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

• Tipo: Artigo em Revista Científica Internacional
• Data: 2012

Autores

Xavier, J (Autor) Outra; Sousa, AMR (Autor) Outra; Morais, JJL (Autor) Outra; Filipe, VMJ (Autor) Outra; Mário Vaz (Autor) FEUP

Revista

Título: Optical Engineering

Vol. 51

Página Final: 043602

ISSN: 0091-3286

Editora: SPIE

Indexação

ISI Web of Knowledge - 25 Citações

Scopus - 30 Citações

Outras Informações

ID Authenticus: 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]

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 12