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Numerical modeling and measurement by pulsed television holography of ultrasonic displacement maps in plates with through-thickness defects

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Numerical modeling and measurement by pulsed television holography of ultrasonic displacement maps in plates with through-thickness defects

López Vázquez, José Carlos; Deán Ben, José Luis; Trillo Yáñez, María Cristina; Fernández Doval, Ángel Manuel; Fernández Fernández, José Luis; Amlani, Faisal; Bruno, Oscar P.
 
DATE : 2010-09-01
UNIVERSAL IDENTIFIER : http://hdl.handle.net/11093/219
UNESCO SUBJECT : 3311.11 Instrumentos Opticos ; 2209.07 Holografía ; 2201.09 Ultrasonidos
DOCUMENT TYPE : article

ABSTRACT :

We present a novel numerical modeling of ultrasonic Lamb and Rayleigh wave propagation and scattering by through-thickness defects like holes and slots in homogeneous plates, and its experimental verification in both near and far field by a self-developed pulsed TV holography system. In contrast to rigorous vectorial formulation of elasticity theory, our model is based on the 2-D scalar wave equation over the plate surface, with specific boundary conditions in the defects and plate edges. The experimental data include complex amplitude maps of the out-of-plane displacements of the plate surface, obtained by a two-step spatiotemporal Fourier transform method. We find a fair match between the numerical and experimental results, which allows for quantitative characterization of the defects.

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