scope:

This class guideline contains an alternative method to the method given in IACS UR M53 for calculation of safety against fatigue failure in pin and journal fillets and in oil bores.

In principle, any relevant calculation method may be applied, e.g. the fatigue criteria assume that maximum respectively minimum bending stresses occur simultaneously with the maximum respectively minimum torsional stresses.

If properly documented, an evaluation of the fatigue capacity by using multi-axial fatigue methods may replace the criteria applied in this class guideline.

A crankshaft will be approved when the calculation methods, as presented in this class guideline, is fulfilled. Crankshafts that cannot satisfy these rules may be subject to special consideration when detailed calculations and/or measurements are made to demonstrate equivalence to these rules.