Abstract
Geometry effects can strongly influence the resonance frequency and defect detectability for impact echo testing when lateral dimensions are small compared to the thickness of the testing object. Since there is a lack of understanding of these effects, it is the aim of this study to review the impact echo testing method using modal analysis. The comparison between measurements on reference specimens and numerical simulations reveals that the eigenmodes of the structure cause these geometry effects. Especially those eigenmodes show large amplitudes in impact echo data, in which the motion amplitude is not modulated in thickness direction. Upon further investigation of the eigenfrequencies with 3D numerical simulations, two different inversion schemes are developed to obtain the Poisson's ratio from impact echo measurements. The results are in good agreement with experimental results from the used reference specimens.
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