Material and Damage Characterization of the Elastoplastic Response of the EK4 Deep Drawing Steel

Although EK4 drawing steel is nowadays widely used to manufacture a great variety of parts, it exhibits marked normal and planar anisotropy that can make difficult control the process during its forming. In order achieve an accurate description elastoplastic material response in sheet forming operations, this work presents detailed damage characterization deep through two-step methodology involving both experiments finite element simulations. Firstly, tensile tests on samples cut along rolling, diagonal transverse directions were carried out. The corresponding measurements calibrate parameters related following modeling approaches adopted present study: Hollomon hardening law, non-associated Hill-48 phenomenological constitutive model anisotropic Hosford-Coulomb ductile fracture criterion. Secondly, was assessed validated numerical simulation technological Erichsen test which mainly subjected biaxial stress state. obtained predictions show good agreement when compared with experimental punch load–displacement curve thickness radial profile at final stage sample.