Analysis of the State of Stresses and Plastic Strains during the Necking Process in Ductile Steels

In steel, the knowledge beyond the yield strength elastic is of the utmost importance because of the large plastic strain that take place both at the time of the breakage and multiple conformation processes involving a stretch of material, such as rolling or extrusion. Beyond the manufacturing process, the trend nowadays is to the use of more ductile steels for concrete every time, that improve the behavior of structures due to loads limits such as those produced by seismic events.In this investigation, based on breakage testing tensile, we present a detailed analysis of the behavior of ductile steels, manufactured by hot rolling, defining plastic behavior of these laws to breaking, focusing primarily on the phenomenon of the formation of the neck.