Drive shaft in torsion
Diameter D
10
-3
m
Diameter d
10
-3
m
Length L
m
Shear modulus G
10
9
Pa
Torque T
Nm
Polar moment of area Ip
10
-9
m
4
Section modulus S = Ip / (D/2)
10
-6
m
3
Shear stress τ
10
6
Pa
Angular twist φ
mrad
deg
Torsional stiffness k = dT / dφ
Nm/mrad
Nm/deg
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