The moiré method for measuring large-plane nonhomogeneous deformations
Tóm tắt
Moiré-fringe equations have been developed for directly determining the components of Green's and Cauchy's deformation tensors from measurements of fringe pitch and angle. The equations, which were previously verified for large-plane homogeneous deformations, are used to determine the deformation-tensor components for nonhomogeneous strain fields. The results are compared to theoretical values. Specifically, the deformations investigated are pure bending of a rectangular block, and extension of a tapered plane specimen.
Tài liệu tham khảo
Martin, L. P. andJu, F. D., “The Moiré Method for Measuring Large-plane Deformations,”ASME Paper No. 69-APMW-21, Trans. ASME, Jnl Appl. Mech.,36 (3),385–391 (Sept. 1969).
Theocaris, P. S., Moiré Fringes in Strain Analysis Pergamon Press, Oxford (1969).
Sciammarella, C. A. andDurelli, A. J., “Moiré Fringes as a Means of Analyzing Strains,”Trans., Am. Soc. Civ. Eng.,127,Part 1, 582–608 (1962).Pages 582–603.
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Martin, L. P., “Measurement of Deformations in a Large Displacement Gradient Field,” dissertation, Univ. N. M. (June 1968).
Morse, S., Durelli, A. J. andSciammarella, C. A., “Geometry of Moiré Fringes in Strain Analysis,”Proc. Am. Soc. Civ. Eng., LXXXVI (EM4),105–126 (August 1960).