Sometimes it might be necessary to calculate the torsional stiffness of a part. The reason for this could be to conduct a vibrational analysis, or to get a general idea of how strong that part is when the loading is not known. To calculate torsional stiffness equation 1 would be used.

k = Stiffness

T = Torque

Φ = Angle of Twist

J = Polar Moment of Inertia

G = Shear Modulus

L = Rod Length

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