Abstract
In grid and moiré analyses, patterns developed in a deformed body are sometimes superposed to obtain the difference of their parameters, as when it is desired to obtain velocities by superimposing two isothetic patterns. In this operation, an inherent difficulty develops because, as a consequence of the deformation, not all points can be matched. An error follows which is analyzed here. Means to avoid or to compute the error are suggested.
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References
Coker, E. G. andFilon, L. N., A Treatise on Photoelasticity, Cambridge University Press, New York, 178 (1931).
Pirard, A., “Considérations sur la méthode du moiré en photoélasticité,”Rev. Univ. des Mines, 9e Serie, tome XVI (4),177–200 (1960).
Oster, G., Wasserman, M. andZwerling, C., “Theoretical Interpretation of Moiré Patterns,”Jnl. Optical Soc. Am.,54 (2),169–175 (1964).
Post, D., The Generic Nature of the Absolute Retardation Method of Photoelasticity,Experimental Mechanics,7 (6),233–241 (June 1967).
Durelli, A. J. andParks, V. J., “Moiré Fringes as Parametric Curves,”Experimental Mechanics,7 (3)97–104 (March 1967).
Durelli, A. J., “Visual Representation of the Kinematics of the Continuum,”Experimental Mechanics,6 (3),113–139 (March 1966).
Durelli, A. J. andParks, V. J., Moiré Analysis of Strain, Prentice-Hall, Englewood Cliffs, N. J. (1970).
Clark, J. A. andDurelli, A. J., “Separation of Additive and Subtractive Moiré Patterns,”Jnl. of Appl. Mech.,38 (1),266–269 (March 1971).
Post, D. (Private Communication).
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Parks, V.J., Durelli, A.J. An error associated with graphical parametric operations. Experimental Mechanics 11, 429–432 (1971). https://doi.org/10.1007/BF02327648
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DOI: https://doi.org/10.1007/BF02327648