Effects Of Subpixel Image Restoration On Digital Correlation Error Estimates

Sutton, Michael A.; McNeill, Stephen R.; Jang, Jinseng; Babai, Majid

doi:10.1117/12.7976778

Cited by 215 publications

(133 citation statements)

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“…Due to digitization of the captured images, assumption of the subset's deformed shape and the systematic errors from the experimental set-up, various potential errors occur in the DIC technique. In 1988, Sutton et al [49] performed the first modelling works to identify the factors which influence the accuracy of DIC technique. In their work, a selected subset was deformed by known values and the model was examined numerically.…”

Section: Accuracy Analysis Of Two-dimensional Digital Image Correlationmentioning

confidence: 99%

A Review of Surface Deformation and Strain Measurement Using Two-Dimensional Digital Image Correlation

Khoo¹,

Karuppanan²,

Tan³

2016

Metrology and Measurement Systems

110

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Among the full-field optical measurement methods, the Digital Image Correlation (DIC) is one of the techniques which has been given particular attention. Technically, the DIC technique refers to a non-contact strain measurement method that mathematically compares the grey intensity changes of the images captured at two different states: before and after deformation. The measurement can be performed by numerically calculating the displacement of speckles which are deposited on the top of object's surface. In this paper, the Two-Dimensional Digital Image Correlation (2D-DIC) is presented and its fundamental concepts are discussed. Next, the development of the 2D-DIC algorithms in the past 33 years is reviewed systematically. The improvement of 2D-DIC algorithms is presented with respect to two distinct aspects: their computation efficiency and measurement accuracy. Furthermore, analysis of the 2D-DIC accuracy is included, followed by a review of the DIC applications for two-dimensional measurements.

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Section: Accuracy Analysis Of Two-dimensional Digital Image Correlationmentioning

confidence: 99%

A Review of Surface Deformation and Strain Measurement Using Two-Dimensional Digital Image Correlation

Khoo¹,

Karuppanan²,

Tan³

2016

Metrology and Measurement Systems

110

View full text Add to dashboard Cite

show abstract

“…Digital image correlation (DIC) is a full-field optical technique which provides spatially continuous measurement of displacements across the surface of the specimen. DIC relies on correlation of the random pattern of speckles between images of the deformed and reference (undeformed) configurations of the specimen within small neighborhoods called subsets [27][28]. A sprayed-on speckle pattern was created on the surface of the beam without the shear stirrups.…”

Section: Experimental Programmentioning

confidence: 99%

Shear behavior of steel fiber reinforced concrete using full-field displacements from digital image correlation

Gali

Subramaniam

2017

MATEC Web Conf.

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Abstract. Reinforced concrete beams with discrete hooked-end steel fibers at 0.5% volume fraction are tested with a shear span to depth (a/d) ratio equal to 1.8. Digital image correlation (DIC) technique was used to obtain the full-filed displacements from the beam. The formation and propagation of a shear crack which directly influences the load response and the peak load in the load response of the beam is monitored using the displacement information available from DIC. There is a continuous increase in slip across the crack faces with increasing load, which produces an increase in the crack opening. The dilatant behavior indicated by the proportion of crack opening to slip displacement obtained from the control and the SFRC beams is identical. Failure in control beams is brittle and was produced by the opening of dominant shear crack within the shear span. At the peak load, the shear crack pattern in fiber reinforced concrete is identical to the crack pattern in the control beam. The fiber reinforced concrete beams exhibit post peak load carrying capacity with continued slip of the dominant shear crack. The crack bridging stress provided by the fibers results in a significant increase shear transfer across the crack which provides significant post-peak load carrying capacity with increasing slip of the shear crack.

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“…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.…”

Section: Digital Image Correlationmentioning

confidence: 99%

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

Gali

Subramaniam

2017

Int J Concr Struct Mater

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An experimental evaluation of crack propagation and post-cracking behavior in steel fiber reinforced concrete (SFRC) beams, using full-field displacements obtained from the digital image correlation technique is presented. Surface displacements and strains during the fracture test of notched SFRC beams with volume fractions (V f ) of steel fibers equal to 0.5 and 0.75% are analyzed. An analysis procedure for determining the crack opening width over the depth of the beam during crack propagation in the flexure test is presented. The crack opening width is established as a function of the crack tip opening displacement and the residual flexural strength of SFRC beams. The softening in the post-peak load response is associated with the rapid surface crack propagation for small increases in crack tip opening displacement. The load recovery in the flexural response of SFRC is associated with a hinge-type behavior in the beam. For the stress gradient produced by flexure, the hinge is established before load recovery is initiated. The resistance provided by the fibers to the opening of the hinge produces the load recovery in the flexural response.

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Effects Of Subpixel Image Restoration On Digital Correlation Error Estimates

Cited by 215 publications

References 0 publications

A Review of Surface Deformation and Strain Measurement Using Two-Dimensional Digital Image Correlation

A Review of Surface Deformation and Strain Measurement Using Two-Dimensional Digital Image Correlation

Shear behavior of steel fiber reinforced concrete using full-field displacements from digital image correlation

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

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