Digital image correlation using iterative least squares and pointwise least squares for displacement field and strain field measurements

Pan, Bing; Asundi, Anand; Xie, Huimin; Gao, Jianxin

doi:10.1016/j.optlaseng.2008.10.014

Cited by 377 publications

(194 citation statements)

References 14 publications

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“…1, Step B). In both steps a Zero Normalized Least Square Matching (ZN-LSM) algorithm [56] has been used through the use of the software Davis (version 8.3.0); this algorithm is efficient and has the advantage of being robust to intensity changes between images. The Step A analysis is performed with a subset size chosen to give a good compromise between low uncertainty in the calculated displacements and sufficient spatial resolution; a relatively large subset size tends to be used (such as 64 × 64 pixels to 128 × 128 pixels).…”

Section: Methods For Analysis Of Dic-measured Full Field Displacementsmentioning

confidence: 99%

J-Integral Calculation by Finite Element Processing of Measured Full-Field Surface Displacements

et al. 2017

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A novel method has been developed based on the conjoint use of digital image correlation to measure full field displacements and finite element simulations to extract the strain energy release rate of surface cracks. In this approach, a finite element model with imported full-field displacements measured by DIC is solved and the J-integral is calculated, without knowledge of the specimen geometry and applied loads. This can be done even in a specimen that develops crack tip plasticity, if the elastic and yield behaviour of the material are known. The application of the method is demonstrated in an analysis of a fatigue crack, introduced to an aluminium alloy compact tension specimen (Al 2024, T351 heat condition).

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Section: Methods For Analysis Of Dic-measured Full Field Displacementsmentioning

confidence: 99%

J-Integral Calculation by Finite Element Processing of Measured Full-Field Surface Displacements

et al. 2017

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“…[21,25,26], few studies have been carried out to validate the strain field measured at the microstructural scale, especially under large deformation, through a comparison with results obtained from a separate experimental technique [21].…”

Section: Introductionmentioning

confidence: 99%

Quantitative Strain Analysis of the Large Deformation at the Scale of Microstructure: Comparison between Digital Image Correlation and Microgrid Techniques

2012

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A comparative study has been carried out to assess the accuracy of the Digital Image Correlation (DIC) technique for the quantification of large strains in the microstructure of a Interstitial Free (IF) steel used in automotive applications. A microgrid technique has been used in this study in order to validate independently the strain measurements obtained with DIC. Microgrids with a pitch of 5 microns were printed on the etched microstructure of the IF steel to measure the local in-plane strain distribution during a tensile test carried out in a Scanning Electron Microscope (SEM). The progressive deformation of the microstructure with microgrids has been recorded throughout the test as a sequence of micrographs and subsequently processed using DIC to quantify the distribution of local strain values. Strain maps obtained with the two techniques have been compared in order to assess the accuracy of the DIC measurements obtained using the natural patterns of the revealed microstructure in the SEM micrographs. Although results obtained with the two techniques are qualitatively similar, therefore demonstrating the reliability of DIC applied to microstructures, even after large deformations in excess of 0.7. However, an average error of about 16% was found in the strain values calculated using DIC.

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“…Formula 4 is design formula of Reynolds when otter board by flow, where " v " represents the inflow velocity, " l " represents wing chord, and " " represents the kinematic viscosity. Reynolds was obtained by formula 4, and its value changed within the range from 938 to 4727, at this point Reynolds in SCHAZ, while boundary layer is laminar separation, and the wake was turbulent vortex street (Pan B et al, 2009).…”

Section: Hydrodynamic Performance Analysis Of Changes Attack Anglesmentioning

confidence: 99%

“…The Japanese scholars studied hydrodynamic performance of the double-wing otter board in different aspect ratio and guide plate curvature, concluded that rectangular "V" style otter board is better than the rectangle (Wei Z G et al, 2011) (Pan B et al, 2009). Domestic scholars Xu Baosheng etc did the production test and drew a conclusion that rectangular "V" style curved otter board is better than the "V" style otter board in the expansivity and efficiency.…”

Section: Introductionmentioning

confidence: 99%

The Numerical Simulation of High Aspect Ratio Vertical SLAT Type Otter Board

Yuan¹,

Ma²,

Qi³

et al. 2016

Proceedings of the 2016 4th International Conference on Mechanical Materials and Manufacturing Engineering

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Fluid simulation software FLUENT was used to study the flow distribution of vertical SLAT type otter board, when the SLAT angle (θ) ranging from 28 to 40 degree, and analyzed the relationship between SLAT angle and lift coefficient, drag coefficient, lift-to-drag ratio. Simulated the flow distribution in different attack angles (α) when the velocity at 1.54 m/s, analyzed the relationship between attack angles and lift coefficient, drag coefficient, lift-to-drag ratio. Also simulated the dynamics parameters when the velocity changing from 0.51 to 2.57 m/s, analyzed the relationship between Reynolds and lift coefficient, drag coefficient, lift-to-drag ratio. Aimed at provided theoretical help for the design and improvement of the otter board. KEYWORD: vertical SLAT type otter board; numerical simulation; hydrodynamic performance 4th International Conference on Mechanical Materials and Manufacturing Engineering (MMME 2016)

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Digital image correlation using iterative least squares and pointwise least squares for displacement field and strain field measurements

Cited by 377 publications

References 14 publications

J-Integral Calculation by Finite Element Processing of Measured Full-Field Surface Displacements

J-Integral Calculation by Finite Element Processing of Measured Full-Field Surface Displacements

Quantitative Strain Analysis of the Large Deformation at the Scale of Microstructure: Comparison between Digital Image Correlation and Microgrid Techniques

The Numerical Simulation of High Aspect Ratio Vertical SLAT Type Otter Board

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