Caractérisation expérimentale et modélisation du comportement du cuivre en grandes déformations : sensibilité à la vitesse

Abstract : The subject of the thesis was to analyse the rate sensitivity of polycrystalline copper at large strains, order of 300 % in shear. This subject has not been so far explored and literature sources are extremely limited. On the other hand there is a great interest in including the rate effects in constitutive modelling. The torsional Hopkinson Bar (Kolsky apparatus) has been used to study the rate affects at high strain rates. At lower strain rates in shear than 300 s-1, a fast torsion machine was also employed. New computer programs developed in this purpose permitted for complete analyses of the shear stress vs. shear strain curves at different strain rates. Tests with changes of strain rate have also been performed and the results studied within the framework of constituve modelling based on evolution of the mean dislocation densites. In general, application of the constitutive formalism based on evolution of microstructure and thermal activation (rate sensitivity of strain hardening and instantaneous rate sensibility) gave good results in modelling and comparison with experimental data
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Mohammed Zenasni. Caractérisation expérimentale et modélisation du comportement du cuivre en grandes déformations : sensibilité à la vitesse. Autre. Université Paul Verlaine - Metz, 1992. Français. ⟨NNT : 1997METZ034S⟩. ⟨tel-01775999⟩

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