This article proposes a digital image correlation (DIC) strain measurement method based on a finite
element (FE) algorithm. A two-step digital image correlation is presented. In the first step, the gradientbased
subpixels technique is used to search the displacements of a region of interest of the specimen,
and then the strain fields are obtained by utilizing the finite element method in the second step. Both
simulation and experiment processing, including tensile strain deformation, show that the proposed method
can achieve nearly the same accuracy as the cubic spline interpolation method in most cases and higher
accuracy in some cases, such as the simulations of uniaxial tension with and without noise. The results
show that it also has a good noise-robustness. Finally, this method is used in the uniaxial tensile testing
for Dahurian Larch wood specimens with or without a hole, and the obtained strain values are close to
the results which were obtained from the strain gauge and the cubic spline interpolation method.
© 2013 Optical Society of Korea
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