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Sensors 2018, 18(1), 74; https://doi.org/10.3390/s18010074

A Concept of Thermographic Method for Non-Destructive Testing of Polymeric Composite Structures Using Self-Heating Effect

Institute of Fundamentals of Machinery Design, Silesian University of Technology, Konarskiego 18A, 44-100 Gliwice, Poland
Received: 15 November 2017 / Revised: 20 December 2017 / Accepted: 27 December 2017 / Published: 28 December 2017
(This article belongs to the Section Physical Sensors)
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Abstract

Traditional techniques of active thermography require an external source of energy used for excitation, usually in the form of high power lamps or ultrasonic devices. In this paper, the author presents an alternative approach based on the self-heating effect observable in polymer-based structures during cyclic loading. The presented approach is based on, firstly, determination of bending resonance frequencies of a tested structure, and then, on excitation of a structure with a multi-harmonic signal constructed from the harmonics with frequencies of determined resonances. Following this, heating-up of a tested structure occurs in the location of stress concentration and mechanical energy dissipation due to the viscoelastic response of a structure. By applying multi-harmonic signal, one ensures coverage of the structure by such heated regions. The concept is verified experimentally on artificially damaged composite specimens. The results demonstrate the presented approach and indicate its potential, especially when traditional methods of excitation with an external structure for thermographic inspection cannot be applied. View Full-Text
Keywords: self-heating effect; non-destructive testing; damage identification; vibration-based excitation; vibrothermography self-heating effect; non-destructive testing; damage identification; vibration-based excitation; vibrothermography
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Katunin, A. A Concept of Thermographic Method for Non-Destructive Testing of Polymeric Composite Structures Using Self-Heating Effect. Sensors 2018, 18, 74.

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