Keywords and Phrases
Digital image correlation; Experimental mechanics; Image registration; Material testing
"Digital image correlation (DIC) is a non-contact full-field optical measurement method. With the advantages of high accuracy, low cost, and simple implementation, it has been widely applied in the area of experimental mechanics. In this study, DIC algorithm has been improved in the aspects of the pixel-level searching method and reference frame update strategy. The feature matching based method is proposed to provide an initial guess for all points of interest with semi-subpixel level accuracy in cases with small or large translation, deformation, or rotation. The bisection searching strategy is presented to automatically adjust the frame step for varying practical circumstances.
The improved DIC algorithm is implemented and applied to the miniature tensile test. A convenient experimental method to determine the true stress-strain curve is proposed. The instantaneous cross-section area is estimated by only one camera in aid of DIC method. The derived true stress-strain curves and mechanical parameters of metal material Al6061 and CP-Ti from miniature specimens match well with the results of standard specimens, and no dimension dependence has been observed in the results"--Abstract, page iv.
Liou, Frank W.
Newkirk, Joseph William
Mechanical and Aerospace Engineering
Ph. D. in Mechanical Engineering
Missouri University of Science and Technology
Journal article titles appearing in thesis/dissertation
- Improved initial guess with semi-subpixel level accuracy in digital image correlation by feature based method
- Bisection searching based reference frame update strategy for digital image correlation
- Determination of constitutive relation from miniature tensile test with digital image correlation
xi, 93 pages
© 2019 Yunlu Zhang, All rights reserved.
Dissertation - Open Access
Electronic OCLC #
Zhang, Yunlu, "Improvements in digital image correlation and application in material mechanical test" (2019). Doctoral Dissertations. 2854.