Digital image correlation and finite element analysis of inter- and intra-granular deformation by Dave, S, Song, X, Hofmann, F, Dragnevski, K, Korsunsky, A

“…Thus, strain inhomogeneity at the grain level is strongly dependent on the local microstructure, and not simply of the grain's own orientation, as implied in self- consistent modelling schemes [1,3]. Digital image correlation (DIC) is an excellent tool for probing deformation behaviour at different resolutions, since it is independent of the precise physical length scale, and can be applied to any digital image, e.g. obtained from optical or scanning electron microscopy, or AFM. …”

The height Digital Image Correlation (hDIC) technique for the identification of triaxial surface deformations by Uzun, F, Korsunsky, A

“…This paper introduces the height digital image correlation (hDIC) technique for the identification of triaxial deformations. …”

Digital image correlation of 2D X-ray powder diffraction data for lattice strain evaluation by Zhang, H, Sui, T, Salvati, E, Daisenberger, D, Lunt, A, Fong, K, Song, X, Korsunsky, A

“…A new method is proposed here that relies on direct Digital Image Correlation analysis of 2D X-ray powder diffraction patterns (XRD-DIC, for short). …”

Residual stress evaluation at the micrometer scale: Analysis of thin coatings by FIB milling and digital image correlation by Korsunsky, A, Sebastiani, M, Bemporad, E

“…The newly proposed approach involves incremental Focused Ion Beam (FIB) milling of annular trenches at material surface, combined with high resolution SEM imaging of a previously deposited marker pattern. Digital image correlation (DIC) analysis of the relative displacements between markers with respect to the undisturbed state provides a measure of strain relief. …”

Combining Laue microdiffraction and digital image correlation for improved measurements of the elastic strain field with micrometer spatial resolution by Petit, J, Bornert, M, Hofmann, F, Robach, O, Micha, J, Ulrich, O, Le Bourlot, C, Faurie, D, Korsunsky, A, Castelnau, O

“…We show that using Digital Image Correlation for measuring Laue pattern distortions between two mechanical states improves significantly the estimate of elastic strain increment. …”

Polar transformation of 2D X-ray diffraction patterns and the experimental validation of the hDIC technique by Uzun, F, Salimon, A, Statnik, E, Besnard, C, Chen, J, Moxham, T, Salvati, E, Wang, Z, Korsunsky, A

“…Whilst optical methods deliver information about surface displacements, X-ray scattering methods have the capability to provide efficient assessment of crystal lattice distortion in the bulk of the component. The height digital image correlation (hDIC) technique is an alternative to conventional digital image correlation that uses the out-of-plane surface height variations for the identification of triaxial deformations. …”

Understanding nature's residual strain engineering at the human dentine-enamel junction interface by Sui, T, Lunt, A, Baimpas, N, Sandholzer, M, Li, T, Zeng, K, Landini, G, Korsunsky, A

“…Key developments reported are systematic focused ion beam (FIB) milling and digital image correlation (DIC) micrometre scale residual strain evaluation, and the determination of principal strain direction near DEJ, correlated with internal architecture responsible for remarkable strength. …”

Focused ion beam ring drilling for residual stress evaluation by Korsunsky, A, Sebastiani, M, Bemporad, E

“…Strain change was measured at sample surface via Digital Image Correlation analysis of SEM micrographs of a regular pattern of dots deposited on the sample surface prior to ring drilling. …”

On the cyclic deformation and residual stress in Ni-base single crystal superalloys by Ying, S, Sui, T, Lunt, A, Reed, R, Korsunsky, A

“…We also report the application of a recently developed flexible methodology for measuring (sub)micron scale residual stress utilizing Focused Ion Beam and Digital Image Correlation (FIB-DIC) techniques in the ring-core drilling geometry.…”

Focused ion beam ring drilling for residual stress evaluation by Korsunsky, A, Sebastiani, M, Bemporad, E

“…Strain change was measured at sample surface via Digital Image Correlation analysis of SEM micrographs of a regular pattern of dots deposited on the sample surface prior to ring drilling. …”

Residual stress measurement in thin films at sub-micron scale using Focused Ion Beam milling and imaging by Song, X, Yeap, K, Zhu, J, Belnoue, J, Sebastiani, M, Bemporad, E, Zeng, K, Korsunsky, A

