6 April 2012 Measuring displacement fields by cross-correlation and a differential technique: experimental validation
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A digital image correlation (DIC) algorithm for displacement measurements combining cross-correlation and a differential technique was validated through a set of experimental tests. These tests consisted of in-plane rigid-body translation and rotation tests, a tensile mechanical test, and a mode I fracture test. The fracture mechanical test, in particular, was intended to assess the accuracy of the method when dealing with discontinuous displacement fields, for which subset-based image correlation methods usually give unreliable results. The proposed algorithm was systematically compared with the Aramis® DIC-2D commercial code by processing the same set of images. When processing images from rigid-body and tensile tests (associated with continuous displacement fields), the two methods provided equivalent results. When processing images from the fracture mechanical test, however, the proposed method obtained a better qualitative description of the discontinuous displacements. Moreover, the proposed method gave a more reliable estimation of both crack length and crack opening displacement of the fractured specimen.©
© 2012 Society of Photo-Optical Instrumentation Engineers (SPIE)
Jose Xavier, António M. R. Sousa, Jose J. L. Morais, Vitor M. J. Filipe, Mario A. Vaz, "Measuring displacement fields by cross-correlation and a differential technique: experimental validation," Optical Engineering 51(4), 043602 (6 April 2012). https://doi.org/10.1117/1.OE.51.4.043602 . Submission:

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