Experimental Research on Fatigue Strength and S-N Curve Fitting of Special Structural Joints of Ships

摘要

In this paper, the S-N curves’ characteristics of structural joints of theexample ship were studied through real scale model fatigue experiment.The key areas with serious fatigue problems were identified throughfinite element calculation, from which three joints with special structureform were selected as the research objects of this experiment. Thefatigue experiment models were designed and the fatigue strengthexperiment of each joint under multiple load conditions were conducted.(P-)S-N curves for each joint were fitted on the basis of theexperimental results. The fitted P-S-N curves were applied to thefatigue strength assessment of the joints, and the results were comparedwith those obtained by the existing CCS S-N curves.