The two shafts of Problem 6.2 have a shear yield strength τY = 150 MPa, and their mode of failure is general yielding. Determine the factor of safety required in the design of each shaft for the design torsional load T = 80.0 kN ⋅ m.
Problem 6.2
A solid steel shaft (G = 77.5 GPa) has a diameter of 200 mm and a length of 1.20 m. A second Steel shaft also has a diameter of 200 mm and a length of 1.20 m. However, to save weight, a concentric longitudinal hole is drilled through the second shaft, reducing its weight by 50%.
a. Compare the maximum shear stress in the two shafts for a torque T = 80.0 kN ⋅ m.
b. Compare the torsional stiffness GJ of the shafts,
c. Discuss the results of parts (a) and (b).
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