Question

27. A customer has specified flat-rolled sheet with a thickness of 0.065 inches and a tensile strength of 70 ksi. What starting thickness should be specified in order to roll a product that meets the customer requirements? (Use the property vs. cold work relationships below) SHOW ALL WORK! (4 points)

Answer 1

t_f = 0.065 in For tensile strength of 70 ksi, cold work % is 30 % & cold work % is given by cold work % = change in Area of cross section/original Area times 100 => 30 = -(b t_f - b t_i/b t_i) times 100 {let 'b' be the width of sheet & it doesn't changes} => 30 t_i = -(0.065 - t_i) times 100 => t_i = 0.092857 => t_i = 0.0929 in