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THE PROPAGATION CHARACTERISTICS OF LEAKY LAMB WAVE AND APPLICATION FOR RESIN IMPREGNATION MONITORING

The leaky Lamb wave has a broad application prospect in the fields of biosensing, concrete construction, composite material manufacturing, and so on. This paper first theoretically investigates the propagation characteristics of leaky Lamb waves when the rigid mold is loaded with water or viscous resin by one side in the semi-infinite space. As the thickness of the liquid increases, more and more energy leaks into the liquid through the solid-liquid interface. There is more energy leaking into the viscous resin than that in the water. The phase velocity and energy velocity decrease as the liquid increases. Then the amplitude reduction and phase delay of A0 mode due to the liquid loading from theoretical analysis were verified by subsequent experiments. One valid application of leaky Lamb waves in resin impregnation monitoring during the Vacuum Assisted Resin Infusion of composite materials manufacturing process was also investigated experimentally.