Caractérisation expérimentale et modélisation du comportement plastique d'aciers à transformation martensitique : applications à la mise en forme

Abstract : The industrialists of the sector of the stamping of sheets seek materials increasingly more powerful, presenting a good compromise between the aptitude and the mechanical resistance of sheet formatted. Steels for purpose TRlP (TRansformation lnduced Plasticity) answer these requirements well. Two modelings phenomenologic and semi-physics of these steels are proposed and implemented in the code of finite elements Abaqus through various models of work hardening and martensitic kinetics of transformation. An experimental characterization is also carried out on the austenitic steels stainless of type 304 and multiphase TRIP800, in particular for monotonous ways of loading at various temperatures like in stamping of the Marciniqk type. A numerical study of the formability of sheets of these unstable steels is then presented for the'two models describing the various contributions of the martensitic transformation. These contributions are analyzed in order to evaluate their influence on stamping. A confrontation between the experimental and numerical results indicates a good correlation. A better capacity of prediction is then obtained for the more physical model taking account of the micromechanical phenomena.
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Jérôme Serri. Caractérisation expérimentale et modélisation du comportement plastique d'aciers à transformation martensitique : applications à la mise en forme. Autre. Université Paul Verlaine - Metz, 2006. Français. ⟨NNT : 2006METZ025S⟩. ⟨tel-01752446⟩

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