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Application of High Magnification Digital Image Correlation Technique to Micromechanical Strain Analysis
Author(s) -
Nicoletto G.,
Marin T.,
Anzelotti G.,
Roncella R.
Publication year - 2011
Publication title -
strain
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.477
H-Index - 47
eISSN - 1475-1305
pISSN - 0039-2103
DOI - 10.1111/j.1475-1305.2008.00489.x
Subject(s) - digital image correlation , extensometer , materials science , microstructure , magnification , ultimate tensile strength , optical microscope , tensile testing , plasticity , composite material , strain (injury) , digital image , image processing , optics , image (mathematics) , computer science , scanning electron microscope , artificial intelligence , medicine , physics
This paper describes an experimental apparatus and its application for the full‐field measurement of heterogeneous strains at high magnifications. The apparatus consists of an image acquisition and analysis system, an optical microscope and a stable tensile stage. Magnified images of the specimen surface are acquired and analysed using the digital image correlation (DIC) method. The response of the heterogeneous microstructure of a nodular cast iron is investigated during a tensile test. Strains obtained by using the DIC method and averaged over the observation window correlate with strain measurements simultaneously obtained by using an extensometer. The strain maps of DIC reveal the heterogeneous development of plasticity in the nodular cast iron microstructure. The apparatus has the potential to investigate material behaviour at the microscopic scale.