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Wave propagation in plates studied by pulsed hologram interferometry
Luleå University of Technology, Department of Engineering Sciences and Mathematics.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.
1989 (English)In: The Sixth Meeting in Israel on Optical Engineering: proceedings : 19-21 December 1988, Tel Aviv, Israel / [ed] Rami Finkler; Joseph Shamir, Bellingham, Wash: SPIE - International Society for Optical Engineering, 1989, p. 146-53Conference paper, Published paper (Refereed)
Abstract [en]

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 impact time, is shown to agree better with experiments. Results from investigations of non-isotropic materials are also presented.

Place, publisher, year, edition, pages
Bellingham, Wash: SPIE - International Society for Optical Engineering, 1989. p. 146-53
Series
Proceedings of SPIE, the International Society for Optical Engineering, ISSN 0277-786X ; 1038
National Category
Applied Mechanics Fluid Mechanics and Acoustics
Research subject
Experimental Mechanics; Fluid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-40583Local ID: fc36dae0-a331-11db-8975-000ea68e967bOAI: oai:DiVA.org:ltu-40583DiVA, id: diva2:1014105
Conference
Meeting in Israel on Optical Engineering : 19/12/1988 - 21/12/1988
Note
Godkänd; 1989; 20070113 (ysko)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2017-11-25Bibliographically approved

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Wåhlin, AndersFällström, Karl-EvertGustavsson, HåkanMolin, Nils-Erik

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