Title: Nonlinear wave structural health monitoring method using an active nonlinear piezoceramic sensor for matrix cracking detection in composites
Authors: CHRYSOCHOIDIS NIKOLAOSASSIMAKOPOULOU TheoniSARAVANOS Dimitris
Citation: JOURNAL OF INTELLIGENT MATERIAL SYSTEMS AND STRUCTURES vol. 26 no. 15 p. 2108–2120
Publisher: SAGE PUBLICATIONS LTD
Publication Year: 2015
JRC N°: JRC79979
ISSN: 1045-389X
URI: http://jim.sagepub.com/content/26/15/2108
http://publications.jrc.ec.europa.eu/repository/handle/JRC79979
DOI: 10.1177/1045389X14549865
Type: Articles in periodicals and books
Abstract: A structural health monitoring methodology, based on nonlinear wave modulation spectroscopy, is presented and aims to detect matrix cracks in composites. Experiments were conducted on cross-ply carbon/epoxy strips containing matrix cracks, induced via three-point bending. Damage in all tested specimens was categorized according to the acoustic emission hits recorded during loading. The nonlinear ultrasonics methodology is applied via an active nonlinear acoustoultrasonic piezoelectric sensor, enabling low-cost and wide-frequency operational bandwidth. This active sensor configuration involves two piezoceramic wafer actuators, one excited with a low- and the other with a high-frequency signal, and a piezoceramic sensor, all permanently bonded on the tested structure. The sensitivity of the nonlinear active sensor response at specific high carrier frequencies is depicted and damage indices are proposed. The experimental results illustrate the effectiveness of the nonlinear ultrasonic wave mixing method in matrix crack detection, as well as the potential of the new active sensor for permanent structural health monitoring.
JRC Directorate:Space, Security and Migration

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