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Torsional spring constant cable

To obtain a torsional spring constant (torsional stiffness, rotational spring stiffness) for an insulated power cable, the cable is commonly modeled as a torsion bar/shaft. Then $k_{\theta}$ is the torsional stiffness, the torque per angle of twist.

Symbol
$k_{\theta,tot}$
Unit
N.mm/rad
Formulas
$\frac{G_{tot} J_{tot}}{L_{span}}$
Related
$G_{tot}$
Shear modulus cable [GPa]
$J_{tot}$
Moment of inertia (bending) cable [mm$^4$]
$L_{span}$
Span between clamp [mm]