Title: Error estimation in measuring strain fields with DIC on planar sheet metal specimens with a non-perpendicular camera alignment
Authors: Lava, Pascal ×
Coppieters, Sam
Wang, Yueqi
Van Houtte, Paul
Debruyne, Dimitri #
Issue Date: Jan-2011
Publisher: Applied Science Publishers
Series Title: Optics and Lasers in Engineering vol:49 issue:1 pages:57-65
Abstract: The determination of strain fields based on displacement components obtained via 2D-DIC is subject to several errors that originate from various sources. In this contribution, we study the impact of a non-perpendicular camera alignment to a planar sheet metal specimen's surface. The errors are estimated in a numerical experiment. To this purpose, deformed images - that were obtained by imposing finite element (FE) displacement fields on an undeformed image - are numerically rotated for various Euler angles. It is shown that a 3D-DIC stereo configuration induces a substantial compensation for the introduced image-plane displacement gradients. However, higher strain accuracy and precision are obtained - up to the level of a perfect perpendicular alignment - in a proposed "rectified" 2D-DIC setup. This compensating technique gains benefit from both 2D-DIC (single camera view, basic amount of correlation runs, no cross-camera matching nor triangulation) and 3D-DIC (oblique angle compensation). Our conclusions are validated in a real experiment on SS304. (C) 2010 Elsevier Ltd. All rights reserved.
ISSN: 0143-8166
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Mechanical Metallurgy Section (-)
Department of Materials Engineering - miscellaneous
Materials Technology TC, Technology Campuses Ghent and Aalst
Technologiecluster Materialentechnologie
× corresponding author
# (joint) last author

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