Question

1. (40 points) A shaft machined from AISI 1020 CD steel is shown in the figure below. The fillet radius is 3mm. A force is applied to the shaft causing a completely reversed bending moment of 420N-m at the shaft shoulder. In addition there is a steady torsion moment throughout the shaft of 400N-m. 500 25 D 35 D 3 R -50 D 25 D 20 20 20 20 180 280


A) using reliability of 90% assuming full notch sensitivity determine the fatigue factor of safety at the shaft shoulder using goodman criteria.


B) determine the static yielding factor of safety at the shaft shoulder.


solve correctly a and b
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