Torsion means, twisting of a shaft when a couple or torque is applied on it about longitudinal axis
Equation of Torsion
J=Polar Moment of Inertia
θ=Angle of twist in radian
L=length of shaft
Note: Angle of twist is maximum at the free end of the shaft
Shear stress is zero at the centre and maximum at the extreme fibre of the shaft
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