DIC Challenge 2.0: Developing Images and Guidelines for Evaluating Accuracy and Resolution of 2D Analyses

• DOI: 10.1007/s11340-021-00806-6
• Publication Date: 2022-01-04T19:04:00Z
• Authors: P. L. Reu; B. Blaysat; E. Andó; K. Bhattacharya; C. Couture; V. Couty; D. Deb; S. S. Fayad; M. A. Iadicola; S. Jaminion; M. Klein; A. K. Landauer; P. Lava; M. Liu; L. K. Luan; S. N. Olufsen; J Réthoré; E. Roubin; D. T. Seidl; T. Siebert; O. Stamati; E. Toussaint; D. Turner; C. S. R. Vemulapati; T. Weikert; J. F. Witz; O. Witzel; J. Yang
• Keywords: Digital image correlation

International audience; Background: The DIC Challenge 2.0 follows on from the work accomplished in the first DigitalImage Correlation (DIC) Challenge [1]. The second challenge was required to better quantify the spatialresolution of 2D-DIC codes. Objective : The goal of this paper is to outline the methods and images forthe 2D-DIC community to use to evaluate the performance of their codes and improve the implementationof 2D-DIC. Methods : This paper covers the creation of the new challenge images and the analysis anddiscussion of the results. It proposes a method of unambiguously defining spatial resolution for 2D-DIC andexplores the tradeoff between displacement and strain noise (measurement resolution) and spatial resolutionfor a wide variety of DIC codes by a combination of the images presented here and a performance factorcalled Metrological Efficiency Indicator (MEI). Results : The performance of the 2D codes generally followedthe expected theoretical performance, particularly in the measurement of the displacement. The comparisondid however show that even with fairly uniform displacement performance, the calculation of the strainspatial resolution varied widely. Conclusions : This work provides a useful framework for understandingthe tradeoff and analyzing the performance of the DIC software using the provided images. It details someof the unique errors associated with the analysis of these images, such as the Pattern Induced Bias (PIB)and imprecision introduced through the strain calculation method. Future authors claiming improvementsin 2D accuracy are encouraged to use these images for an unambiguous comparison