Measuring displacement fields by cross-correlation and a differential technique: experimental validation

• Type: Article in International Scientific Journal
• Date: 2012

Authors

Xavier, J (Author) Other; Sousa, AMR (Author) Other; Morais, JJL (Author) Other; Filipe, VMJ (Author) Other; Mário Vaz (Author) FEUP

Journal

Title: Optical Engineering

Vol. 51

Final page: 043602

ISSN: 0091-3286

Publisher: SPIE

Indexing

ISI Web of Knowledge - 25 Citations

Scopus - 30 Citations

Other information

Authenticus ID: P-002-BA1

DOI: 10.1117/1.oe.51.4.043602

Abstract (EN): 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 (R) 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.(C) (C) 2012 Society of Photo-Optical Instrumentation Engineers (SPIE). [DOI: 10.1117/1.OE.51.4.043602]

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 12