Consider a sheet of metal of 125 mm width and 2 mm thickness. it is to be rolled into a thickness of 1.25 mm in one pass using a mill whose steel rolls are of 200 mm diameter. The value of Mu in this case is about 0.1, and the average plane strain flow stress of the metal sheet is 130 MPa. Plane strain modulus for steel rolls to be E' = (E)/(1-v^2) = 225 GPa.

a) Calculate the average roll pressure if roll flattening is ignored.

b) Repeat (a) if roll flattening is considered.

c) Estimate the minimum thickness to which this sheet could be rolled.