(20 pts) 2. A bending operation is to be performed on a cold-rolled steel with 5...

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(20 pts) 2. A bending operation is to be performed on a cold-rolled steel with 5 mm thickness. The part is drawn in the figure below. The steel has a UTS = 350 MPa, yield strength = 250 MPa and Young's modulus = 200 GPa. Determine: (a) Blank size required; (b) Bending force if the bend is performed in a V-die with a die opening dimension = 45 mm; R 60 - t r (c) If the steel has tensile reduction percentage of area r = 10 (%) when failure happens, and the minimum bending radius given by experiment fitting is min 1, whether this bending can be performed; (d) What the minimum designed bending radius is if the other configurations are the same as the ones in the figure below, and what the bending angle will be after springback under this scenario. 35 t=5.00 58 40 R = 8.5 46.5 (20 pts) 2. A bending operation is to be performed on a cold-rolled steel with 5 mm thickness. The part is drawn in the figure below. The steel has a UTS = 350 MPa, yield strength = 250 MPa and Young's modulus = 200 GPa. Determine: (a) Blank size required; (b) Bending force if the bend is performed in a V-die with a die opening dimension = 45 mm; R 60 - t r (c) If the steel has tensile reduction percentage of area r = 10 (%) when failure happens, and the minimum bending radius given by experiment fitting is min 1, whether this bending can be performed; (d) What the minimum designed bending radius is if the other configurations are the same as the ones in the figure below, and what the bending angle will be after springback under this scenario. 35 t=5.00 58 40 R = 8.5 46.5