Etude expérimentale et modélisation du comportement viscoplastique du titane pur à grande vitesse de déformation

Abstract : The object of this thesis is the development of a model of viscoplastic behavior for titanium-alpha, which is based on the evolution of the microstructure. In order to establish the framework of the study and to isolate the variables which we use thereafter, we start by presenting the phenomena which are generally observed at the time of the plastic deformation. The first difficulty which arises during the stablishment of behavior is the choice of the internal variables (like the density of dislocations and the presence of the twins). Those must be independant and representative of the phenomena which one wants to model. Moreover, they must be operational, i.e. that one can measure their experimental value indeed, preferably simply, if not directly. The first experimental part includes the development of a device of compression and a series of mechanical tests on titanium pure. The experimental method adopted for our tests is the direct impact. This completely original method consists of a direct impact of the projectile with flat end, propelled by a gas gun, on the test-tube. This device makes it possible to reach very high speeds of deformation (~ 5x10(4) s-1) and to choose in advance the impact speed of the projectile. The second part consists of the reformulation of a model starting from considerations on the physical mechanisms and the restitution of phenomena related to the history of the loading
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Marwan Jarkas. Etude expérimentale et modélisation du comportement viscoplastique du titane pur à grande vitesse de déformation. Autre. Université Paul Verlaine - Metz, 1999. Français. ⟨NNT : 1999METZ027S⟩. ⟨tel-01775799⟩

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