Compression strain measurement by digital speckle correlation |
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Authors: | D. Zhang X. Zhang G. Cheng |
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Affiliation: | (1) Department of Astronautical Technology, National University of Defense Technology, 410073 Changsha, People's Republic of China |
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Abstract: | In this paper, an optimized digital speckle correlation algorithm, named big-window correlation, is proposed to iterate strain directly. Verified by some experiments, the sensitivity and accuracy of the displacement gradient measurement with this method can be improved greatly. Finally, this method was applied to the measurement of the compression strain for polyurethane foam plastics materials. Then the material properties, such as the module of elasticity and the Poisson ratio, with different mass densities were obtained. |
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Keywords: | Digital speckle correlation PFP deformation measurement |
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