Abstract
A low-cost, easy-to-implement yet effective panoramic-digital image correlation (panoramic-DIC) system comprising a single binocular stereo-DIC system and two planar mirrors is proposed for full-surface 360-deg shape reconstruction and deformation measurement in material testing. With the aid of two mirrors, the rear portions of the object's full surface can be captured and reconstructed by the same stereo-DIC system that directly captures the front surface of the specimen. Two speckle patterns premade on the mirrors are used to transform all surface portions into a common global coordinate thus allowing a straightforward full-surface 360-deg profile and deformation measurements. For method validation, real experiments including full-surface 360-deg shape and displacement measurements of a cylinder and true stress-strain curves determination of a round low carbon steel specimen were performed. Results demonstrate that the proposed panoramic-DIC technique can provide accurate full-surface 360-deg shape and deformation data in standard material testing with important advantages such as low cost, compactness and easy implementation.
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