Investigation of Surface Damages in Composite Materials Using Ultrasonic Lamb Waves

Abstract

In this research, it was aimed to figure out the damages in composite materials using the air-coupled ultrasonic method. The ultrasonic lamb waves were used to obtain C-scan images of damaged materials. A couple of planar air-coupled transducers (500 kHz-Ultran Group-USA), and an air-coupled scanning system (MISTRAS-EPA, France) were used for obtaining the data from the surfaces of materials used in this research. These transducers were located at different incidence angles for obtaining the lamb waves. The data obtained as A-scan signals was saved in txt data. This data was processed with the MATLAB codes for drawing C-scan images of the surfaces of materials. The results obtained from this research showed that the surface damages in composite materials can be characterized by using ultrasonic lamb waves.

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