A 1-in-diameter solid round bar is made of AISI 1040 CD steel (sy= 71 kpsi, su = 85 kpsi ). It is operating at a temperature of 300°F, and is subjected to a purely reversing torque of 2000 Estimate the number of cycles to failure if the expected reliability is 99%. Redo the solution for a reversing torque of 8500 Note: The Von Mises stress for pure torsion would be o' = √37²