309 Finding the Diameter of a Propeller Shaft Transmitting a Power

Problem 309
A steel propeller shaft is to transmit 4.5 MW at 3 Hz without exceeding a shearing stress of 50 MPa or twisting through more than 1° in a length of 26 diameters. Compute the proper diameter if G = 83 GPa.
 

Solution 309

 

In reply to by fatigue01

the outermost fiber of a material is where the shearing stress is at maximum that is why we always use the outside diameter of a shaft when dealing with torsion