6 April 2012 Measuring displacement fields by cross-correlation and a differential technique: experimental validation
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Abstract
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, Jose Xavier, António M. R. Sousa, António M. R. Sousa, Jose J. L. Morais, Jose J. L. Morais, Vitor M. J. Filipe, Vitor M. J. Filipe, Mario A. Vaz, 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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