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Analyse de la tenue mécanique d'un liner en titane : apport des mesures de champs cinématiques

Abstract : Field measurement techniques, and more particularly those based on Digital Image Correlation (DIC), are mature techniques for the determination of displacements of two or three-dimensional objects. The goal of this work is to develop test and associated identification DIC-based techniques to identify the mechanical behavior of a commercially-pure titanium liner, conceived for spatial applications. Uniaxial tensile teste are first used to identify the elasto-plastic behavior of this material. Several identification methods are compared. It is especially proposed to extend said "integrated" Digital Image Correlation to elasto-plastic cases. This methods allows to identify directly the displacement of the observed solid and the mechanical parameters of the constituting material. It is compared to a reference updating method. The crack initiation is then studied in this material. Some zones of the liner will be submitted to a plastic cyclic deformation, that has to be reproduced experimentally. A dedicated test has been conceived, allowing to apply a negative load ratio to the thin sheet. An estimation of the initiation limit has been obtained for this material. Finally, the crack propagation in the liner has been studied, using dedicated techniques. Some of these have been quantitatively compared, to study their respective capabilities. Paris' propagation laws have been identified directly from a set of raw images of the crack tip vicinity.
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Submitted on : Thursday, July 18, 2013 - 5:12:14 PM
Last modification on : Friday, April 15, 2022 - 3:37:14 AM
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  • HAL Id : tel-00846252, version 1

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Florent Mathieu. Analyse de la tenue mécanique d'un liner en titane : apport des mesures de champs cinématiques. Autre. École normale supérieure de Cachan - ENS Cachan, 2013. Français. ⟨NNT : 2013DENS0007⟩. ⟨tel-00846252⟩

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