is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. Abstract 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 V b in mm/min, depth of penetration a b 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 ballburnishing studied factors (V b = 500 mm/min, a b = 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 ballburnished optimized surface characterization confirms surface finishing process power and contribution to surface integrity enhancement of treated flat surface.
Friction Stir Welding (FSW) processes have been applied in numerous industrial fields and broadly embraced by the research community. In this paper, given three FSW process parameters, namely, the tool rotation speed N(rpm), the tool traverse feed F(mm/min) and the tool pin/shoulder diameters ratio (r%), we purpose to ascertain their impact on joints Ultimate Tensile Stress (UTS) and joints Yield Stress (YS). The FSW has been executed using 6mm thick rolled plate in 2017AA. For the design of experiments strategy, we conducted a face centered central composite strategy through which 18 trials have been executed. Then, we utilized the RSM technique to formulate the predictive models which are relevant to the (UTS) and (YS) outputs. Accordingly, the study has pointed out the prevalence of the tool rotation speed and the tool diameters ratio factors; however, the tool traverse feed (F) was found trivial and statistically insignificant. Likewise, the sensitivity analysis regarding factors N, F and r% on both (UTS) and (YS) has exhibited the dominance of the tool diameters ratio (r%), indistinctively.
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