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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Experimental investigation of the systematic error on photomechanic methods induced by camera self-heating
Qinwei Ma,Shaopeng Ma +1 more
TL;DR: The experimental results showed that the thermal expansion of the camera outer case and lens mount, instead of mechanical components within the camera, were the main reason for image expansion.
Journal ArticleDOI
Mechanical Properties Identification of Sheet Metals by 2D-Digital Image Correlation Method
TL;DR: In this paper, an in-house 2D-DIC system is developed to measure Young's modulus, Poisson's ratio, anisotropic plastic ratio parameters and flow curve under uniaxial tension of AL5052-O and high strength steel (DP980) sheets in rolling direction.
Journal ArticleDOI
Optical measurement of the dynamic strain field of a fan blade using a 3D scanning vibrometer
Cedric Vuye,Cedric Vuye,Steve Vanlanduit,Flavio Presezniak,Gunther Steenackers,Patrick Guillaume +5 more
TL;DR: In this article, a 3D-scanning laser doppler vibrometer (3D-SLDV) is used to measure the 3D displacement of a fan blade, which is then used to calculate the dynamic strain distributions.
Journal ArticleDOI
Optical visualization of strain development and fracture propagation in laminated rocks
Fatick Nath,Mehdi Mokhtari +1 more
TL;DR: In this article, the authors applied optical techniques along with image processing to measure strain on the surface of laminated Green River shale samples with various lamination angles under indirect tensile testing conditions.
Journal ArticleDOI
Experimental characterization of strain localization in rock
TL;DR: The two factors, DRASC and Lf, are proposed to characterize the evolution of damage and localization and can be used to well reflect the damage evolution and strain localization of rock specimens under compression.
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.