Calculate and plot the springback factor in bending 1-mm thick sheet metal as a function of radii from 0.25 to 250 mm for (a) 303 stainless steel; (b) 1100-0 aluminum; (c) HK31A magnesium; (d) Ti-6Al-4V. Your plot must be computer-generated using Excel, Matlab, etc. Clearly state the values of yield stress and elastic moduli of the four materials, and state where you found these values. (15 points)