1 June 1986 Speckle Metrology Combined With Finite-Element Modeling For Stress Analysis
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Abstract
The work described in this report represents a successful demonstration of a hybrid approach to the analysis of structural deformation. Mathematical modeling was incorporated into the process of reducing data from a digital correlation analysis of experimentally obtained speckle data. These experimental data were collected by both directly imaging the speckled surface of the test subject onto a vidicon camera/digitizer system and transmitting this image to the camera via a flexible coherent fiber optic image bundle. Considerable savings of time and resources can be realized through applications of this hybrid approach in which the strengths of the theoretical and experimental procedures complement each other beautifully. The final hybrid results compare very favorably with values obtained by both a theoretical mathematical (finite-element) analysis and an independent experimental (high frequency moire) study, demonstrating the accuracy and reliability of this hybrid procedure. Finally, the successful use of flexible optical fiber elements for data access demonstrates the potential for application of speckle hybrid techniques to the study of remote or otherwise inaccessible regions of a prototype structure.
D. R. Matthys, T. D. Dudderar, J. A. Gilbert, M. A. Taher, H. S. Johnson, "Speckle Metrology Combined With Finite-Element Modeling For Stress Analysis," Optical Engineering 25(6), 256749 (1 June 1986). https://doi.org/10.1117/12.7973901 . Submission:
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