Crankshaft pin and journal diameter screening per IACS UR M71 - simplified minimum shaft formula used for scantling approval.
Formula
$$ d_{min} = \left(\frac{16 T}{\pi \sigma}\right)^{1/3} $$Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $T$ | Shaft torque | N·m | power / speed |
| $\sigma$ | Allowable shear stress | N/mm² | material + fatigue factor |
Sources
- IACS UR M71 Rev.2.