Internal stresses analysis in the shrink-fitted joints of the assembled crankshafts

Abstract

The paper describes investigation results aimed to the assessment of the shrink-fitting of the marine diesel crankshaft elements. Since the crankshafts are of the large size (above 20 m) and weight (above 300 tons), the models were made in scale 1:5, keeping the same technical conditions. The measurement of internal stresses was made by a non-destructive ultrasonic method. The obtained results confirmed the existence of the zones where stresses had crossed the yield points, which meant the plastic deformation and weakening of the interference fit.