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An Analytical Model for Defect Depth Estimation Using Pulsed Thermography

Angioni, S.L., Ciampa, F., Pinto, F., Scarselli, G., Almond, D.P. and Meo, M. (2016) An Analytical Model for Defect Depth Estimation Using Pulsed Thermography EXPERIMENTAL MECHANICS, 56 (6). pp. 1111-1122.

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Abstract

The use of pulsed thermography as a non-destructive evaluation tool for damage monitoring of composite materials has dramatically increased in the past decade. Typically, optical flashes are used as external heating sources, which may cause poor defect definition especially for thicker materials or multiple delaminations. SMArt thermography is a new alternative to standard pulsed thermography as it overcomes the limitations on the use of external thermal sources. Such a novel technology enables a built-in, fast and in-depth assessment of both surface and internal material defects by embedding shape memory alloy wires in traditional carbon fibre reinforced composite laminates. However, a theoretical model of thermal wave propagation for SMArt thermography, especially in the presence of internal structural defects, is needed to better interpret the observations/data measured during the experiments. The objective of this paper was to develop an analytical model for SMArt thermography to predict the depth of flaws/damage within composite materials based on experimental data. This model can also be used to predict the temperature contrast on the surface of the laminate, accounting for defect depth, size and opening, thermal properties of material and defect filler, thickness of the component, and intensity of the excitation energy. The results showed that the analytical model gives good predictions compared to experimental data. This paper is one of the first pioneering work showing the use thermography as a quantitative non-destructive tool where defect size and depth could be assessed with good accuracy.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Authors :
NameEmailORCID
Angioni, S.L.
Ciampa, F.f.ciampa@surrey.ac.uk
Pinto, F.
Scarselli, G.
Almond, D.P.
Meo, M.
Date : 21 March 2016
DOI : 10.1007/s11340-016-0143-4
Copyright Disclaimer : © The Author(s) 2016. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http:// creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
Uncontrolled Keywords : Composite materials; Pulsed thermography; Embedded shape memory alloy wires ; Analytical methods; Defect depth; Thermal properties
Depositing User : Diane Maxfield
Date Deposited : 17 Sep 2019 08:50
Last Modified : 17 Sep 2019 08:50
URI: http://epubs.surrey.ac.uk/id/eprint/852628

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