Keywords: extended digital image correlation, distance transformation algorithm, multiscale damage, non-destructive test.

An extended digital image correlation (EDIC) technique was presented this paper for mapping multiscale damage in concretes. This new technique was developed in terms of a distance transformation algorithm for filling the gap between current non-destructive test (NDT) techniques in detecting damage in engineering materials and the requirements from industrial damage assessment and academic research activities. The developed EDIC technique first extended the capability of current digital image correlation (DIC) from macro damage detection to micro damage detection, which enables a non-destructive test of multiscale damage at the structural level. A number of concrete beam specimens investigated in the laboratory using the EDIC are reported in this paper. These examples proved the capability of the EDIC in detecting micro cracks in concrete by comparing camera images obtained at the different loading levels with the EDIC detection. This developed EDIC technique provided an essential tool for carrying out in-situ detection of damage in concrete structures, and for further research on material damages in academia.

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