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Imaging of barely visible impact damage on a composite panel using nonlinear wave modulation thermography

Dionysopoulos, Dionysopoulos,, Fierro, Gian-Piero Malfense, Meo, Michele and Ciampa, Francesco (2018) Imaging of barely visible impact damage on a composite panel using nonlinear wave modulation thermography NDT & E International, 95. pp. 9-16.

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Abstract

Thermosonics is a well-established non-destructive evaluation (NDE) technique that uses an infrared camera to visualise material damage by capturing the frictional heating at crack surfaces when the sample under inspection is vibrated. A high power ultrasonic horn is typically used to generate vibrations, which is pressed against the surface of the test component. However, the direct contact between the horn and the surface generates acoustic chaos and high-amplitude vibrations, which can lead to non-reproducible and unreliable measurements and, ultimately, they can harm the structural integrity of components. This paper proposes an alternative to thermosonics, here named as nonlinear wave modulation thermography, for the detection and imaging of material flaws on a damaged carbon fibre composite panel. This material inspection technology combines the concept of nonlinear wave modulation spectroscopy using dual excitation with contact piezoelectric transducers and thermographic equipment. Whilst nonlinear ultrasonic modulation was used to enhance the sensitivity to micro-cracks, an infrared camera was used for defect visualisation. A nonlinear narrow sweep excitation method was employed to experimentally identify the dual excitation frequencies that resulted in high-amplitude damage resonance effects causing frictional heat at crack surfaces. A laser vibrometry system was also used to create a spatial mapping of the amplitude of sidebands. Nonlinear wave modulation thermography has proved to successfully detect barely visible impact damage in composites in a quick and reliable manner, thus overcoming the limitations of traditional optical thermography and thermosonics. © 2018 Elsevier Ltd

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Authors :
NameEmailORCID
Dionysopoulos, Dionysopoulos,
Fierro, Gian-Piero Malfense
Meo, Michele
Ciampa, Francescof.ciampa@surrey.ac.uk
Date : April 2018
Funders : EPSRC - Engineering and Physical Sciences Research Council
DOI : 10.1016/j.ndteint.2018.01.005
Copyright Disclaimer : © 2018 Elsevier Ltd. All rights reserved.
Uncontrolled Keywords : Thermosonics; Thermography; Nonlinear ultrasounds; Laser vibrometry; Composites
Depositing User : Diane Maxfield
Date Deposited : 16 Sep 2019 13:37
Last Modified : 16 Sep 2019 13:37
URI: http://epubs.surrey.ac.uk/id/eprint/852618

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