title: Inverse characterization of plates using zero group velocity Lamb modes.
abstract: In the presented work, the characterization of plates using zero group velocity Lamb modes is discussed. First, analytical expressions are shown for the determination of the k-ω location of the zero group velocity Lamb modes as a function of the Poisson's ratio. The analytical expressions are solved numerically and an inverse problem is formulated to determine the unknown wave velocities in plates of known thickness. The analysis is applied to determine the elastic properties of tungsten and aluminum plates based on the experimentally measured frequency spectra.
authors.affiliation: Research Center for Non-Destructive Testing GmbH (RECENDT), Altenberger Str. 69, 4040 Linz, Austria.
authors.forename: Clemens
authors.initials: C
authors.lastname: Grünsteidl
authors.affiliation: Department of Mechanical Engineering, University of Colorado at Boulder, 427 UCB Engineering Center, Boulder, CO 80309, USA.
authors.forename: Todd W
authors.initials: TW
authors.lastname: Murray
authors.affiliation: Research Center for Non-Destructive Testing GmbH (RECENDT), Altenberger Str. 69, 4040 Linz, Austria.
authors.forename: Thomas
authors.initials: T
authors.lastname: Berer
authors.affiliation: Research Center for Non-Destructive Testing GmbH (RECENDT), Altenberger Str. 69, 4040 Linz, Austria. Electronic address: istvan.veres@recendt.at.
authors.forename: István A
authors.initials: IA
authors.lastname: Veres
keywords: Inverse problem; Laser-ultrasound; Zero group velocity Lamb waves