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Etudes expérimentales et modélisation de la déformation plastique d'un fer, grandes déformations, sensibilité à la vitesse et histoire de chargement

Abstract : This work describes the behavior of a cubical system metal centered : the iron 0.02% C with the help many experimental results. The first part of this thesis is devoted to a bibliographical study whose which the sensitivity of the behavior of metals CC to the speed of deformation, to the temperature is put in obviousness, the indication of the possibility of the appearance of the mecanical twining for the great speeds of deformation, the existence for metals CC of them limit inferior elasticity and superior and then element of the theory of dislocation. The second part presents used experimental techniques and relationships of result deprivation. The third part is devoted to the representation of results and their analysis. Several observation experimental in this thesis : them limit elasticity that increases with the speed of deformation, differences of sensitivity to the speed according to the type of loading and the effect of the aging on the peaks of elasticity. Finally, the introduction of a model based on the activation thermal that fact introduce notions of the effective and internal stress governing the plastic flow whose evolution is linked to energy of activation
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Mostapha Afane. Etudes expérimentales et modélisation de la déformation plastique d'un fer, grandes déformations, sensibilité à la vitesse et histoire de chargement. Autre. Université Paul Verlaine - Metz, 1997. Français. ⟨NNT : 1997METZ044S⟩. ⟨tel-01777225⟩

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