Granična deformabilnost nerđajućih tankih limova u uslovima nemonotonog procesa deformisanja

Abstract

Presented in the paper is experimental investigation of forming limit of thin sheet made from Č.4580 ( X5CrNi18 9, after DIN ). The specific two-phase non-monotonous procedure is applied. In the first phase the axial tension of 120 mm wide sheet stripe is applied, while in the second phase, the series of stretching by semi-spherical punch is performed. Forming limit diagram is formed and compared with forming limit diagram related to monotonous forming. Also, strain distribution and analysis of applied strain procedure effects is given.