Strength Design of Marine Diesel Engine Crankshaft

Abstract

The author describes empirical formulae of bending and torsional stress concentration factors for a crankshaft of marine engine and analytical methods for calculation of bending and torsional moment as well. He also describes a method of dynamical stress measurement and cites some examples of the results of analysing the stresses on crank fillet and additional stresses due to vibrations in crankshaft. Furthermore, bending and torsional fatigue tests of model crankshafts and defective materials making use of large specimens are summarized. The author concludes that the stresses of crankshaft can be approximately calculated by his investigations and strength design of crankshaft may become more precise when the additional stresses due to vibration are exactly calculated.