Abstract
In order to investigate the fatigue behaviour of trimaran cross-deck structural details, the spectral and simplified fatigue analysis approaches are proposed. In spectral fatigue approach, three-dimensional (3D) linear potential flow theory and global FE analysis are used for wave loads and stress transfer functions calculation; the stochastic spectral fatigue analysis is carried out considering the weighted wave headings factors. In simplified fatigue approach, based on the direct calculation procedure of LR rules, the evaluation of simplified fatigue loads and loading conditions are presented, and the stress ranges are obtained by global finite element (FE) analysis. Then the fatigue lives of a few hot spots are computed to demonstrate the application of the proposed method. The result shows that the method given in this paper has a good applicability. This study offers methodology for the fatigue analysis of trimaran cross-deck structure, which may be regarded as helpful references for structural design of these types of ships.
Highlights
Trimarans, being high-performance ships, have attracted more and more people’s attention in recent years
This study offers methodology for the fatigue analysis of trimaran cross-deck structure, which may be regarded as helpful references for structural design of these types of ships
Fang et al used 3D translating-pulsating source distribution model to study the global loads of a trimaran in oblique waves, and the wave loads based spectral analysis for the optimal selection of trimaran side hulls arrangement are proposed [9, 10]
Summary
Trimarans, being high-performance ships, have attracted more and more people’s attention in recent years. Mathematical Problems in Engineering linear cumulative damage criteria, which has been widely used for marine structure fatigue assessment It can be further subdivided into the “simplified fatigue method” and “spectral fatigue method”. When the fatigue strength assessment is done according to conventional vessels’ fatigue guidelines, especially using the “simplified fatigue method”, there are some difficulties for the unique cross-deck structure. There is a great significance of an in depth research on fatigue strength assessment of trimaran especially fatigue problems related to the cross-deck structure. In order to investigate the fatigue behaviour of cross-deck structural details, a suitable simplified fatigue approach for trimaran is explored, which refers to the existing fatigue guidelines of conventional ships and the direct calculation procedure of LR rules for trimaran. The fatigue characteristic of trimaran cross-deck structure is summarized, which includes the most dangerous fatigue position and the fatigue damage proportion of various wave heading directions
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