Abstract
In this paper, sheet metal forming processes are simulated with a solid-shell finite element entirely based on the enhanced assumed strain (EAS) method. The solid-shell formulation involves a minimum set of enhancing variables, resulting in a competitive approach when compared with other fully integrated hexahedral solid-shell elements in the literature. The adopted EAS methodology is designed for the treatment of both transverse shear and volumetric locking. These numerical pathologies are prone to appear in the simulation of nearly incompressible, thin-shell structures when using displacement-based formulations. Examples consisting in demanding sheet metal forming tests, including large deformation anisotropic and isotropic plasticity with friction, are presented. It is still common to find, in finite element commercial codes, simulation of forming processes being carried out with membrane and shell finite elements following explicit procedures. Nevertheless, and following a distinct approach, the present solid-shell formulation, when implemented within a fully implicit numerical framework, is shown to successfully provide reliable numerical solutions compared to experimental results.
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