LMSSDT

Hussein, Tunisia
Hussein, Tunisia
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Mahfoudh A.,LMSSDT | Cherouat A.,University of Technology of Troyes | El Hami A.,INSA Rouen | Radi B.,FST Settat
Advanced Materials Research | Year: 2012

This paper presents an experimental/numerical methodology which aims to improve 3D welded tube considering their anisotropic effect, geometrical singularities found in the welded joint, and heat affected zone behaviour by hydroforming process. This process contributes to reduce the number of welding and assembly operations needed to generate complex structures, while improving the weight saving and quality of finished parts. In spite of the advances in the performance of this manufacturing technology, some problems are linked to particularities of certain raw materials and additional studies must be developed, like in the case of welded tubes. The experimental study is dedicated to the identification of stress-strain flow of the base metal and the heat-affected zone from the global measure of tube displacement, thickness evolution and internal pressure expansion. Nanoindentation test is adapted to investigate the heat affected zone mechanical behaviour. Workpiece behaviour's models used to simulate the expansion tests, made it possible to highlight the combined effects of the inhomogeneous behaviour of basic material and heat affected zone, as well as the geometrical singularities found in the welded tubes. From the simulations carried out, it is clear the influence of the plastic flow behaviour of the welded tube in the final results (thickness distribution, stress instability, tube circularity, critical thinning and rupture). © (2012) Trans Tech Publications, Switzerland.


Radi B.,FST Settat | Ayadi A.,LMSSDT | Cherouat A.,University of Technology of Troyes | Moreau L.,University of Technology of Troyes | El Hami A.,INSA Rouen
Key Engineering Materials | Year: 2011

In this study, we present an experimental/numerical methodology which aims to improve 3D thin sheet hydroforming. The experimental study is dedicated to the identification of stress-strain flow by using the Nelder-Mead simplex algorithm optimization from the global measure of displacement and force. Applications are made to the simulation of thin sheet hydroforming using different die geometry to show the efficiency of the proposed methodology to localize plastic instability, thinning of the blanks and damage initiation under different forming condition. © (2011) Trans Tech Publications.


Ayadi A.,LMSSDT | Radi B.,British Petroleum | Cherouat A.,GAMMA3 | Hami A.E.,INSA Rouen
Applied Mechanics and Materials | Year: 2011

In this study, we present an experimental/numerical methodology which aims to improve3D thin sheet hydroforming. The experimental study is dedicated to the identification ofstressstrain flow by using the Nelder-Mead simplex algorithm optimization from the globalmeasure of displacement and force. Applications are made to the simulation of thin sheet hydroforming using different die geometry to show the efficiency of the proposed methodology to localize plastic instability, thinning of the blanks and damage initiation under different forming condition. © (2011) Trans Tech Publications, Switzerland.


Ayadi A.,LMSSDT | Cherouat A.,University of Technology of Troyes | Cherouat F.,LMSSDT | Rezgui M.A.,LMSSDT | Zghal A.,LMSSDT
Applied Mechanics and Materials | Year: 2011

Coupled constitutive equations, formulated in the framework of the thermodynamics of irreversible processes accounting for isotropic hardening as well as the isotropic ductile damage are used to simulate numerically, by the Finite Element Analysis, 3D metal hydroforming processes. The experimental study is dedicated to the identification of stress-strain flow and damage parameters by using the Nelder-Mead simplex algorithm optimization from the global measure of displacement and force. Applications are made to the simulation of thin sheet thermohydroforming using different die geometry to show the efficiency of the proposed methodology and to localize plastic instability, thinning of sheet and damage initiation under different forming conditions. © (2011) Trans Tech Publications, Switzerland.


Slimani F.,LMSSDT | Cherouat A.,University of Technology of Troyes | Ayadi A.,LMSSDT | Rezgui M.A.,LMSSDT | Zghal A.,LMSSDT
Solid State Phenomena | Year: 2013

Coupled constitutive equations, formulated in the framework of the thermodynamics of irreversible processes accounting for isotropic hardening as well as the isotropic ductile damage are used to simulate numerically, by the Finite Element Analysis, 3D metal hydroforming processes. The experimental study is dedicated to the identification of stress-strain flow and damage parameters by using the Nelder-Mead simplex algorithm optimization from the global measure of displacement and force. Applications are made to the simulation of thin sheet hydroforming using different at different temperature to show the efficiency of the proposed methodology and to localize plastic instability, thinning of sheet and damage initiation under complex forming conditions. © (2013) Trans Tech Publications, Switzerland.

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