mechanik 
ISSN: 1475-9217
Publisher DOI: 10.1177/1475921719830612
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