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    Assessment of Conical Die Deep Drawability of DP800 and MART1400 Advanced High Strength Steels
    (Society of Automotive Engineers Turkey, 2023) Şen, N.; Civek, T.; Tongü, E.
    Deep drawing is one of the most important and vastly conducted sheet metal forming method. Thus, even small improvements achieved on the deep drawability of sheet metals significantly increases the ability of sheet metal to be formed into more complex products. Advanced high strength steels (AHSSs) are one of the most popular steels in the automotive industry due to their high strengths. However, their low ductility causes considerable splitting problems near the cup punch region. In this study, deep drawing experiments have been conducted in conical dies with four different angles (0°, 7.5°, 12.5°, and 20°) for DP800 and MART 1400 steels to observe whether a higher deep drawing ratio (DDR) can be achieved by deep drawing in conical dies for AHSSs. In addition, finite element analysis (FEA) has been utilized to estimate the DDR for each types of steels in different conical die setups. It has been observed that the deep drawability of MART1400 steel has not improved in any of the conical die setups. However, DDR of DP800 has slightly increased by 2.46% by deep drawing with 20° die angle. A good agreement with the numerical and experimental results has been achieved. © 2023 Universidade do Vale do Rio dos Sinos. All rights reserved.
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    Finite Element Analysis of AA6061/AA5754 Bimetallic Sheets by Constrained Groove Pressing
    (CRC Press, 2024) Taşdemir, V.; Seçgin, Ö.; Şen, N.
    Constrained groove pressing (CGP) is a severe plastic deformation method used for obtaining ultrafine-grained structures in sheet materials and alloys and for improving their mechanical properties. This study entailed a finite element analysis (FEA) of the CGP process with AA6061/AA5754 bimetallic sheets. The FEA was performed using 30°, 45°, and 60° groove angles; friction coefficients of 0.05, 0.1, and 0.2; and two types of contacts (free and fixed). The thicknesses of the AA6061 and AA5754 sheet materials used in the analysis were 0.8 mm and 1.2 mm, respectively. The analysis showed that the type of contact between the materials is very important and that the effective plastic strain increases as the channel angle increases. © 2024 selection and editorial matter, Amrut Mulay, Swadesh Singh and Andrzej Kocanda.