Abstract
Based on the force analysis of a high strength marine diesel engine crankshaft in one cycle, the crankshaft fatigue strength checking method of Classification Society was used to check the crankshaft. It can be known that the empirical formula method is more conservative according to comparing the acceptability factor which are calculated by empirical formula method and finite element method. The nominal alternating torsional stress is determined by the inverse method of crankshaft fatigue strength checking method, which is the criterion of fatigue strength of the crankshaft. The fatigue strength of crankshaft can be improved by increasing fillet radius, web thickness or web width.
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