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Proceedings Paper

Fast Detection Of Residual Stresses By Shearography
Author(s): M. Y. Y. Hung; K. W. Long; X. Zhang; J. D . Hovanesian; R. Hathaway
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Paper Abstract

A modified shearographic (speckle-shearing) method for the rapid detection of residual stress in elastic engineering materials and components has been introduced. A coherent monochromatic light source (laser) is required to enable interference fringes to appear in the recording medium as a result of path length changes occurring between the two separate exposures during the evaluation. The path length change is a function of the objects surface displacement. The method employs a special image-shearing camera permitting quasi-full field measurement of surface displacement. A surface displacement, which occurs due to altering the specimen surface in the test area between the two exposures of a double exposure method, produces a fringe pattern which is visible using a high-pass Fourier filtering device. The viewed fringe pattern is directly related to stresses that are changed due to the surface alteration. The stresses altered are those present due to either a live-load or those resident in the specimen.

Paper Details

Date Published: 14 December 1988
PDF: 11 pages
Proc. SPIE 0955, Industrial Laser Interferometry II, (14 December 1988); doi: 10.1117/12.947662
Show Author Affiliations
M. Y. Y. Hung, Oakland University (United States)
K. W. Long, Oakland University (United States)
X. Zhang, Oakland University (United States)
J. D . Hovanesian, Oakland University (United States)
R. Hathaway, Western Michigan University (United States)

Published in SPIE Proceedings Vol. 0955:
Industrial Laser Interferometry II
Y.Y. Hung; Ryszard J. Pryputniewicz, Editor(s)

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