Two-dimensional digital image correlation for in-plane displacement and strain measurement: a review

Abstract

As a practical and effective tool for quantitative in-plane deformation measurement of a planar object surface, two-dimensional digital image correlation (2D DIC) is now widely accepted and commonly used in the field of experimental mechanics. It directly provides full-field displacements to sub-pixel accuracy and full-field strains by comparing the digital images of a test object surface acquired before and after deformation. In this review, methodologies of the 2D DIC technique for displacement field measurement and strain field estimation are systematically reviewed and discussed. Detailed analyses of the measurement accuracy considering the influences of both experimental conditions and algorithm details are provided. Measures for achieving high accuracy deformation measurement using the 2D DIC technique are also recommended. Since microscale and nanoscale deformation measurement can easily be realized by combining the 2D DIC technique with high-spatial-resolution microscopes, the 2D DIC technique should find more applications in broad areas.

Evaluation of Crack Propagation and Post-cracking Hinge-type Behavior in the Flexural Response of Steel Fiber Reinforced Concrete

“…A two-dimensional displacement field was obtained for all points on the surface from cross-correlating the image of the deformed specimen with the image of the specimen in the reference configuration. Correlations and pattern identification is performed within small neighborhoods called subsets (Sutton et al 1983(Sutton et al , 1988Pan et al 2009). In a given image, the pixel gray-levels in each subset associated with the random sprayed-on pattern gives a unique gray-level pattern, which differs from gray-level distribution in another subset.…”

Fracture characterization of human cortical bone under mode II loading using the end-notched flexure test

“…DIC is an imaged-based technique which provides the measurement of displacements on subregions defined across images of a target object under deformation [11,20,22]. The object surface of interest must be locally characterized by a textured pattern with suitable contrast, isotropy and average size.…”

Extracting accurate strain measurements in bone mechanics: A critical review of current methods

“…This is mostly due to the lack of methodological studies conducted with DIC on bone samples. Such studies are limited to 2D-DIC studies evaluated using synthetic images [18], [58], [59], thus not considering the spectrum of additional complexities introduced by testing human bone samples (e.g., non-planar, rough and wet surfaces, tracked using a 3D-surface DIC approach). Only Gilchrist et al [45] performed a validation of DIC on bone against one SG.…”