Title: Study of systematic errors in strain fields obtained via DIC using heterogeneous deformation generated by plastic FEA
Authors: Lava, Pascal ×
Cooreman, Steven
Debruyne, Dimitri #
Issue Date: Apr-2010
Publisher: Applied Science Publishers
Series Title: Optics and Lasers in Engineering vol:48 issue:4 pages:457-468
Abstract: In this article, systematic errors that arise in the derivation of strain fields based on displacement fields obtained by digital image correlation (DIC) are analyzed. Attention is paid to errors that arise from different implementations of the DIC technique. In particular, we investigate the influence of the shape function, the interpolation order and the subset size on the derived strains. In addition, we focus on errors that can be directly attributed to the derivation of the strain fields, e.g. the strain-window size and the strain-window interpolation order. The errors are estimated using numerically deformed images that were obtained by imposing finite element (FE) displacement fields on an undeformed image yielding plastic deformation of the specimen. This FE procedure simulates realistic experimental heterogeneous deformations at various load steps. It is shown that the errors on the strain fields can be substantially reduced if conscious choices in the abovementioned implementations are made.
ISSN: 0143-8166
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Department of Materials Engineering - miscellaneous
Materials Technology TC, Technology Campuses Ghent and Aalst
Technologiecluster Materialentechnologie
× corresponding author
# (joint) last author

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