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3. A bending operation is to be performed on a cold-rolled steel with 5.00 mm thickness. The part is drawn in the figure below. The steel has a UTS = 420 MPa. Determine: (a) Blank size required; (b) Bending force if the bend is performed in a V-die with a die opening dimension = 40 mm; (c) If the steel has tensile reduction percentage of area r = 13(%) when failure happens, and the minimum bending radius given by experiment fitting is min R/t = 60/r - 1, whether this bending can be performed; (d) If the designed bend radius is enlarged to 20 mm, and the other configurations are the same as the ones in the figure below, what the bend angle will be after springback. The steel has yield strength = 350 MPa and Young's modulus = 200 GPa.

          3. A bending operation is to be performed on a cold-rolled steel with 5.00 mm thickness. The part is drawn in the figure below. The steel has a UTS = 420 MPa. Determine:
(a) Blank size required;
(b) Bending force if the bend is performed in a V-die with a die opening dimension = 40 mm;
(c) If the steel has tensile reduction percentage of area r = 13(%) when failure happens, and the minimum bending radius given by experiment fitting is min R/t = 60/r - 1, whether this bending can be performed;
(d) If the designed bend radius is enlarged to 20 mm, and the other configurations are the same as the ones in the figure below, what the bend angle will be after springback. The steel has yield strength = 350 MPa and Young's modulus = 200 GPa.

3. A bending operation is to be performed on a cold-rolled steel with 5.00 mm thickness. The part is drawn in the figure below. The steel has a UTS = 420 MPa. Determine:
(a) Blank size required;
(b) Bending force if the bend is performed in a V-die with a die opening dimension = 40 mm;
(c) If the steel has tensile reduction percentage of area r = 13(%) when failure happens, and the minimum bending radius given by experiment fitting is min R/t = 60/r - 1, whether this bending can be performed;
(d) If the designed bend radius is enlarged to 20 mm, and the other configurations are the same as the ones in the figure below, what the bend angle will be after springback. The steel has yield strength = 350 MPa and Young's modulus = 200 GPa.

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