Strain Hardening Law Coupled to Damage and Remeshing Procedure Application to Sheet Hydroforming Processes

Abstract:

In this study, we present an experimental/numerical methodology which aims to improve 3D thin sheet hydroforming considering coupled constitutive equations formulated in the framework of irreversible processes accounting for isotropic hardening as well as isotropic ductile damage. The experimental study is dedicated to the identification of stress-strain flow from the global measure of pole displacement, thickness evolution and internal pressure expansion. Indeed, Hill48 yield surface anisotropy parameters and coefficients of the Swift law coupled to ductile damage allowing to locate plastic instability zones of hydroformed sheets are identified with three dies cavities shapes. Or during the hydroforming processes severe mesh distortion of element occur after a few incremental steps. Hence an automatic mesh generation with remeshing capabilities is essential to carry out the FEA. The proposed technique based on geometrical criteria includes adaptive refinement and coarsening procedure is integrated in a computational environment.

• Periodical: Advanced Materials Research (Volume 423)
• Pages: 187-199
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.423.187
• Online since: December 2011
• Authors: Slimani Faouzi, Abel Cherouat, A. Ayadi, Mohammed Ali Rezgui
• Keywords: Experimental Test, Finite Element Method (FEM), Plastic Instability, Remeshing, Sheet Hydro-Forming

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