Fatigue and Variable Loading Example 4 In the figure below the shaft is simply supported in ball bearings at A and D. The shaft rotates and the stationary load F is 6.8 kN. All fillets have a 3-mm radius. The shaft is machined from AISI 1050 cold- drawn steel. Estimate the life of the part. Repeat with: working temp T=330 °C, reliability R=90% 30 A ◄ R₁ 10 250 32 B 75 (a) 6.8 kN 38 C 100-125 10->> -35 D R₂ 30

A solid round bar with diameter of 2 in has a groove cut to a diameter of 1.8 in, with a radius of 0.1 in. The bar is not rotating. The bar is loaded with a repeated bending load that causes the bending moment at the groove to fluctuate between 0 and 25 000 lbf in. The bar is hot-rolled AISI 1095, but the groove has been machined. Determine the factor of safety for fatigue based on infinite life and the factor of safety for yielding. Plars & .

The shaft shown in the figure is machined from AISI 1040 CD steel. The shaft rotates at 1600 rpm and is supported in rolling bearings at A and B. The applied forces are F1 = 1600 lbf and F2 = 640 lbf. A steady torque of 1600 lbf·in is being transmitted through the shaft between the points of application of the forces. ——————————————- Determine the endurance limit for this material as well as the value after correction for surface finish, sizing, and loading. (You must provide an answer before moving to the next part.) The endurance limit for this material is kpsi. The value after correction for surface finish, sizing, and loading is kpsi.

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