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Assessment of digital image correlation measurement accuracy in the ultimate error regime: main results of a collaborative benchmark

Amiot, Fabien and Bornert, Michel and Doumalin, Pascal and Dupré, Jean-Christophe and Fazzini, Marina and Orteu, Jean-José and Poilane, Christophe and Robert, Laurent and Rotinat, René and Toussaint, Eveline and Wattrisse, Bertrand and Wienin, Jean-Samuel Assessment of digital image correlation measurement accuracy in the ultimate error regime: main results of a collaborative benchmark. (2013) Strain, 49 (6). 483-496. ISSN 1475-1305

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Official URL: http://onlinelibrary.wiley.com/doi/10.1111/str.12054/abstract

Abstract

We report on the main results of a collaborative work devoted to the study of the uncertainties associated with Digital image correlation techniques (DIC). More specifically, the dependence of displacement measurement uncertainties with both image characteristics and DIC parameters is emphasised. A previous work [Bornert et al. (2009) Assessment of digital image correlation measurement errors: methodology and results. Exp. Mech. 49, 353-370] dedicated to situations with spatially fluctuating displacement fields demonstrated the existence of an ultimate error' regime, insensitive to the mismatch between the shape function and the real displacement field. The present work is focused on this ultimate error. To ensure that there is no mismatch error, synthetic images of in-plane rigid body translation have been analysed. Several DIC softwares developed by or in use in the French community have been used to explore the effects of a large number of settings. The discrepancies between DIC evaluated displacements and prescribed ones have been statistically analysed in terms of random errors and systematic bias, in correlation with the fractional part of the displacement component expressed in pixels. Main results are as follows: (i) bias amplitude is almost always insensitive to subset size, (ii) standard deviation of random error increases with noise level and decreases with subset size and (iii) DIC formulations can be split up into two main families regarding bias sensitivity to noise. For the first one, bias amplitude increases with noise while it remains nearly constant for the second one. In addition, for the first family, a strong dependence of random error with is observed for noisy images.

Item Type:Article
Additional Information:Thanks to Blackwell Publishing editor. The definitive version is available at : http://onlinelibrary.wiley.com/doi/10.1111/str.12054/abstract
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > Arts et Métiers ParisTech (FRANCE)
French research institutions > Commissariat à l'Energie Atomique et aux énergies alternatives - CEA (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Ecole Nationale Supérieure d'Ingénieurs de Caen - ENSICAEN (FRANCE)
Other partners > Ecole Nationale Supérieure de Mécanique et d'Aérotechnique - ENSMA (FRANCE)
Other partners > Ecole Nationale Supérieure de Mécanique et des Microtechniques - ENSMM (FRANCE)
Université de Toulouse > Ecole nationale supérieure des Mines d'Albi-Carmaux - IMT Mines Albi (FRANCE)
French research institutions > Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux - IFSTTAR (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Institut National des Sciences Appliquées de Toulouse - INSA (FRANCE)
Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Université de Caen Basse-Normandie (FRANCE)
Other partners > Université Blaise Pascal - UBP (FRANCE)
Other partners > Université de Franche-Comté (FRANCE)
Other partners > Université de Montpellier 2 (FRANCE)
Other partners > Université de Poitiers (FRANCE)
Other partners > Université de Technologie de Belfort-Montbéliard - UTBM (FRANCE)
Other partners > IMT Mines Alès (FRANCE)
Other partners > Ecole des Ponts ParisTech (FRANCE)
Other partners > Institut français de mécanique avancée - IFMA (FRANCE)
Other partners > Institut de recherche sur les matériaux avancés - IRMA (FRANCE)
Other partners > Université du Maine (FRANCE)
Other partners > Université Paris-Est Marne-La-Vallée - UPEM (FRANCE)
Laboratory name:
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Deposited By: Marina Fazzini
Deposited On:20 Jan 2014 13:28

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