The moire´ method is combined with hologram interferometry to obtain the three displacements of an arbitrarily deformed plane in the three-dimensional space. Double beam interference patterns are utilized. The interfering beams are obtained from the diffraction patterns of a grating printed in the analyzed plane. The in-plane and the out-of-plane displacements are measured in separate steps and yield separate patterns. The patterns are generated by double exposure and observed by a wave front reconstruction process. The experimental results included in the paper show a good agreement with theoretical results, proving the feasibility of the proposed technique.
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Moire´-Holographic Technique for Three-Dimensional Stress Analysis
C. A. Sciammarella,
G. Di Chirico,
C. A. Sciammarella
Department of Applied Mechanics, Polytechnic Institute of Brooklyn, Brooklyn, N. Y.
G. Di Chirico
Centro Sperimentale Metallurgico, Rome, Italy
Department of Aerospace Engineering and Applied Mechanics, Polytechnic Institute of Brooklyn, Brooklyn, N. Y.
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Sciammarella, C. A., Di Chirico, G., and Chang, T. (March 1, 1970). "Moire´-Holographic Technique for Three-Dimensional Stress Analysis." ASME. J. Appl. Mech. March 1970; 37(1): 180–185. https://doi.org/10.1115/1.3408429
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