Contribution à l'étude de l'aptitude au formage d'alliages de symétrie hexagonale

Abstract : For deep drawing of thin sheets, the stress state has to be in such a way that the deformation is permanent, and the defromation state has to remain below the necking or the fracture. The yield loci (YL) and the forming limit diagrams (FLD) define the two limit states in wich the material stays during deep drawing. The calculation of yield loci is carried out using a Taylor model of plastic deformation together with the orientation distribution function (ODF) wich represents the crystallographic texture. The definition of yield loci in the case of hexagonal symmetry alloys has been applied to two titanium alloys, one zirconium alloy and one zinc alloy. The results of the modelling has been compared to the experimental values in the case of the variation of the yield stress and of the plastic strain ratio in the sheet plane. The prediction and the measurement of the texture evolution during cold rolling has been compared, and the effect of the latent hardening has been pointed out. The results obtained with a static model, are in agreement with those obtained with a Taylor model. In order to verify that the critical resolved shear stresses are indenpendent of the model, we have to use other models (i.e. self-consistent). The experimentalFLD were plotted for four alloys. The FLD calculations were carried out using the Marciniak, Kuczynski approach in wich the yield loci were used as plastic criterion. The theorical and the experimental results were compared
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Jean-Jacques Fundenberger. Contribution à l'étude de l'aptitude au formage d'alliages de symétrie hexagonale. Autre. Université Paul Verlaine - Metz, 1992. Français. ⟨NNT : 1992METZ039S⟩. ⟨tel-01776005⟩

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