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Measurement of Elastic and Rotation Fields during Irreversible Deformation using Heaviside-Digital Image Correlation

J.-C. Stinville 1 M.A. Charpagne 1 F. Bourdin 2 P.G. Callahan 3 Z. Chen 1 M.P. Echlin 1 Damien Texier 4 J. Cormier 2 P. Villechaise 2 T.M. Pollock 1 Valery Valle 2
1 UCSB - University of California [Santa Barbara]
2 PPRIME - Institut Pprime
3 U.S. Naval Research Laboratory
4 ICA - Institut Clément Ader
Abstract : The recent development of the high resolution and discontinuity-tolerant digital image correlation technique enables the extraction of discontinuities within a displacement field. The technique provides quantitative analysis of discontinuities arising from slip, shear bands, cracks, and grain boundary sliding in a variety of material systems, including polycrystalline metallic materials. The discontinuity-tolerant digital image correlation method can be implemented to retrieve not only quantitative discontinuity analysis but also the local strain and rotation fields that operate near these discontinuities. The present implementation includes high-resolution digital image correlation (HR-DIC) measurements collected in a scanning electron microscope for analysis of both the plastic and elastic fields that develop during deformation of polycrystalline metallic materials. The combination of the discontinuity-tolerant DIC technique with the computation of internal gradients enables extraction of non-localized strain and rotation fields during plastic deformation of a nickel-based superalloy. Therefore the lattice rotation/expansion and plastic localization that occur during deformation can be determined in a single experiment. This method is validated using synthetic images with preset deformation, and experimental measurements using the electron back scatter diffraction (EBSD) technique.
Keywords : High Resolution Digital Image Correlation Heaviside-DIC Polycrystalline Nickel-based Superalloys Scanning Electron Microscopy Digital Image Correlation Strain Localization Discontinuities Measurements Elastic and Plastic Strain Micro-volumes Elastic Heterogeneity rotation field
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Submitted on : Tuesday, September 29, 2020 - 10:43:16 PM
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INSTITUT-TELECOM | PPRIME | INSA-GROUPE | ICA | ICA-ALBI | INSA-TOULOUSE | UNIV-POITIERS | CNRS | MINES-ALBI | UNIV-TLSE3

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J.-C. Stinville, M.A. Charpagne, F. Bourdin, P.G. Callahan, Z. Chen, et al.. Measurement of Elastic and Rotation Fields during Irreversible Deformation using Heaviside-Digital Image Correlation. Materials Characterization, Elsevier, 2020, 169, pp.1-16/110600. ⟨10.1016/j.matchar.2020.110600⟩. ⟨hal-02935109⟩

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