Abstract
Planar digital image correlation has been extended to measure surface deformations of cylindrical specimens without physical contact for high-temperature situations. A single CCD camera acquires the surface image patterns of a section of a specimen in the undeformed and deformed states to determine two-dimensional displacements on a projection plane. Axial, circumferential and shear deformations are determined through curvature transformation on the two-dimensional projection displacement field. The resolution of this technique was determined for a cylinder of 22.23-mm diameter to be 3.5 μm for the axial displacement, 0.05 percent for the axial and shear strains and 0.08 percent for the circumferential strain when correlation computations are carried out over a field of 5 mm×5 mm.
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References
Sharpe, W.N., “Applications of the Interferometric Strain/Displacement Gage,”Opt. Eng.,21(3),483–488 (1982).
Peters, W.H. andRansom, W.F., “Digital Imaging Techniques in Experimental Stress Analysis,”Opt. Eng.,21(3),427–432 (1982).
Sutton, M.A., Wolters, W.J., Peters, W.H., Ranson, W.F., andMcNeil, S.R., “Determination of Displacements Using an Improved Digital Correlation Method,”Image Vision Comput.,1(3),133–139 (1983).
Sutton, M.A., Cheng, M., Peters, W.H., Chao, Y.J., andMcNeil, S.R., “Application of an Optimized Digital Image Correlation Method to Planar Deformation Analysis,”Image Vision Comput. 4(3),143–150 (1986).
Sutton, M.A., McNeil, S.R., Jang, J.S., andBabai, M., “The Effect of Subpixel Image Restoration on Digital Image Correlation Estimates,”Opt. Eng.,27(10),870–877 (1988).
Chu, T.C., Ranson, W.F., Sutton, M.A., andPeters, W.H., “Applications of Digital-image-correlation Techniques to Experimental Mechanics,” EXPERIMENTAL MECHANICS,25(3),232–244 (1985).
Bruck, H.A., McNeil, S.R., Sutton, M.A., andPeters, W.H., “Digital Image Correlation Using Newton-Raphson Method of Partial Differential Correction,” EXPERIMENTAL MECHANICS,29(3),261–267 (1989).
Luo, P.F., Chao, Y.J., Sutton, M.A., andPeters, W.H., “Accurate Measurement of 3-dimensional Deformations in Deformable and Rigid Bodies Using Computer Vision,” EXPERIMENTAL MECHANICS,33(2),123–132 (1993).
Chao, Y.J. and Sutton, M.A., “Accurate Measurement of Two- and Three-dimensional Surface Deformations for Fracture Specimens by Computer Vision,” in Experimental Techniques in Fracture, J.S. Epstein, ed., VCH Publishers, 59–93 (1993).
James, M.R., Morris, W.L., andCox, B.N., “A High Accuracy Automated Strain-field Mapper,” EXPERIMENTAL MECHANICS,30(1),60–67 (1990).
Vendroux, G. and Knauss, W.G., “Deformation Measurements at the Sub-micron Size Scale: I. Design of a Digital Scanning Tunneling Microscope,” GALCIT Report SM 94-4, California Institute of Technology, Pasadena.
Vendroux, G. and Knauss, W.G., “Deformation Measurements at the Sub-micron Size Scale: II. Refinements in the Algorithms for Digital Image Correlation,” GALCIT Report 94-5, California Institute of Technology, Pasadena.
Peters, W.H., Sutton, M.A., Ranson, W.F., Poplin, W.P., andWalker, D.M., “Whole-field Experimental Displacement Analysis of Composite Cylinders,” EXPERIMENTAL MECHANICS,29(1),58–62 (1989).
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Lu, H., Vendroux, G. & Knauss, W.G. Surface deformation measurements of a cylindrical specimen by digital image correlation. Experimental Mechanics 37, 433–439 (1997). https://doi.org/10.1007/BF02317310
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DOI: https://doi.org/10.1007/BF02317310