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
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Journal ArticleDOI
Interpretation of quasi-static and dynamic tensile behavior by digital image correlation technique in TWinning Induced Plasticity (TWIP) and low-carbon steel sheets
TL;DR: In this paper, a digital image correlation (DIC) technique was used for detailed dynamic deformation analyses of automotive steel sheets, and the results indicated that the deformation processes were almost similar to the quasi-static ones as the TWIP sheet was homogeneously deformed in the initial and intermediate deformation stages.
Journal ArticleDOI
Multiscale modeling of the elasto-plastic behavior of architectured and nanostructured Cu-Nb composite wires and comparison with neutron diffraction experiments
Tang Gu,J.-R. Medy,Vincent Klosek,Olivier Castelnau,Samuel Forest,Eveline Herve-Luanco,F. Lecouturier–dupouy,Henry Proudhon,P.O. Renault,Ludovic Thilly,Patrick Villechaise +10 more
TL;DR: In this paper, the effective elasto-plastic behavior of nanostructured and architectured copper niobium composite wires is investigated using two different approaches to model the microstructural features: full-field finite elements and mean-field modeling.
Journal ArticleDOI
Performances of different subset shapes and control points in subset-based digital image correlation and their applications in boundary deformation measurement
TL;DR: It is shown that different choices of subset shapes can greatly affect the registration accuracy, while different choices for the locations of control points have little impact on it, and the noncentral algorithm is developed for the whole-field deformation measurement.
Journal ArticleDOI
Performance of iterative gradient-based algorithms with different intensity change models in digital image correlation
Xiao-Yong Liu,Xiao-Yong Liu,Qingchang Tan,Lei Xiong,Guodong Liu,Jian-Ying Liu,Xin Yang,Chun-Yan Wang,Chun-Yan Wang +8 more
TL;DR: Three iterative gradient-based algorithms for intensity variation are given using the corresponding intensity change model and the iterative least squares (ILS) solving method and it is revealed that the algorithm generated using the non-linear intensity changemodel is the most accurate, robust and efficient of the three algorithms.
Journal ArticleDOI
Serviceability Assessment of Masonry Arch Bridges Using Digital Image Correlation
TL;DR: In this paper, the serviceability of two aged masonry arch bridges under operating passenger and freight trains was assessed using a digital image correlation method using three lasers recorded the passage of the wheels; these data were used to ascertain the wheel positions.
References
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Journal ArticleDOI
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.