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12 May 2015 Comparative evaluation of aerospace composites using thermography and ultrasonic NDT techniques
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In the present research work a study was carried out evaluating the applicability of two NDT techniques, this of Transient Thermography (TT) and Ultrasonic Testing (UT) for the inspection of different types of composite materials (i.e. laminated CFRPs, laminated hybrid FRPs and sandwiched panels). The composite structures were consisted of a variety of artificial defects, while inspection was performed through different testing configurations. In particular, transient thermography was implemented through the monitoring of the surface transient cooling after flash heating the samples and ultrasonic testing was applied using both a conventional single element probe (immersion technique) and a linear phased array transducer consisted of 128 elements. The main objective of this work was to compare the applicability and effectiveness of the two techniques in aerospace composites inspection as well as to evaluate the accuracy produced regarding the quantitative characterisation of the detected features. The obtained results showed that all the defects were revealed by either transient thermography or ultrasonic testing, whilst thermographic inspection can display the acquired results in a more rapid manner. On the other hand UT testing can provide efficient results for deeper probing requiring however longer inspection times. In other words, the acquired data and the respective analyses highlighted the different capability of each testing configuration, to detect defects and to gain knowledge for the interior of the structures.
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P. Theodorakeas, N. P. Avdelidis, I. Hatziioannidis, E. Cheilakou, R. Marini, and M. Koui "Comparative evaluation of aerospace composites using thermography and ultrasonic NDT techniques", Proc. SPIE 9485, Thermosense: Thermal Infrared Applications XXXVII, 948504 (12 May 2015);

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