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Publication Index: ScopusSubject: Sheet metal forming

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    Article
    Citation - WoS: 13
    Citation - Scopus: 13
    Analysis of Non-Isothermal Warm Deep Drawing of Dual-Phase Dp600 Steel
    (Springer France, 2019) Pepelnjak, T.; Kayhan, E.; Kaftanoglu, B.
    Improving the formability of the material is a key 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 a loss of their mechanical properties. To improve the drawing ratio, only the heating of the flange region in the warm temperature range up to 573K was studied on DP600 sheet steel by numerical simulation. A thermo-elastic-plastic finite element method (FEM) analysis of deep drawing at several drawing ratios was performed and compared with experimental results. During the experiments, the flange area of the blank was heated by induction heating, and the central part over the punch was cooled with spray water. Experimental results showed that limiting drawing ratio could be increased by 25.58%. The microstructure of the DP 600 steel was analyzed before and after the warm forming process. No significant changes were observed, and the high strength properties of the DP 600 steel remained intact. There was good agreement between numerical and experimental results.
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    Conference Object
    Prediction of plastic instability and forming limits in sheet metal forming
    (2011) Şanay,B.; Kaftanoglu,B.
    In this study, FLD's are predicted by simulating Nakazima test using a finite element software. Strain propagation instability criterion is used to evaluate the limit strains from the finite element simulations. SAE 1006, material is used in this study and 7 different specimen geometries are analyzed. Furthermore, FLD's are also predicted by theoretical approaches namely; Keeler's model, maximum load instability criterion, Swift-Hill model and Storen-Rice model. At the end of the study, the calculated FLD's are compared with the experimental results. © 2011 IBF (RWTH Aachen) & IUL (TU Dortmund).