Abstract
This paper investigates the inspection and testing of internal structural damages in Honeycomb Sandwich composites by means of pulsed thermography experiments. The voids, delamination flaws, and epoxy-filled defects are also studied using numerical simulation in 3D FEM using COMSOL Multiphysics. Pulse thermography data processing methods such as Thermographic Signal Reconstruction (TSR) techniques, Pulse Phase Thermography (PPT) and Principle Component Analysis(PCA) were used to analyse the simulated and experimental data. Standard samples made of Nomex and fiberglass cores, both of which had identical flaws, were studied. The potted core defect, filled with epoxy, and the pillow insert (delamination)located in the front face plate of the composite could be clearly identified from the thermograms as well as the TSR results.On the contrary, the machined core defects showed very minute contrast and are more difficult to be identified
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