Journal ArticleDOI
Two-dimensional digital image correlation for in-plane displacement and strain measurement: a review
TLDR
In this article, a review of the 2D digital image correlation (2D DIC) technique for displacement field measurement and strain field estimation is presented, and detailed analyses of the measurement accuracy considering the influences of both experimental conditions and algorithm details are provided.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.read more
Citations
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Journal ArticleDOI
Digital Image Correlation of 2D X-ray Powder Diffraction Data for Lattice Strain Evaluation
Hongjia Zhang,Tan Sui,Enrico Salvati,Dominik Daisenberger,Alexander J.G. Lunt,Kai Soon Fong,Xu Song,Alexander M. Korsunsky +7 more
TL;DR: The XRD-DIC approach simplifies the analysis process by skipping 2D to 1D conversion, and opens new possibilities for robust 2D powder diffraction data analysis for full in-plane strain evaluation.
Journal ArticleDOI
Photogrammetry-based two-dimensional digital image correlation with nonperpendicular camera alignment
TL;DR: Using this method, not only is the measurement error caused by oblique-axis compensated, but also the displacement in millimeters rather than in pixels can be determined directly.
Journal ArticleDOI
Enhanced feature-based path-independent initial value estimation for robust point-wise digital image correlation
TL;DR: This work introduces an enhanced feature-based path-independent initial value estimation (PI-IVE) method for an accurate subpixel iterative algorithm, which is achieved by a variant of PatchMatch algorithm in the feature image generated from the speckle pattern image.
Journal ArticleDOI
Size effects on the characteristics of fracture process zone of plain concrete under three-point bending
TL;DR: In this article, the size effects on the characteristics of fracture process zone (FPZ) of plain concrete, including its physical features and softening behavior, were investigated, and an empirical tension softening model and corresponding size independent parameters were obtained based on the estimated TSCs of different sizes specimens.
Journal ArticleDOI
Biaxial tensile-compressive loading of unnotched and open-hole carbon epoxy crossply laminates:
Umeyr Kureemun,M. Ridha,Te Tay +2 more
TL;DR: In this paper, the behavior of unnotched and open-hole unidirectional carbon epoxy crossply laminates under various off-axis biaxial tension-compression loadings is studied using a mixed experimental and numerical approach.
References
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Surfaces generated by moving least squares methods
Peter Lancaster,K. Salkauskas +1 more
TL;DR: In this article, an analysis of moving least squares (m.l.s.) methods for smoothing and interpolating scattered data is presented, in particular theorems concerning the smoothness of interpolants and the description of m. l.s. processes as projection methods.
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Applications of digital-image-correlation techniques to experimental mechanics
Journal ArticleDOI
Digital Particle Image Velocimetry
Christian Willert,Morteza Gharib +1 more
TL;DR: In this article, the directional ambiguity associated with PIV and LSV is resolved by implementing local spatial cross-correlations between two sequential single-exposed particle images, and the recovered velocity data are used to compute the spatial and temporal vorticity distribution and the circulation of the vortex ring.
Journal ArticleDOI
Digital Imaging Techniques In Experimental Stress Analysis
W. H. Peters,W. F. Ranson +1 more
TL;DR: In this paper, the surface displacement components in laser speckle metrology were measured using a digital image scanner interfaced to a computer. Butt et al. used a boundary integral equation method to calculate surface traction in the contour.
Journal ArticleDOI
Digital image correlation using Newton-Raphson method of partial differential correction
TL;DR: In this paper, the authors developed and limited experimental verification of a method which can determine displacements and gradients using the Newton-Raphson method of partial corrections, which was shown to be accurate in determining displacement and certain gradients, while using significantly less CPU time than the current coarse-fine search method.