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IACS UR M71 - Crankshaft Scantling Check

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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

SymbolMeaningUnitSource
$T$Shaft torqueN·mpower / speed
$\sigma$Allowable shear stressN/mm²material + fatigue factor

Sources

  • IACS UR M71 Rev.2.