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Optical Engineering

Measuring displacement fields by cross-correlation and a differential technique: experimental validation
Author(s): Jose Xavier; António M. R. Sousa; Jose J. L. Morais; Vitor M. J. Filipe; Mario A. Vaz
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Paper 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.©

Paper Details

Date Published: 6 April 2012
PDF: 13 pages
Opt. Eng. 51(4) 043602 doi: 10.1117/1.OE.51.4.043602
Published in: Optical Engineering Volume 51, Issue 4
Show Author Affiliations
Jose Xavier, Univ. de Trás-os-Montes e Alto Douro (Portugal)
António M. R. Sousa, Univ. de Trás-os-Montes e Alto Douro (Portugal)
Jose J. L. Morais, Univ. de Trás-os-Montes e Alto Douro (Portugal)
Vitor M. J. Filipe, Univ. de Trás-os-Montes e Alto Douro (Portugal)
Mario A. Vaz, Univ. do Porto (Portugal)

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