Influence of the coupling between the mechanical characteristics and the welding conditions by the FSSW process: case of the bi-material aluminum-steel

The present study investigates the effect of joining parameters on the mechanical characteristics of dissimilar friction stir spot welding (FSSW) between aluminum alloys and galvanized steel. Mechanical performance has been evaluated by shear and microhardness testing. A macrostructural examination has revealed the creation of mechanical interlocking in the Al steel connections. Shear failure load has increased with increasing both tool rotational speed and plunge depth for all FSSW connections. Higher plunge depth has improved the mechanical interlocking between lower and upper sheet due to the formation of hoo

An experimental study of loading parameters effect on fatigue crack closure in 12NC6 steel

International audienceIn this paper, the fatigue crack closure (FCC) phenomenon was experimentally revealed using the back face strain gauges technique. The effects of the loading parameters on FCC have been investigated on 12NC6 heat treated steel. Four yield stresses values have been tested. The loading conditions were chosen to have the stress intensity factor range ΔK between 17 and 30 MPaView the MathML sourcem with four load ratio values: 0.05-0.1-0.3 and 0.5. In this study, the closure stress intensity factor Kcl is approximately constant for all load ratio values (R). The expression describing the evolution of the closure parameter U is obtained as a function of both the R and Kmax

Effects of Welding Parameters on FSSW: Experimental and Numerical Study

In this paper, the Aluminum A6060-T5 plates of thickness 2 mm was friction stir spot welded (FSSW), and the effects of welding parameters (rotation speed, plunge speed and distance from the center of pin) on the temperature variation of the joints were investigated. The experimental design method is used to investigate the effects of welding parameters in order to achieve an optimization of the FSSW process. This optimization allows the development of experimental results and may help to better understand the complexity of the phenomena resulting from contact parts/tool during the stirring process

Experimentation and Prediction of the Wear of a Cutting Tool in Turning Process

In the present work, the performance of multilayer coated carbide tool was investigated considering the effect of cutting parameters during turning of 34CrMo4 Low alloy steel. It has high strength and creep strength, and good impact tenacity at low temperature. It can work at –110°C to 500°C. And EN 10083-1 34CrMo4 owns high static strength, impact tenacity, fatigue resistance, and hardenability; without overheating tendencies. The objective functions were selected in relation to the parameters of the cutting process: surface roughness criteria. The correlations between the cutting parameters and performance measures, like surface roughness, were established by multiple linear regression models. Highly significant parameters were determined by performing an Analysis of variance (ANOVA). During the experiments flank wear, cutting force and surface roughness value were measured throughout the tool life. The results have been compared with dry and wet-cooled turning. Analysis of variance factors of design and their interactions were studied for their significance. Finally, a model using multiple regression analysis between cutting speed, fee rate and depth of cut with the tool life was established

Développement du typage moléculaire de Bartonella henselae par la technique MLVA (Multi Locus VNTR Analysis) et applications épidémiologiques Paper presented at: Journées d’animation scientifiques du département Santé Animale de l’INRA

National audienc

Développement du typage moléculaire de Bartonella henselae par la technique MLVA (Multi Locus VNTR Analysis) et applications épidémiologiques Paper presented at: Journées d’animation scientifiques du département Santé Animale de l’INRA

National audienc