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Modélisation de lignes d'écoulement en extrusion angulaire à section constante et non-constante

Abstract : Two new flow line models were proposed; a new ?fan-model? (FM) and a generalized ?power-law model? (PLM). The FM is tested on experimentally obtained flow lines in Al ECAE processed through a 90° and a120° die. The PLM is compared also with the flow fields obtained from finite element simulations. For the PLM, the effects of its parameters on the maximum strain rate and von Mises equivalent strain are analysed. The experimental flow lines in ECAE deformed Al are analyzed with regard to these parameters and their variation within the 90° and 120° dies is discussed. Using the PLM, the effect of the back pressure on the deformation field in a 90° ECAE die for an aluminium alloy 6061 is analysed. Application of these two models in texture simulation is presented. The effects of each parameter of PLM on texture development in 90° and 135° ECAE die have been simulated. The comparison of simulated textures with those from experiment for Cu and Al obtained from 135° ECAE tests was presented and the differences between them were discussed. The texture simulations for Cu ECAE processed through a 90° die using the fan-type flow line model is done with a very good agreement with experiment. The non-equal channel angular extrusion (NECAE) as a new SPD process is also presented. Material element shape change during this process within a 90° die is studied and a new flow line function is presented and validated using finite element simulations. Furthermore, texture development in NECAE is simulated and compared with the textures of the ECAE process
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Arman Hasani. Modélisation de lignes d'écoulement en extrusion angulaire à section constante et non-constante. Autre. Université Paul Verlaine - Metz, 2009. Français. ⟨NNT : 2009METZ012S⟩. ⟨tel-01752626⟩



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