If you are talking about permanently forming the rod into the bent form, you will need some information about the yield point for the material. Permanent forming involves large deformation, so you will need to determine the amount of strain you wish to create in the rod, and then see where that puts you on the stress--strain diagram. The required force will be that which develops the force for this stress, but you must allow for some amount of spring back. This is essentially a manufacturing engineering problem, one that cannot be entirely calculated but only estimated.
If you apply equal and opposite moments (and no shear forces) at the ends of the rod, the bending moment will be constant along the length and the deformed shape will be (exactly) an arc of a circle. You can find the curvature from beam bending theory.
