Abstract
Due to the growing interest to apply sandwich composites in various industrial fields, more and more attention is paid to the development novel non-destructive testing (NDT) techniques, which will be suitable for detection, precise localization and identification of damages characteristic for these materials. In this study the author proposed novel approach of two-step damage detection and evaluation, which consisted of the non-contact vibration analysis and extraction of modal shapes of vibration and then an advanced signal processing algorithm, which is based on 2D signal decomposition using 2D wavelet transform (WT) with B-spline wavelets of fractional order. The damage identification procedure was performed on the honeycomb-core sandwich composite plates, which consisted of all types of damages typical for such structures during their operation (delaminations, cracks of a core and face sheets, impact damages, etc.). Results show that the proposed method can successfully detect, localize and identify the different types of damages.
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