The figure shows a shaft mounted in bearings at A and D and

The figure shows a shaft mounted in bearings at A and D and having pulleys at B and C. The forces shown acting on the pulley surfaces represent the belt tensions. The shaft is to be made of AISI 1035 HR steel. Using a distorted energy theory with a design factor of 2, determine the minimum shaft diameter to avoid yielding.

6-in D. 300 lbf 50 lbf 59 lbf 392 lbf D 8-in D. C 6 in 8 in A 8 in

Solution

Answer for Minimum shaft diameter to avoid yielding is

d=0.7026 inches.

Note that power of the d^3 terms . A 26% change in diameter doubles the factor of safety