engleski

Fatigue assessment of marine structures

This paper reviews recently developed models for fatigue damage of marine structures accounting for several structural imperfections and different types of loadings. The studied imperfections are generally present in the stress response characteristics and fatigue damage model applied. Besides commonly present uncertainties in fatigue ship structural analysis associated with structural modelling and the random wave induced loading there are also uncertainties arising from imperfection of structural joint that may occur during manufacturing and service life and the interaction between wave induced load and structure. The paper discuses the influence of the imperfections over the hot spot stress distribution and not with the reasons for their appearance. The long-term stress range acting on the elements is defined within a stochastic analysis as a function of wave induced pressure stresses that are combined with the stresses resulting from the vertical wave induced bending moment of the ship hull. Structural analysis is performed by the finite element method utilizing sub-model techniques. This work also deals with the fatigue assessment of marine structures, describing several steps of the calculation accounting for the combination of low- and high-frequency induced loading. Fatigue damage is calculated based on the Palgrem-Miner approach.

Fatigue Damage; Fatigue Assessment; Marine Structures; Imperfections; Hot-Spot Stress

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