12 April 2004 Thermal transient thermographic NDT and E of composites
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Abstract
The necessity for more efficient and cost effective aircraft has led in the development of innovative testing and evaluation techniques. Smart and cost effective methods for evaluating the integrity of aircraft structures are necessary to both reduce manufacturing costs and out of service time of aircraft due to maintenance. Nowadays, thermal non-destructive testing and evaluation (NDT & E) techniques are frequently used in the effective assessment of composites. Such techniques are non-contact; the investigated material is heated or cooled by an external stimulus source (flash lamps, air gun, etc) and the resulting thermal transient at the surface is monitored using an infrared - thermal camera. This paper presents certain applications of thermal transient techniques relating to the investigation of composites. Different features or defects were studied: (i) notches, delaminations and fibre optics under multi-ply composite patching (bonded with FM73 adhesive film to the surface of Al 2024-T3), (ii) drilling induced defects on multi-ply laminates of HEXCEL AS4/8552 carbon fibre composites and (iii) impact damage on carbon fibre reinforced plastic (CFRP) panels and honeycomb sandwich structures (bonded with AF-163-2U.03 adhesive film). The approaches used in this study, provided first-rate results in all cases.
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Nicolas P. Avdelidis, Nicolas P. Avdelidis, Darryl P. Almond, Darryl P. Almond, A. Dobbinson, A. Dobbinson, B. Hawtin, B. Hawtin, Clemente Ibarra-Castanedo, Clemente Ibarra-Castanedo, Xavier P. Maldague, Xavier P. Maldague, } "Thermal transient thermographic NDT and E of composites", Proc. SPIE 5405, Thermosense XXVI, (12 April 2004); doi: 10.1117/12.549901; https://doi.org/10.1117/12.549901
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