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CAD-based Displacement Measurements with Stereo-DIC

Principle and First Validations

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Abstract

A new displacement measurement technique is proposed in a stereovision setup, which uses the object of interest as the support of the correlation process. This procedure leads to a global approach to stereocorrelation. The method is presented in its general formulation and is then particularized to the case of non uniform rational B-splines (NURBS). The displacement field is directly measured as a 3D field expressed in a NURBS basis consistent with the existing geometric model. The kinematic measurements are validated against prescribed displacements of a machined Bézier patch. The feasibility in an industrial context is shown with the analysis of 3D displacement fields of a 2- m2 automotive roof panel during a welding operation.

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Acknowledgments

This work was partly supported by PSA-Peugeot-Citroën, by a grant from Région Île-de-France, and under the PRC Composites, French research project funded by DGAC, involving SAFRAN Group, ONERA and CNRS.

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Correspondence to John-Eric Dufour.

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Dufour, JE., Beaubier, B., Hild, F. et al. CAD-based Displacement Measurements with Stereo-DIC. Exp Mech 55, 1657–1668 (2015). https://doi.org/10.1007/s11340-015-0065-6

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  • DOI: https://doi.org/10.1007/s11340-015-0065-6

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