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Proceedings Paper

Wave Propagation In Plates Studied By Pulsed Hologram Interferometry
Author(s): A. Wahlin; K-E Fallstrom; H. Gustaysson; N-E Molin
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Paper Abstract

Isotropic and non-isotropic plates are impacted by a ballistic pendulum. The bending waves that are generated are studied with holographic interferometry using a double pulsed ruby laser as light source. The pulse shape changes with time because of the dispersivity of the waves. Initially the fringe pattern in the isotropic case is cylindrically symmetric and determined from an initial value problem. Later, when the waves have reached the plate rim, in-and outgoing waves gradually develop fringe patterns which in the end will be a combination of eigenmodes of the plate. A solution to the corresponding Kirchhoff plate equation is presented, which in the special case when the impact is modelled as a Dirac-pulse in space and time, is shown to depend only of the distance to the impact point divided by the square root of the time after impact and a parameter containing plate parameters. From the slope of the central deflection material parameters can be determined. Another solution, assuming a finite inpact time, is shown to agree better with experiments. Results from investigations of non-isotropic materials are also presented.

Paper Details

Date Published: 5 July 1989
PDF: 8 pages
Proc. SPIE 1038, 6th Mtg in Israel on Optical Engineering, (5 July 1989); doi: 10.1117/12.951044
Show Author Affiliations
A. Wahlin, Lulea University of Technology (Sweden)
K-E Fallstrom, Lulea University of Technology (Sweden)
H. Gustaysson, Lulea University of Technology (Sweden)
N-E Molin, Lulea University of Technology (Sweden)

Published in SPIE Proceedings Vol. 1038:
6th Mtg in Israel on Optical Engineering
Rami Finkler; Joseph Shamir, Editor(s)

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