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Open AccessArticle

Nondestructive Analysis of Debonds in a Composite Structure under Variable Temperature Conditions

1
Institute of Fluid-Flow Machinery, Polish Academy of Sciences, 14, Fiszera Street, 80-231 Gdansk, Poland
2
Cardiff School of Engineering, Cardiff University, The Parade, Queen’s Building, Cardiff CF24 3AA, UK
3
Department of Structural Mechanics, Ignacy Lukasiewicz Rzeszów University of Technology, 2 Poznańska Street, 35-959 Rzeszów, Poland
*
Author to whom correspondence should be addressed.
Sensors 2019, 19(16), 3454; https://doi.org/10.3390/s19163454
Received: 4 July 2019 / Revised: 1 August 2019 / Accepted: 3 August 2019 / Published: 7 August 2019
(This article belongs to the Section Physical Sensors)
This paper presents a nondestructive analysis of debonds in an adhesively-bonded carbon-fibre reinforced composite structure under variable temperature conditions. Towards this, ultrasonic guided wave propagation based experimental analysis and numerical simulations are carried out for a sample composite structure to investigate the wave propagation characteristics and detect debonds under variable operating temperature conditions. The analysis revealed that the presence of debonds in the structure significantly reduces the wave mode amplitudes, and this effect further increases with the increase in ambient temperature and debond size. Based on the debond induced differential amplitude phenomenon, an online monitoring strategy is proposed that directly uses the guided wave signals from the distributed piezoelectric sensor network to localize the hidden debonds in the structure. Debond index maps generated from the proposed monitoring strategy show the debond identification potential in the adhesively-bonded composite structure. The accuracy of the monitoring strategy is successfully verified with non-contact active infrared-thermography analysis results. The effectiveness of the proposed monitoring strategy is further investigated for the variable debond size and ambient temperature conditions. The study establishes the potential for using the proposed damage index constructed from the differential guided wave signal features as a basis for localization and characterization of debond damages in operational composite structures. View Full-Text
Keywords: adhesive bonds; carbon-fibre composites; debond; guided wave; infrared-thermography; piezoelectric transducer adhesive bonds; carbon-fibre composites; debond; guided wave; infrared-thermography; piezoelectric transducer
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Sikdar, S.; Kundu, A.; Jurek, M.; Ostachowicz, W. Nondestructive Analysis of Debonds in a Composite Structure under Variable Temperature Conditions. Sensors 2019, 19, 3454.

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