2.6 2.2 KN 1.8. 1.05 1.4 1.02 D/d=1.30 1.0 0 0.05 0.10 0.15 rld 0.20 0.25 0.30 Problem Statement: A solid round bar with diameter D = 1 in, net diameter d = 0.9524 in, has a groove with radius = 0.04762 in, as shown in the Figure. The bar is made of steel SAE 1020 CD with SVT = 68 kpsi, endurance S = 34 kpsi, and f = 0.9. The bar is subjected to reversing torque T = +2.5 klfb-in, in phase with a push-pull force = +8 klbf. Estimate the life N. Use Eqs. 6-34 and 6-35 for notch sensitivity, not Fig. 6- 20/21. Assume N = 10, Ne = 10. Calculate the component intercept a of the high-cycle fatigue line. Calculate the component slope b of the high-cycle fatigue line. Calculate the fatigue normal-stress concentration Kf adjusted for notch sensitivity. Calculate the fatigue shear-stress concentration Kf, adjusted for notch sensitivity. Calculate the number of cycles N to failure. Hint: Sur should not be reduced to 0.67SUT when using von Misses to combine stress components, even if shear due to toque is the largest stress. Answer tolerance 10% for Q5 and 2% for everything else. Be sure to include units and the correct sign with your answers. Carry at least 4 significant digits for everything. Your answers: a (no units) b (no units) = Kfn (no units) Kfs (no units) = 110.16 -0.0851 1.8281 1.400 N (no units) =