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Question
Which of the following section will be best in torsion?
fuEufyf[kr esa ls dkSu lk Hkkx ejksM+ esa lokZsÙke gksxk
A.
Solid circular
B.
Hollow circular
C.
Triangular
D.
Rectangular
Answer ( Option B)

Hollow circular

Solution

For a given amount of torsional moment, the section which develops least value of tmax (maximum shear stress) will be best.
(considering same weight of solid & hollow sections)
Also, square, rectangular, triangular and other polygonal sections have sharp edges or fillets which reduce surface area, thus increasing the stress in those places. Hence, they are not very effective in resisting stress against the torque.
∴Hollow circular section will be best in torsion.
 

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