1 UR MSSDT 99 UR11 46 ESSTT

Tunis, Tunisia

1 UR MSSDT 99 UR11 46 ESSTT

Tunis, Tunisia

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Nasri M.T.,1 UR MSSDT 99 UR11 46 ESSTT | Slimani F.,1 UR MSSDT 99 UR11 46 ESSTT | Ayadi M.,1 UR MSSDT 99 UR11 46 ESSTT | Cherouat A.,2 UTT ICD Gamma 3 Team | And 2 more authors.
Advanced Materials Research | Year: 2012

The studies on the development and profitability of forming processes of thin structures, plastic deformation, continue to grow. Their goals are the prediction and assessment of default risks incurred by parts manufacturing phase. The quality of numerical predictions depends on the accuracy and reliability of the models selected. This justifies the development of different techniques for the identification of skills forming sheets and tubes. This study fits within this frame work, a method of identifying the coefficients characterizing the elastoplastic damage behavior of sheet metal based on the analysis of variance (ANOVA) was developed. Performance evaluation of the ANOVA analysis has been conducted through a confrontation of results with those identified by the inverse method. © (2012) Trans Tech Publications, Switzerland.


Slimani F.,1 UR MSSDT 99 UR11 46 ESSTT | Cherouat A.,2 UTT ICD Gamma 3 Team | Ayadi M.,1 UR MSSDT 99 UR11 46 ESSTT | Rezgui M.A.,1 UR MSSDT 99 UR11 46 ESSTT
Advanced Materials Research | Year: 2012

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. © (2012) Trans Tech Publications, Switzerland.

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