By modern standards, the shaft design of Problem 5-76 is poor because it is so long. Suppose it is redesigned by halving the length dimensions. Using the same material and design factor as in Problem 5-76, find the new shaft diameter.

Data in Problem 5-76

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 CD steel. Using a conservative failure theory with a design factor of 2, determine the minimum shaft diameter to avoid yielding.

Transcribed Image Text:

Problem 5-76 20 ¡A 300 lbf 8 in 6-in dia. 50 lbf B 8-in dia. 8 in 59 lbf 392 lbf D C 6 in