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Caractérisation et quantification de surfaces par stéréocorrélation pour des essais mécaniques du quasi statique à la dynamique ultra-rapide

Abstract : The use of optical methods is growing in the field of solid mechanics. In particular, the stereocorrelation technique is appealing because its use is reasonably easy, it is a non intrusive method, and its spatial and temporal resolutions are usually very good. In this work, the stereocorrelation technique is utilized for different types of loading rates concerning quasi static experiments up to ultra high speed tests. This important field of application requires the development of several specific tools to obtain quantitative results (e.g., shape, displacement and strain fields). Special methods for the calibration and optical distortions corrections are implemented. A new registration method is also introduced to deal with low spatial / high temporal resolutions. To perform the spatial matching, a correction method associated with large displacement levels, based on a numerical simulation, was developed. To characterize the method, several tests are analyzed, namely, quasi static compression on a composite material, quasi static tensile test on a tantalum plate, dynamic tensile tests on aluminum alloy samples. The main high speed experiments studied herein are cylinder expansions. For this type test, a representative synthetic case is first considered to characterize the a priori performance of the technique under very difficult experimental conditions. The technique is subsequently applied to the analysis of field data. For all the applications, the reconstruction uncertainty is quantified so that the roughness of the reconstructed surface can be estimated and, thus, the necking phenomena.
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https://tel.archives-ouvertes.fr/tel-00538904
Contributor : Ens Cachan Bibliothèque <>
Submitted on : Tuesday, November 23, 2010 - 2:56:51 PM
Last modification on : Thursday, December 10, 2020 - 10:58:03 AM
Long-term archiving on: : Friday, December 2, 2016 - 10:44:05 PM

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  • HAL Id : tel-00538904, version 1

Citation

Gilles Besnard. Caractérisation et quantification de surfaces par stéréocorrélation pour des essais mécaniques du quasi statique à la dynamique ultra-rapide. Mécanique [physics.med-ph]. École normale supérieure de Cachan - ENS Cachan, 2010. Français. ⟨NNT : 2010DENS0006⟩. ⟨tel-00538904⟩

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