Estimation of microscale strain fields in a pearlitic steel using DIC and in-situ SEM
Year: 2014
Type: article
Abstract: In this contribution the Digital Image Correlation (DIC) technique is used to identify strain fields within a pearlitic microstructure from in-situ obtained SEM images. Typically this is done using a synthetic speckle but in this study the intensity field variations, related to the\nmicrostructure of pearlite, are used as a natural speckle.\n\nAs a means to avoid subsets with inadequate information content (in terms of intensity field variations) a tracebility criterion is introduced. This criterion is based on the eigenvalues of the Hessian of the autocorrelation function. A pertaining algorithm, which can be used to identify high quality subsets (in terms of tracebility) within a certain Region Of Interest (ROI),\nis also presented. By using the obtained irregular subsets grids together with synthetically deformed images the\ndisplacement and deformation gradient errors (both local and average) are studied as a function of the applied loading for various subset sizes.
Authors: Erik Lindfeldt, Johan Ahlström, Magnus Hörnqvist Colliander, Ru Peng
Language: English
Subfield: Computer Vision and Pattern Recognition
Field: Computer Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W156966472