“…Focused Ion Beam was employed to introduce the strain relief by milling the slots around an "island" and also to record the images for strain change evaluation by digital image correlation analysis of micrographs. Finite element simulation was employed to predict the curves for strain relief as a function of milling depth, and compared with the experimental measurements, showing good agreement. …”

A New Methodology For In-Situ Residual Stress Measurement In MEMS Structures by Sebastiani, M, Bemporad, E, Melone, G, Rizzi, L, Korsunsky, A

“…The newly proposed approach involves incremental focused ion beam (FIB) milling of annular trenches at material surface, combined with high resolution SEM imaging and Digital Image Correlation (DIC) analysis for the measurement of the strain relief over the surface of the remaining central pillar. …”

Uncertainty quantification of residual stress evaluation by the FIB–DIC ring-core method due to elastic anisotropy effects by Salvati, E, Sui, T, Korsunsky, A

“…For the focused ion beam - digital image correlation (FIB-DIC) ring-core method taken as an example, a Mathematica package was developed to evaluate the complete in-plane residual stress state from the measured strain relief values using known material orientation and anisotropic elastic properties for materials displaying cubic symmetry. …”

Crack tip deformation fields and fatigue crack growth rates in Ti-6Al-4V by Korsunsky, A, Song, X, Belnoue, J, Jun, T, Hofmann, F, De Matos, P, Nowell, D, Dini, D, Aparicio-Blanco, O, Walsh, M

“…Crack opening was measured during cycling using digital image correlation, and residual stress intensity factor was determined using synchrotron X-ray diffraction mapping. …”

Focused ion beam four-slot milling for Poisson's ratio and residual stress evaluation at the micron scale by Sebastiani, M, Eberl, C, Bemporad, E, Korsunsky, A, Nix, W, Carassiti, F

“…A novel method is presented for the assessment of the Poisson's ratio and residual stress on the micron scale, based on focused ion beam (FIB) two-step four-slot micro-milling and in-situ digital image correlation (DIC) analysis of the induced relaxation strains at the specimen's surface. …”

Nanoscale depth profiling of residual stresses due to fine surface finishing by Everaerts, J, Salvati, E, Korsunsky, A

“…In this study, the magnitude and depth of polishing‐induced residual stress are evaluated directly by focused ion beam milling and digital image correlation using the micro‐ring‐core geometry method. …”

Focused ion beam four-slot milling for Poisson's ratio and residual stress evaluation at the micron scale by Sebastiani, M, Eberl, C, Bemporad, E, Korsunsky, A, Nix, W, Carassiti, F

“…A novel method is presented for the assessment of the Poisson's ratio and residual stress on the micron scale, based on focused ion beam (FIB) two-step four-slot micro-milling and in-situ digital image correlation (DIC) analysis of the induced relaxation strains at the specimen's surface.The methodology has been fully validated through modelling and experiments on three different materials, namely, physical vapour deposition (PVD) chromium nitride (CrN), and as-deposited and annealed Cu thin films. …”

Crack tip deformation fields and fatigue crack growth rates in Ti-6Al-4V by Korsunsky, A, Song, X, Belnoue, J, Jun, T, Hofmann, F, De Matos, P, Nowell, D, Dini, D, Aparicio-Blanco, O, Walsh, M

“…Crack opening was measured during cycling using digital image correlation, and residual stress intensity factor was determined using synchrotron X-ray diffraction mapping. …”

Intragranular residual stress evaluation using the semi-destructive FIB-DIC ring-core drilling method by Lunt, A, Korsunsky, A

“…The semi-destructive ring-core drilling method using Focused Ion Beam (FIB) and Digital Image Correlation (DIC) was used for in-plane residual stress estimation in ten grains at the sample surface. …”

Residual stress measurement in thin films using the semi-destructive ring-core drilling method using Focused Ion Beam by Song, X, Yeap, K, Zhu, J, Belnoue, J, Sebastiani, M, Bemporad, E, Zeng, K, Korsunsky, A

“…Either SEM or FIB imaging can be used to record sequences of images for strain change evaluation by Digital Image Correlation (DIC) analysis of micrographs. …”