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    Effects of fine blanking process on cutting surfaces of high-strength DP600 and DP800 sheets
    (Taylor & Francis Ltd, 2021) Sen, Nuri; Helimergin, Fatih; Tasdemir, Vedat
    In this study, both blanking and fine blanking processes were performed using 1mm thick DP600 and DP800 sheet materials. The cutting surfaces of the materials were examined using scanning electron microscopy (SEM). The SEM examinations showed that the extent of the fracture zone in the blanking method was much greater than in the fine blanking method, whereas the extent of the shear zone in the fine blanking method was much greater than in the blanking method. In addition, in the fine blanking experiment, it was observed that the crescent and star pieces were nearly all sheared and detached from the test material, whereas with the blanking method, the crescent and star pieces were broken off from the test material. In the blanking, more than half of the cutting surface (0.6t) formed a fracture zone, while in the fine blanking no fracture zone and a shear zone of 0.9t was seen.
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    Experimental and numerical investigation of the springback behaviour of CP800 sheet after the V-bending process
    (Taylor & Francis Ltd, 2021) Sen, Nuri; Tasdemir, Vedat
    Springback plays a key role in the geometrical and dimensional integrity of the product obtained in metal forming. This study investigated the formability of high-strength complex phase CP800 sheet under V-bending at room temperature. The experiments were carried out on 2.5-mm-thick material using parameters of four different bending angles, three different punch radii and two different holding times. The effects of selected parameters on springback were investigated both experimentally and via finite element analysis (FEA). As a result of the study, it was determined that the amount of springback decreased as the die angle (alpha) increased and increased as the punch radius (r) increased, and that the effect of the holding time remained limited. In addition, the damage was observed in the bending samples obtained under experimental conditions of alpha = 60 degrees and r = 2 mm. The experimental and simulation findings showed that the measured angles (beta) were in good agreement (>95%).