Estimation of the fatigue damage for an ice class vessel under broken ice condition using a simplified method

초록

In this study, a simplified analysis method was developed to evaluate the fatigue damage of an ice class vessel under broken ice condition. The ice resistance, which is essentially calculated at the design stage of the ice class vessel, and the hull form information were used to estimate the local ice load acting on the outer-shell of the ship. The local ice load was applied to the finite element analysis model, and the Weibull parameters for the target fatigue point were derived. Finally, fatigue damage was evaluated by applying the S-N curve and the Palmgren-Miner rule. For the verification of the proposed simplified method, numerical analyses using direct approach were performed for the same conditions. A numerical model that implements the interaction between ice and structure was introduced to verify the local ice load calculated from the simplified method. Finally, the fatigue analyses of the Baltic Sea for actual ice conditions were performed, and the results of the simplified method, the direct analysis method, and the LR method were compared. © 2019, Lulea University of Technology. All rights reserved.

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