The Guided Ultrasonic Wave Oscillation Phase Relation between the Surfaces of Plate-like Structures of Different Material Settings

Lamb waves occur in thin-walled structures two wave modes—the symmetric and the antisymmetric mode. Their oscillation on structures‘ surfaces is either phase (symmetric) or shifted by a angle of ? (antisymmetric). In this work, method developed which to compare surfaces’ relation answer question whether fiber metal laminates show same surface behavior as described for metals. The evaluation time signals regarding instantaneous performed using continuous wavelet transformation short-time Fourier transformation. Numerical simulations utilizing finite element provide from top bottom different material settings configurations. numerically obtained are evaluated methods with respect phase. Subsequently, experimentally propagation laminate. It shown that based suitable relations signals. Additionally, it proven only relations, indicates occurrence waves.