A cup-shaped part is to be drawn without a blank holder from sheet metal whose thickness = 0.25 in. The inside diameter of the cup = 2.5 in, its height = 1.5 in, and the corner radius at the base = 0.375 in.
(a) What is the minimum starting blank diameter that can be used, according to Eq?
(b) Does this blank diameter provide sufficient material to complete the cup?