Polar Modulus of Shaft Section is Equal to

Answer: (A)- πd³/16

The polar modulus of shaft section is equal to πd³/16.

Solution: Torsional section modulus or polar modulus of shaft section is equal to the ratio of polar moment of inertia to the radius of the shaft. It is denoted by Zp.

For a solid shaft, Z_p= J/r= (πd⁴/32)(D/2) = πd³/16   

Where, 

• J- Polar moment of inertia.
• D- Diameter of the shaft.

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