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A Global Formulation to Stereo Digital Image Correlation with Mechanical Regularisation

Abstract : The aim of this study is to measure, with stereo digital image correlation, the displacements and rotations at the boundary of a plate subjected to complex loadings. With classical DIC techniques, the measured field is the displacement of the upper skin only. The rotations are usually estimated a posteriori by numerical differentiation and smoothing. Unfortunately additional uncertainties may arise with these steps. Conversely, the use of a finite element model is proposed here to regularise a stereo FE-DIC measurement. For that a formulation using the 3D displacement as primary unknown is introduced. It requires projection operators based on a pinhole camera model. It is shown that it is possible to take into account distortions directly. Associated to this formulation a more accurate quadrature technique is used avoiding a systematic bias.
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Submitted on : Thursday, February 28, 2019 - 3:51:05 PM
Last modification on : Wednesday, June 24, 2020 - 4:18:56 PM


  • HAL Id : hal-02052663, version 1


J.-E. Pierré, Jean-Charles Passieux, Jean-Noël Périé, Florian Bugarin, L. Robert. A Global Formulation to Stereo Digital Image Correlation with Mechanical Regularisation. PhotoMechanics 2015, Delft, NL, 2015, Delft, France. ⟨hal-02052663⟩



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