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Conference Object Citation - WoS: 3Citation - Scopus: 3On the Fracture Prediction of 304l Stainless Steel Sheets Utilizing Different Hardening Models(Iop Publishing Ltd, 2016) Dizaji, S. A.; Darendeliler, H.; Kaftanoglu, B.Fracture prediction is one of the challenging problems in sheet metals. Forming limit curves at fracture (FLCF), as a tool to determine fracture in sheet metal processes, are obtained through the use of numerical analyses. As one of the approaches, the ductile fracture criteria (DFCs) represent the fracture initiation of the sheets formed by different loading histories. In this study, the effects of three different hardening models on different DFCs to predict the fracture for stainless steel 304L have been investigated. The results show that most of DFCs work better in the region. epsilon(2)< 0 especially with the kinematic hardening model. However, for the region. epsilon(2)> 0 where the stretching conditions are dominant, none of them could precisely estimate the fracture initiation.Conference Object Citation - WoS: 1Citation - Scopus: 1Finite Element Analysis of Non-Isothermal Warm Deep Drawing of Dual Phase Steel(E D P Sciences, 2016) Pepelnjak, T.; Kaftanoglu, B.Improving the formability of the material is an important issue in the deep drawing process. Heating the material above its recrystallization temperature drastically increases formability but in the case of dual phase (DP) steels it results in the loss of their mechanical properties. To improve the drawing ratio, only the heating of the flange region in the warm temperature range up to 300 degrees C was studied on DP600 sheet steel by numerical simulation. Thermo-elastic-plastic FEM analysis of deep drawing at several drawing ratios was performed and compared with experimental results.
