Application of High Magnification Digital Image Correlation Technique to Micromechanical Strain Analysis |
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Authors: | G. Nicoletto T. Marin G. Anzelotti R. Roncella |
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Affiliation: | 1. Department of Industrial Engineering, University of Parma, Viale G.P. Usberti, 181/A, 43100 Parma, Italy;2. Department of Civil and Environmental Engineering, University of Parma, Viale G.P. Usberti, 181/A, 43100 Parma, Italy |
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Abstract: | Abstract: 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. |
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Keywords: | digital image correlation full‐field strain map microstructure nodular cast iron |
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