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Abstract

The paper reviews the fatigue problems of the main shafting in ships and in particular those associated with the crankshaft of a diesel installation. A description is given of an investigation on the bending moments and torques in multi-throw crankshafts.

Details are given of bending and torsion tests on single throw cranks leading to the determination of correction factors for crank radius and crankpin length. A multi-throw shaft was then installed in a purpose-built rig and bending moments and torques were measured on crankpins and journals when loads were applied to the crankpins. A computer programme was developed which utilized the three factors determined from the single throw work to calculate these same bending moments and torques. Satisfactory comparative tests were carried out and the results from one typical series of tests are detailed.

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The Stress Analysis of Crankshafts

Abstract

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References