Abstract
Spectral fatigue analysis is performed on the trimaran cross-deck structural detail. A global finite element (FE) model with local fine meshes at hot spot locations is built for the calculation of structural response. Three-dimensional linear potential flow theory and global FE analysis are used for wave load and stress transfer function calculations. Then, the hot spots’ fatigue damage is calculated, considering various factors influencing spectral analysis, which includes cycle counting correction factors, wave scatter diagram, and the distribution coefficient of wave headings. A full-scale model fatigue test is used to investigate the fatigue behavior of the cross-deck structural detail. Using the fatigue test data, the curve characteristic of the cross-deck structural detail is produced. Finally, the trimaran cross-deck structural detail’s fatigue characteristics are summarized and the effects of the factors influencing spectral fatigue analysis are reported.
Highlights
Trimarans are multihull ships that include a main hull and two small side hulls with cross-deck structure
As there is no clear stipulation on the distribution ratios of wave heading at present, for a similar ship type, we refer to the small water-plane area twin hull craft (SWATH) rule [25]
The trimaran’s fatigue characteristics are different than those of conventional ships, which is the result of the combined effect of wave load and ship structure characteristics
Summary
Trimarans are multihull ships that include a main hull and two small side hulls with cross-deck structure. Since they have better seagoing performance and can provide wider deck area compared to monohull vessels, trimarans have received considerable attention [1,2,3]. Due to their unique configuration trimarans experience severe structural loads and the fatigue problem of the cross-deck structure is serious [4]. The S − N curve approach can be further subdivided into the simplified method and the spectral method [7]
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