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Amdouni H.,British Petroleum | Bouzaiene H.,Research Unit in Solid Mechanics | Montagne A.,Arts et Metiers ParisTech | Nasri M.,British Petroleum | Iost A.,Arts et Metiers ParisTech
International Journal of Advanced Manufacturing Technology | Year: 2016

In this work, a new ball-burnishing strategy, in two crossed passes, was applied on the flat machined surface of 2017A-T451 aluminum alloy to investigate the influence of three classical ball-burnishing factors (burnishing speed Vb in mm/min, depth of penetration ab in μm and lateral feed f in mm) on the treated surface integrity enhancement. Experimental work is based on the application of an experimental face-centered composite design (CCD) formed by three factors at three levels. The mathematical modeling of the average roughness Ra, of the mean spacing of roughness profile irregularities Sm and of the surface hardness HIT of the treated surfaces was performed by the response surface methodology (RSM). Best ball-burnished surface integrity has been established by the application of optimal ball-burnishing studied factors (Vb = 500 mm/min, ab = 40 µm, and f = 0.2 mm). High surface quality is then characterized by a gain in average roughness Ra of 81 %, an enhancement in the mean spacing of profile irregularities Sm of 34 % and an improvement in surface nano-hardness HIT of 17 % when compared to the machined surface. Machined and ball-burnished optimized surface characterization confirms surface finishing process power and contribution to surface integrity enhancement of treated flat surface. © 2016 Springer-Verlag London

Bouzaiene H.,Research Unit in Solid Mechanics | Rezgui M.-A.,Research Unit in Solid Mechanics | Ayadi M.,Research Unit in Solid Mechanics | Zghal A.,Research Unit in Solid Mechanics
Transactions of Nonferrous Metals Society of China (English Edition) | Year: 2012

An experimental study was undertaken to express the hardening Swift law according to friction stir welding (FSW) aluminum alloy 2017. Tensile tests of welded joints were run in accordance with face centered composite design. Two types of identified models based on least square method and response surface method were used to assess the contribution of FSW independent factors on the hardening parameters. These models were introduced into finite-element code "Abaqus" to simulate tensile tests of welded joints. The relative average deviation criterion, between the experimental data and the numerical simulations of tension-elongation of tensile tests, shows good agreement between the experimental results and the predicted hardening models. These results can be used to perform multi-criteria optimization for carrying out specific welds or conducting numerical simulation of plastic deformation of forming process of FSW parts such as hydroforming, bending and forging. © 2012 The Nonferrous Metals Society of China.

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