H Noori - Graduated Student School of Metallurgy and Materials Engineering.,Faculty of Engineering., University of Tehran,Tehran, Iran
R Mahmudi - Professor School of Metallurgy and Materials Engineering.,Faculty of Engineering., University of Tehran,Tehran, Iran

Forming Limit Diagrams (FLDs) are calculated based on analyses proposed by Jones and Gillis. They idealized the sheet metal deformation into three phases: (Ι) homogeneous deformation up to maximum load, (ΙΙ) deformation localization under constant load, and (ΙΙΙ) local necking with a precipitous drop in load. In the current analysis, Hill’s quadratic flow law for sheets having planar isotropy is used in conjunction with the three-stage deformation approximation. Calculated FLDs are compared with experimentally determined result for interstitial free (IF) sheet.

Forming Limit Diagram, prediction, JG analysis, Interstitial Free (IF) steel