@inproceedings{9108c03394e44289a67a54d5de018e64,
title = "Comparison of subset-based local and finite element-based global digital image correlation",
abstract = "Subset-based local DIC and finite element-based (FE-based) global DIC are the two primary image matching methods that have been extensively investigated and regularly used in experimental mechanics community. Due to its straightforward implementation and high efficiency, subset-based local DIC has been used in almost all commercial DIC packages. However, it is assumed by some researchers that element-based global DIC offers better accuracy because of the enforced continuity between element nodes. Thus there is a pressing need to comprehensively examine the performance of these two DIC approaches. In this work, theoretical analyses of the standard deviation errors of classic subset-based DIC and two FE-based DIC techniques are first performed. Then, by measuring displacements of the same calculation points using the same calculation algorithms and identical calculation parameters, the performances of subset-based local DIC and two FE-based global DIC approaches are compared experimentally in terms of measurement error and computation efficiency using numerical tests and real experiments. A detailed examination of both the theoretical and experimental results reveals that, when subset (element) size is not very small, standard subset-based local DIC approach not only provides better results in measured displacements, but also demonstrates much higher computation efficiency. However, several special merits of FE-based global DIC approaches are indicated.",
keywords = "Digital image correlation, Displacement measurement, Finite element, Subpixel, Subset",
author = "Bing Pan and Bo Wang and Gilles Lubineau and Ali Moussawi",
year = "2016",
month = jan,
day = "1",
doi = "10.1007/978-3-319-22446-6_21",
language = "English (US)",
isbn = "9783319224459",
series = "Conference Proceedings of the Society for Experimental Mechanics Series",
publisher = "Springer New York LLC",
pages = "163--173",
editor = "Luciano Lamberti and Ming-Tzer Lin and Helena Jin and Sanichiro Yoshida",
booktitle = "Advancement of Optical Methods in Experimental Mechanics - Proceedings of the 2015 Annual Conference on Experimental and Applied Mechanics",
note = "Annual Conference on Experimental and Applied Mechanics, 2015 ; Conference date: 08-06-2015 Through 11-06-2015",
}