# Two Section Circular Section - Torsional Loading

# Notation and Units

## Metric and Imperial Units

The above formulas may be used with both imperial and metric units. As with all calculations care must be taken to keep consistent units throughout with examples of units which should be adopted listed below:

# Notation

- L = length under consideration, in or mm
- G = shear modulus or modulus of rigidity, psi or MPa
- J = polar moment of inertia, in
^{4}or mm^{4} - r = radial distance from centre to point of interest, in or mm
- T = applied or resulting torsion, lb.in or Nmm
- θ = angle of twist, degrees
- µ = strain energy, ib.in or Nmm