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Étude du comportement mécanique des matériaux dans des conditions étendues de vitesses et de températures : application à l'acier C68 dans le cas d'une opération de formage incrémental

Abstract : The aim of this thesis work is the characterization and the modelisation of the thermo-mechanical behaviour of a high-carbon steel with loading conditions corresponding to those imposed by a forming process at 720°C. The renewal interest for this kind of industrial process comes from the fact that they use less energy and provide a ratio of material valued/raw material interesting to improved mechanical properties of the formed part. The use of numerical tool becomes today an interesting solution to optimize the development process. Its application requires a detailed description of the material behaviour in the loading conditions of the process, that is over a wide range of strain rates and temperatures. So, a material characterization is required in those conditions. The mechanical behaviour of a high-carbon steel was studied through quasi-static and dynamic tensile tests in order to determine the temperature and strain rate sensitivity of the material. This characterization is based on the innovative combination of an induction system controlled by pyrometry and a digital image acquisition system. This one is used for the determination of strains from displacement fields obtained by digital image correlation. In particular, effects of temperature on the modulus of elasticity, anisotropy and isotropic hardening were studied. Results of these tests allow us to establish an experimental database for the identification of parameters of various thermo-elasto-visco-plastic models. These are more or less complete depending on the number of parameters used to describe the material behaviour throughout the studied area. The model with the best ratio quality/cost-delay for a given application can be identified. Each of studied models has a specific domain of validity.
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Mathieu Vautrot. Étude du comportement mécanique des matériaux dans des conditions étendues de vitesses et de températures : application à l'acier C68 dans le cas d'une opération de formage incrémental. Autre. Université de Grenoble, 2012. Français. ⟨NNT : 2012GRENA039⟩. ⟨tel-00795973⟩

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