Use of rigid-body motion for the investigation and estimation of the measurement errors related to digital image correlation technique

Haddadi, H.; Belhabib, Sofiane

doi:10.1016/j.optlaseng.2007.05.008

Cited by 211 publications

(124 citation statements)

References 23 publications

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“…Relative displacements ∆L in x and y directions were calculated, after image calibration, at a mesh grid of 225 (15 × 15) points, with subset size of 61 × 61 pixels and 20 pixel overlapping. Relative displacements computed by means of infrared image correlation are influenced by unavoidable small rigid body translations [11] that occur during the thermal expansion of the test specimen, which was placed into the heating device without restraint. This effect must be corrected in order to get pure thermal expansion of the test specimen.…”

Section: Methodsmentioning

confidence: 99%

A new method for the determination of the coefficient of thermal expansion of solid materials

Montanini¹,

Freni²

2012

Proceedings of the 2012 International Conference on Quantitative InfraRed Thermography

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A new experimental method (IIC, Infrared Image Correlation) for quick assessment of the coefficients of thermal expansion of solid materials is presented. The proposed method is based on performing a digital image correlation between thermal images acquired at different temperatures by means of an infrared camera. It allows the coefficient of thermal expansion of both isotropic and anisotropic bulk materials to be determined by measuring simultaneously the fractional increase in length and the actual thermal field over a small region of interest in which a dual-emissivity stochastic speckle pattern has been created. First results reported in this paper prove the effectiveness of the proposed method that can be applied either to carry out reference measurements in laboratory or to evaluate thermal stresses and strains on structural components in-field.

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Section: Methodsmentioning

confidence: 99%

A new method for the determination of the coefficient of thermal expansion of solid materials

Montanini¹,

Freni²

2012

Proceedings of the 2012 International Conference on Quantitative InfraRed Thermography

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“…Errors related to the measurement setup and DIC technique (e.g. out-of-plane displacement/ focus, optical lens distortion; Bornert et al, 2009;Haddadi and Belhabib, 2008;Pan et al, 2009) can be considered relatively small due to proper sample alignment, small field of views analysed (o3 mm Â 1.5 mm) and large working distance (80 mm) between camera and object. The average local Green-Lagrangian shear strain of the three different skin strain profiles shown in Fig.…”

Section: Measurement Performance/uncertaintymentioning

confidence: 99%

A novel method for visualising and quantifying through-plane skin layer deformations

Gerhardt

Schmidt

Sanz-Herrera

et al. 2012

Journal of the Mechanical Behavior of Biomedical Materials

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“…Second, there is complex interplay between displacement error, strain error, and the parameters chosen for the speckle pattern, image correlation and strain calculation [1,3,4,[16][17][18][19][20]. Although several studies have attempted to quantify these relationships, most have been limited to correlation errors arising from rigid body translations [17,21] or no motion at all [4]. Simulated experiments in which displacements are applied numerically to a computer-generated image have also been conducted [3,18,19,22].…”

Section: Introductionmentioning

confidence: 99%

Optimization of Digital Image Correlation for High-Resolution Strain Mapping of Ceramic Composites

2012

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Digital image correlation (DIC) is assessed as a tool for measuring strains with high spatial resolution in woven-fiber ceramic matrix composites. Using results of mechanical tests on aluminum alloy specimens in various geometric configurations, guidelines are provided for selecting DIC test parameters to maximize the extent of correlation and to minimize errors in displacements and strains. The latter error is shown to be exacerbated by the presence of strain gradients. In a case study, the resulting guidelines are applied to the measurement of strain fields in a SiC/SiC composite comprising 2-D woven fiber. Sub-fiber tow resolution of strain and low strain error are achieved. The fiber weave architecture is seen to exert a significant influence over strain heterogeneity within the composite. Moreover, strain concentrations at tow crossovers lead to the formation of macroscopic cracks in adjacent longitudinal tows. Such cracks initially grow stably, subject to increasing app lied stress, but ultimately lead to composite rupture. Once cracking is evident, the composite response is couched in terms of displacements, since the computed strains lack physical meaning in the vicinity of cracks. DIC is used to identify the locations of these cracks (via displacement discontinuities) and to measure the crack opening displacement profiles as a function of applied stress.

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Use of rigid-body motion for the investigation and estimation of the measurement errors related to digital image correlation technique

Cited by 211 publications

References 23 publications

A new method for the determination of the coefficient of thermal expansion of solid materials

A new method for the determination of the coefficient of thermal expansion of solid materials

A novel method for visualising and quantifying through-plane skin layer deformations

Optimization of Digital Image Correlation for High-Resolution Strain Mapping of Ceramic Composites

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