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Ultrasonic Detection of Delaminations in Composite Sandwich Panels Having Attenuation

Material attenuation is incorporated into a one dimensional wave propagation model of a polymeric composite sandwich panel via a d’Alembert traveling wave analysis to obtain exact solutions for any input waveform. Numerical results for a three layer sandwich panel subjected to a rectangular pulse indicate that the first wave packet reflected from the bottom surface of the core to the top surface is a key for detecting delamination of the lower face sheet. Delamination of the upper face sheet is also easily detectable. For cases where the attenuation is too high to allow reflected waves from within the panel to reach the top surface, displacement sensors could be embedded in

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