Determination of trapped mode eigenfrequencies of an elastic plate with a strip-like delamination

Abstract

Abstract Resonance scattering of Lamb waves by strip-like interface delamination is investigated. Trapped mode resonance frequencies of the plate with interface delamination are experimentally studied via the application of the Fourier transform to point-wise measurements along a line obtained using laser Doppler vibrometry. Eigenfrequencies are also calculated employing semi-analytical and mesh-based computational methods. A good agreement between experimentally extracted and numerically predicted trapped mode eigenfrequencies is demonstrated.