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Comparative Study of Active Thermography Techniques for the Nondestructive Evaluation of Honeycomb Structures

2009; Taylor & Francis; Volume: 20; Issue: 1 Linguagem: Inglês

10.1080/09349840802366617

1432-2110

Clemente Ibarra‐Castanedo, Jean-Marc Piau, Stéphane Guilbert, Nicolas P. Avdelidis, Marc Genest, Abdelhakim Bendada, Xavier Maldague,

Calibration and Measurement Techniques

Abstract In this article, the theoretical and experimental aspects of three active thermography approaches: pulsed thermography (PT), lock-in thermography (LT), and vibrothermography (VT), are discussed in relation to the nondestructive evaluation (NDE) of honeycomb sandwich structures. For this purpose, two standard specimens with simulated defects (delaminations, core unbonds, excessive adhesive, and crushed core) were tested, and results were processed, examined, and compared. As will be pointed out, the similarities and differences between these active approaches allow conclusions to be made about the most suitable approach for a particular application. In addition, results from NDE inspection by X-rays and c-scan ultrasounds are provided and discussed for reference. Keywords: active infrared thermographyhoneycomb sandwich structurespulsed thermographyvibrothermography ACKNOWLEDGMENTS This work has been supported by the grant from the Canada Research Program (CRC): Multipolar Infrared Vision Canada Research Chair (MiViM). Acknowledgments are attributed to TWI's Technology Centre in South Wales, UK as part of this research study was completed in the NDT Centre; to Harold Hebert who kindly agree to perform the c-scan tests over one of the samples at the Industrial Materials Institute in Boucherville, Quebec; and to the National Research Council of Canada for its financial support.