Question

Maximum shear stress in a hollow shaft subjected to a torsional moment is at the

• A. Inner surface of the shaft
• B. Outer surface of the shaft
• C. Middle of the thickness
• D. None of the above

Answer 1

Answer:

B. Outer surface of the shaft

The maximum shear stress in a hollow shaft under torsional moment is at the outer surface of the shaft. This is because the value of r should be maximum for maximum torsional shear stress. Using the torsional formula, the maximum shear stress is given by $tau_{max} =(Tr_{max} )/(J)$ where r max is the outer radius of the hollow shaft. Thus, the maximum shear stress is at the outer surface of the shaft