Journal
INSIGHT
Volume 48, Issue 10, Pages 606-612Publisher
BRITISH INST NON-DESTRUCTIVE TESTING
DOI: 10.1784/insi.2006.48.10.606
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This paper discusses the studies undertaken to establish the limits of detectability of glue variations and defect detection in adhesively bonded canopy specimens used in fighter aircrafts, by low-energy radiography and thermal imaging techniques. The complementary nature of radiography and thermal imaging is also highlighted. From the results of the experiments, it is shown that low-energy radiography reveals volumetric defects such as porosities as small as 170 microns; thermal imaging is more sensitive to evaluate variations in glue content, having the capability of detection of variations in glue content of the order of 20%. Thermal imaging did not indicate the Presence of any major defects such as delaminations and debonds. While reflection and through-transmission-based thermal imaging techniques can be utilised for the detection of glue variations, the rate of change of temperature by transmission technique being higher, this can serve as a more sensitive indicator of glue variations, if both sides access is feasible.
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