Finite Element Stereo Digital Image Correlation Measurement for a Plate Model

Abstract : In this study, a Stereo Digital Image Correlation method is used to measure boundary conditions for a plate model. For a plate model, boundary conditions are displacements but also rotations. For instance, the rotations can be obtained by a posteriori numerical differentiation. Since the measured displacement is noisy, filtering or smoothing techniques are required even if they usually do not consider the mechanical nature of the measured field. In this work, a plate Finite Element model is preferred to regularise the Stereo DIC measurement. Classically [Horn and Schunck (1981), Sutton et al. (1983)], the optical flow problem is written in a weak form over a region called Region of Interest (ROI) which is usually defined by a subset of the reference state image. For one increment of Stereo DIC [Garcia et al. (2002)], two image registrations are performed independently. Both correlation problems involve unknowns that are not directly related to the physical (3D) displacement U calculated after triangulation and 3D shape variation. The stereo DIC problem is reformulated in the world reference system so as to have U as a unique unknown. It is therefore possible to add a mechanical regularization [Roux et al, (2009), Rethore 10, Leclerc et al, (2011)] to this dedicated measurement and to measure directly displacements and rotations. The long-term goal is to perform multiscale identification following the approach [Passieux et al, (2015)] in 2D-DIC.
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Submitted on : Monday, February 25, 2019 - 12:44:56 PM
Last modification on : Friday, January 10, 2020 - 9:09:47 PM

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  • HAL Id : hal-02047983, version 1

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J.-E. Pierré, Jean-Charles Passieux, Jean-Noël Périé. Finite Element Stereo Digital Image Correlation Measurement for a Plate Model. SEM XIII International Congress, Orlando, Floride, 2016, Orlando, France. pp.199-202. ⟨hal-02047983⟩

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