Прегледај по Аутор "Ficko, Mirko"

Сада се приказује 1 - 1 од 1
  • Сличица
    Ставка
    MATERIAL FORMABILITY AT BULK METAL FORMING, CRITERIA, METHOD OF DETERMINATION AND APPLICATION
    (UNIVERRSITY POLITEHNICA TIMISOARA, FACULTY OF ENGINEERING HUNEDOARA, 2019) Vilotić, Dragiša; Kraišnik, Milija; Milutinović, Mladomir; Movrin, Dejan; Vilotić, Marko; Anić, Jelica; Ficko, Mirko
    Material formability it is material ability to deform permanently in different stress condition without structure damage. The fracture limit of material in bulk metal forming is based on fracture and formability criteria. In metal forming, two formability criteria and two workability diagrams are being used: a) the strain based and b) stress based formability diagram. Strain based formability diagram represents the dependence of the principal strains on the free surface of specimen at the moment of the fracture occurrence. The stress based formability diagram represents the relation between limit strain and stress triaxiality ratio in the zone of fracture. In this paper, methodology of formability diagrams determination is presented and application of formability diagram for the limit strain prediction in multi-stage upsetting of prismatic specimen by V-shape dies is performed.