Research Article
Apr 1963
Interpretation of Moire Patterns
Authors: A.J. Durelli, C.A. Sciammarella, and V.J. ParksAuthor Affiliations
Publication: Journal of the Engineering Mechanics Division
Volume 89, Issue 2
Abstract
A description of several of the basic properties of moiré patterns used in strain analysis is presented. The uniqueness and continuity of displacements are noted, compared with topological elevations, and the ordering of fringes is demonstrated to follow. The meaning of lines of zero slope in the pattern is shown to be an aid in strain analysis. Singular points of the elliptical, hyperblic, and double-tangent type are described. Singular lines are noted as an extension of singular points. The effect on the moiré pattern of rotation of the master and model grid systems is presented in terms of Mohr's circle. The use of symmetry in order to obtain additional information from the pattern is demonstrated, including an example of a complete analysis from one pattern, wherein the proper regard is given to symmetry. The description is illustrated with patterns from a ring and a disk under diametral load, a strip with a hole subjected to uniaxial tension, a plate with two concentrated loads on one edge, and a disk subjected to four-point loading.
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Information
Published In
Journal of the Engineering Mechanics Division
Volume 89 • Issue 2 • April 1963
Pages: 71 - 88
Copyright
© 1963 American Society of Civil Engineers.
History
Published in print: Apr 1963
Published online: Feb 3, 2021
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Authors
Affiliations
A.J. Durelli
Prof., Civ. Engrg. Dept., The Catholic Univ. of America, Washington, D. C.
C.A. Sciammarella
Assoc. Prof., Advanced Mechanics, Univ. of Florida, Gainesville, Fla.
V.J. Parks
Assoc. Research Engr., Civ. Engrg. Dept., The Catholic Univ. of America, Washington, D. c.
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