Rotational Stiffness Calculator
Free calculate torsional stiffness k = g×j/l for shafts and rods. determine rotational spring constant for mechanical systems.
Input Parameters
For circular shaft: J = πr⁴/2
Results
Enter parameters to calculate rotational stiffness
Rotational Stiffness Formula
Formula
k = (G × J) / L
Where:
- • k = rotational stiffness (N·m/rad)
- • G = shear modulus (Pa)
- • J = polar moment of inertia (m⁴)
- • L = length (m)
Polar Moment of Inertia
For circular shaft:
J = πr⁴/2
Where r is the radius