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Tunis, Tunisia

Nasri M.T.,UR MSSDT 99 UR11 46 ESSTT | Slimani F.,UR MSSDT 99 UR11 46 ESSTT | Ayadi M.,UR MSSDT 99 UR11 46 ESSTT | Cherouat A.,UTT ICD Gamma 3 Team | And 2 more authors.
Solid State Phenomena | Year: 2013

This study presents experimental and numerical approaches to study the thermo-elasto-plastic behavior coupled to ductile damage of thin sheet. The study highlights the influence of temperature on the mechanical properties affecting the ability of forming aluminum sheet 1050A. The properties of the Swift's model hardening coupled to isotropic ductile damage variable and the Erichsen Index are obtained using inverse approach (Nelder-Mead method). The obtained results have established a correlation between the Index Erichsen formability of the material. © (2013) Trans Tech Publications, Switzerland. Source

Slimani F.,UR MSSDT 99 UR11 46 ESSTT | Cherouat A.,UTT ICD Gamma 3 Team | Ayad M.,UR MSSDT 99 UR11 46 ESSTT | Rezgu M.A.,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 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. 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. Source

Bouzaiene H.,UR MSSDT 99 UR11 46 ESSTT | Ayadi M.,UR MSSDT 99 UR11 46 ESSTT | Zghal A.,UR MSSDT 99 UR11 46 ESSTT
Lecture Notes in Mechanical Engineering | Year: 2013

Friction stir welding (FSW) is a relatively new joining technique particularly for aluminium alloys that are difficult to fusion weld. The most common applications are aircraft structures where the cost and weight can be reduced by using new joining techniques instead of riveting. The paper has investigated the effect of cooling on the distribution of residual stresses in friction stir welding of AA2017 aluminium alloy. An attempt has been made to examines the possibility to modify the residual stress state in the joint by applying cooling fluid during FSW processes. The results show that the magnitude of the tensile stress can be reduced significantly in the weld region and we can produce compressive stresses which can be beneficial e.g. for reducing crack propagation speed. © Springer-Verlag Berlin Heidelberg 2013. Source

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