Author, institution: Almantas Vilpišauskas, Kauno University of Technology
Scientific Supervisor: Prof. Dr. Habil. Rymantas Jonas Kažys (Kaunas University of Technology, Technological Sciences, Electrical and Electronics Engineering, 01T).
Science area, field: Technological Sciences, Electrical and Electronics Engineering, 01T
The Doctoral Dissertation is available at the library of Kaunas University of Technology (K. Donelaičio St. 20, Kaunas)
Dissertation Defence Board of Electrical and Electronics Engineering Science Field:
Prof. Dr. Vaidotas Marozas (Kaunas University of Technology, Technological Sciences, Electrical and Electronics Engineering, 01T) – chairman;
Prof. Dr. Daumantas Čiplys (Vilnius University, Physical Sciences, Physics – 02P);
Prof. Dr. Darius Gailius (Kaunas University of Technology, Measurement Engineering, 10T);
Prof. Dr. Habil. Tamara Kujawska (Institute of Fundamental Technological Research of the Polish Academy of Sciences, Poland, Technological Sciences, Electrical and Electronics Engineering, 01T);
Prof. Dr. Renaldas Raišutis (Kaunas University of Technology, Technological Sciences, Electrical and Electronics Engineering, 01T).
Annotation:
The contemporary industry manufactures a lot of items based on differently shaped plate structures. Lamb (or guided) waves are widely applied in NDT&E (Non Destructive Testing and Evaluation) of these plate structures. A new air-coupled slow A0 Lamb wave mode excitation method by using matched size phased ultrasonic array has been created. The pitch of the matched size phased array is equal to the Lamb wavelength in the material under the test. By applying the new air-coupled method, the slow A0 Lamb wave mode can be excited in plastic films when the A0 Lamb wave mode phase velocity is lower than the sound velocity in the air.
