Uticaj promenljivih tribo-uslova na položaj krive granične deformabilnosti tankih limova pri nemonotonom deformisanju

Abstract

Here we present experimental results of influence of tribo-conditions on position of forming limit curve (FLC) in non monotonous forming, and proposal of simple theoretical way to define position of FLC depending on contact conditions. Two two-phase non mononotonous procedures has been realized by experiment. In the first procedure, in the first phase we perform uniaxial tension of sheet metal stripe 200 mm wide, while in the second phase we determine FLC. In second procedure,in the first phase we perform biaxial tension, while in the second phase we determine FLC as in former procedure.