Two previously undeformed cylindrical specimens of brass are to be strain hardened by reducing their cross-sectional areas (while maintaining their circular cross sections). For one specimen, the initial and deformed radii are 17 and 12 mm, respectively. The second specimen, with an initial radius of 11 mm, must have the same deformed hardness as the first specimen. Calculate the second specimen's radius (in mm) after deformation.
Hint: to achieve the same mechanical properties after cold work, both specimens must show the same %CW