Processing discontinuous displacement fields by a spatio-temporal derivative technique

• Type: Article in International Scientific Journal
• Date: 2011

Authors

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

Journal

Title: Optics and Lasers in Engineering

Vol. 49

Pages: 1402-1412

ISSN: 0143-8166

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 38 Citations

Scopus - 40 Citations

Other information

Authenticus ID: P-002-JFV

DOI: 10.1016/j.optlaseng.2011.07.007

Abstract (EN): In this paper, a digital image correlation (DIC) method coupling cross-correlation with spatio-temporal differential techniques was proposed for assessing discontinuous displacement fields. The accuracy and robustness of the algorithm was assessed on a set of numerical tests by processing computer generated speckled-pattern images. Fracture mechanical tests in mode I were considered, in which both in-plane and out-of-plane rigid-body movements were taken into account. The ability for recovering the analytical asymptotic displacement field in mode I was analysed, and stress intensity factor, crack opening displacement and crack tip location were used as quantitative parameters for validation purposes. Throughout these tests, the results obtained with the proposed method were systematically compared to the ones from Aramis DIC-2D commercial code. Globally, the results computed from both methods are in good agreement with reference values. However, due to the high spatial resolution (point-wise characteristic), a better matching of the displacements in the neighbour of discontinuities could be obtained by the proposed method.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 11