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Proceedings Paper

The Deformation Analysis Of Transversely Struck Isotropic And Anisotropic Plates By Using The Holographic Double Exposure Technique
Author(s): H. Schwieger; R. Streubel
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Paper Abstract

As a contribution to systematic investigations of the mechanical behaviour of struck elements, the holographic double exposure technique was used to study the dynamic response of isotropic plates and such with natural and structural anisotropy. Further, the propagation of elastic bending waves was investigated. The whole arrangement has been designed to test large plates in order to study the so called "early state", which is not influenced by the reflected waves coming back from the boundaries to the impact region. Thus, in the studied cases the maximum loading below the impact point took place within the early state. A double pulsed ruby laser with a concave expanding lens was used to illuminate the large-sized object surface, whereby the laser was controlled by the falling impact mass (steel ball), so that the first flash was triggered before the impact and the second one in desired time intervals after the beginning of contact. For studying the different deformation states, comprehensive series of moment photographs with circularly and elliptically shaped interference fringes were produced characterizing the loci of equal displacement. Especially the photographs of a stiffened duraluminium plate show an interesting distribution of the interference fringes. The higher vibration modes of a rolled brass plate were also visualized and illustrate the mechanical properties of this anisotropic material.

Paper Details

Date Published: 18 January 1985
PDF: 4 pages
Proc. SPIE 0473, Symposium Optika '84, (18 January 1985); doi: 10.1117/12.942391
Show Author Affiliations
H. Schwieger, Ruhr-Universitat Bochum (Germany)
R. Streubel, Ruhr-Universitat Bochum (Germany)

Published in SPIE Proceedings Vol. 0473:
Symposium Optika '84
Gabor Lupkovics; Andras Podmaniczky, Editor(s)

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