CAD-based Displacement Measurements with Stereo-DIC

Dufour, John-Eric; Beaubier, B.; Hild, François; Roux, Stéphane

doi:10.1007/s11340-015-0065-6

Cited by 50 publications

(48 citation statements)

References 31 publications

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“…In this section, particular care is taken to provide a global formalism that is suitable for both standard Finite Element Digital Image Correlation (FE-DIC [35,7]) and the newly developed Finite Element Stereo Digital Image Correlation (FE-SDIC [13,28,33]). …”

Section: Incremental Approachmentioning

confidence: 99%

“…Here, we propose to use a Finite Element based Digital Image Correlation (FE-DIC) method. The recent developments in the field of FE-DIC [35,7] and the even more recent advances in Finite Element Stereo DIC (FE-SDIC) [13,29,28,33] allow a direct link with the simulation tools. It is thus possible to share the same FE mesh during the calculation and the measurement, in the aim of (a) greatly simplifying the bridge between simulation and experimentation, and (b) limiting the uncertainties associated with reprojection.…”

Section: Introductionmentioning

confidence: 99%

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A Space-Time PGD-DIC Algorithm:

2018

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The aim of this study is to develop a new regularized Digital Image Correlation (DIC) method for time dependent measurements. The correlation problem is written as a minimization problem over the space-time domain in a general formulation including 2D-DIC and Stereo DIC (SDIC). The unknown time-resolved displacement field is found as a sum of products of space and time functions, similarly to the Proper Generalized Decomposition in computational mechanics. It is shown that the space fields are less sensitive to noise as time regularity acts as a physical regularization of the space fields. The proposed method is illustrated by vibration measurement under harmonic excitation in 2D-DIC and SDIC.

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Section: Incremental Approachmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Space-Time PGD-DIC Algorithm:

2018

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“…[29] is followed and generalized. The latter allows to work in the parametric space of the mathematical representation of the object of interest (e.g., with Non-Uniform Rational B-Splines, or NURBS [30]).…”

Section: Introductionmentioning

confidence: 99%

“…Once the 3D surface is reconstructed, it is possible to perform 3D displacement measurements. Using NURBS provides the advantage of measuring 3D surface motions and deformations with a low number of control points (i.e., kinematic degrees of freedom) via global SC [29].…”

Section: Introductionmentioning

confidence: 99%

Hybrid Stereocorrelation Using Infrared and Visible Light Cameras

et al. 2016

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3D kinematic fields are measured using an original stereovision system composed of one infrared (IR) and one visible light camera. Global stereocorrelation (SC) is proposed to register pictures shot by both imaging systems. The stereo rig is calibrated by using a NURBS representation of the 3D target. The projection matrices are determined by an integrated approach. The effect of gray level and distortion corrections is assessed on the projection matrices. SC is performed once the matrices are calibrated to measure 3D displacements. Amplitudes varying from 0 to 800 µm are well captured for in-plane and out-ofplane motions. It is shown that when known rigid body translations are applied to the target, the calibration can be improved when its actual metrology is approximate. Applications are shown for two different setups for which the resolution of the IR camera has been modified.

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“…In this paper this formulation is not fully exploited since it is not used for calibration and shape measurement. A very similar global stereo formulation based on IsoGeometric Analysis (IGA) was proposed in [1,3]. It is used not only for the displacement measurement, but also for calibration of a linear camera model and shape measurement.…”

Section: Introductionmentioning

confidence: 99%

Finite Element Stereo Digital Image Correlation: Framework and Mechanical Regularization

2016

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The use of Finite Element meshes in Digital Image Correlation (FE-DIC) is now widespread in experimental mechanics. Up to now FE have been much less used in Stereo-DIC. The first goal of this paper is to explain in details how to use FE in Stereo-DIC using a formulation in the physical coordinate system. More precisely, it is shown how to perform the calibration of possibly nonlinear models, shape and displacement measurement based on a FE mesh. In addition it is shown that with such a framework it is possible to regularise the measurement with a FE model based on the same mesh. For instance, using this technique, it is shown that it is possible to measure the rotation field of a bending plate in addition to its displacement.

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CAD-based Displacement Measurements with Stereo-DIC

Cited by 50 publications

References 31 publications

A Space-Time PGD-DIC Algorithm:

A Space-Time PGD-DIC Algorithm:

Hybrid Stereocorrelation Using Infrared and Visible Light Cameras

Finite Element Stereo Digital Image Correlation: Framework and Mechanical Regularization

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