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
Laboratory Determination of Rock Fracture Shear Stiffness Using Seismic Wave Propagation and Digital Image Correlation
Ahmadreza Hedayat,Gabriel Walton +1 more
TL;DR: In this paper, a direct shear experiment was conducted on Indiana limestone specimens to investigate the stiffness of rock discontinuities (fractures) approaching shear failure, where compressional and shear wave pulses were transmitted through and reflected from the discontinuity.
Journal ArticleDOI
py2DIC: A New Free and Open Source Software for Displacement and Strain Measurements in the Field of Experimental Mechanics.
Valeria Belloni,Roberta Ravanelli,Andrea Nascetti,Martina Di Rita,Domitilla Mattei,Mattia Crespi +5 more
TL;DR: The results demonstrate the possibility of successfully characterizing the deformation mechanism of the investigated materials, highlighting the pros and cons of each software package.
Journal ArticleDOI
Full-field measurement of residual strains in cold bent steel plates
TL;DR: In this paper, a 3D Digital Image Correlation (DIC) was used to measure residual strains in 18 cold bent 12.7mm thick ASTM A36 steel plates, bending using a press-brake to a constant radius of 102mm with varying angles (10, 20, and 30 degrees) and plate widths (76.2mm and 203mm).
DissertationDOI
Hydro-mechanically coupled processes in heterogeneous fractures: experiments and numerical simulations
TL;DR: In this article, the authors investigated fracture behavior in crystalline rock, such as granite and granodiorite, by investigating: (1) differences in fracture topography linked to fracture size and nature; (2) Hydromechanically coupled processes in heterogeneous fractures in experiments on the laboratory scale; and (3) Hydro-mechanically coupled process in fracture simulations on the field scale.
Journal ArticleDOI
Investigation of effective stress intensity factors during overload fatigue cycles using photoelastic and DIC techniques
TL;DR: In this paper, the effect of single overload cycles applied during constant amplitude fatigue was investigated using DIC and photoelastic techniques, and the CJP model of crack tip stress and displacement fields was calculated using the model of wake contact and compatibility-induced influences on the applied elastic field arising from the plastic enclave generated around a fatigue crack.
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.
Journal ArticleDOI
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.