Mechanically regularized Finite Element Stereo DIC: framework and application for structural testings

International audienceThe aim of this study is to measure, with stereo digital image correlation (DIC), 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 filtering. Unfortunately additional uncertainties may arise with these steps. In this work, a finite element model is proposed to regularize a stereo FE-DIC measurement. For that, a complete framework of the DIC problem using the 3D displacement as primary unknown is developped. The approach can handle as many cameras as necessary and encompasses the calibration