18 January 1985 The Deformation Analysis Of Transversely Struck Isotropic And Anisotropic Plates By Using The Holographic Double Exposure Technique
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Proceedings Volume 0473, Symposium Optika '84; (1985) https://doi.org/10.1117/12.942391
Event: Symposium Optika '84, 1984, Budapest, Hungary
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.
© (1985) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
H. Schwieger, R. Streubel, "The Deformation Analysis Of Transversely Struck Isotropic And Anisotropic Plates By Using The Holographic Double Exposure Technique", Proc. SPIE 0473, Symposium Optika '84, (18 January 1985); doi: 10.1117/12.942391; https://doi.org/10.1117/12.942391
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