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Analysis of deep drawing process by using hypo-and hyperelastic based plasticity models

Canbakan, İlke Barış
Estimation of formability is important for sheet metal forming in order to get desired results with minimum amount of experiments. This can be achieved by having a proper constitutive model for the material that can estimate the behavior accurately. In the context of this thesis, two inherently different type of constitutive models, namely hypoelastic and hyperelastic based plasticity models are compared. For both formulations, three different stress-strain relations were created having non-linear isotropic hardening, non-linear kinematic hardening and a combined non-linear isotropic and kinematic hardening adding up to total of six material models. Von Mises Yield criterion was utilized in all six of these models and they were implemented to a commercial finite element program as user material subroutine. Comparison is made by three different deep drawing simulations which are cylindrical, square and round bottom cup drawings.