Stéréo corrélation d'images numériques éléments finis : application à la validation de modèles de structures composites sous sollicitations complexes

Abstract : VERTEX Project, to which this thesis belongs, aims to validate composite models by multi-axial static tests on specimens at the level of structural details. The positioning on this scale requires the development of both new instrumentation techniques and tools for the test/simulation dialogue, which are at the heart of this thesis. Given the complexity of this type of experiments, we focus here on Stereo Digital Image Correlation (SDIC) since it yields 3D displacement fields on the surface of the specimen. However, if we stick to conventional approaches, it is difficult to make quantitative comparisons between a measured field and a Finite Element (FE) simulated field. Thus, in this work, a framework is developed to make a measurement by SDIC in the physical coordinate system based on an FE model (calibration of non-linear camera models , FE shape measurement, FE field measurement). This method gives access to experimental displacement fields directly expressed both in the coordinate system and support of the FE simulation, which considerably simplifies validation. To validate a model at the scale of structural details, the question of boundary conditions is fundamental. This question is even more complex since the kinematic measurement is limited to the visible surface. In addition to this surface measurement, it is here envisioned to estimate additionally the boundary conditions in the thickness of the specimen relying on a plate/shell-like model (classic or volume). Different approaches are considered depending on the confidence giving to this model. This methodology is implemented in an academic software and is applied to synthetic tests. The development of a dedicated instrumentation also allowed the analysis of tests performed on the VERTEX bench.
Complete list of metadatas

Cited literature [13 references]  Display  Hide  Download

https://tel.archives-ouvertes.fr/tel-01688188
Contributor : Abes Star <>
Submitted on : Friday, January 19, 2018 - 10:56:07 AM
Last modification on : Tuesday, October 22, 2019 - 5:20:43 PM
Long-term archiving on : Thursday, May 24, 2018 - 7:40:41 AM

File

2016tou30291bis.pdf
Version validated by the jury (STAR)

Identifiers

  • HAL Id : tel-01688188, version 1

Citation

Jean-Emmanuel Pierré. Stéréo corrélation d'images numériques éléments finis : application à la validation de modèles de structures composites sous sollicitations complexes. Génie mécanique [physics.class-ph]. Université Paul Sabatier - Toulouse III, 2016. Français. ⟨NNT : 2016TOU30291⟩. ⟨tel-01688188⟩

Share

Metrics

Record views

173

Files downloads

1637