On the Resolution of Local and Global DIC Approaches
Local and global approaches to digital image correlation are compared when the displacement interpolation is based upon bilinear shape functions (i.e., with four-noded quadrilaterals). The resolution in terms of displacements and strains provided by both techniques is evaluated by using a series of images from a real experiment. It is shown that global approaches out-perform a local approach. For the global approach, mesh adaption is proposed to get a quasi-uniform uncertainty distribution over the whole region of interest.
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