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The fatigue crack propagation analysis process of large ocean structures based on fracture mechanics is complex and computationally inefficient. This paper draws on the basic idea of the traditional S-N curve method for calculating fatigue life, constructs a stress intensity factor transfer function, and proposes a spectrum-based fatigue crack propagation analysis method for ocean structures. By combining the Python programming language with SESAM, ABAQUS, and FRANC3D calculation software, an efficient automatic crack propagation program was developed to achieve fatigue crack propagation analysis and residual life prediction of large and complex marine structures based on spectrum analysis. A multi-scale sub-model technology was used to realize the transformation of the model from the shell to the solid, solving the problem of the fusion of large-scale structures and small-sized cracks. Using the self-developed automatic crack propagation program system, the influence of fatigue hotspot (D1, D2, D3) on crack propagation behavior and fatigue life was analyzed and it was found that the crack size increases exponentially during service. The stress intensity factor transfer function has a similar shape for the same node, but varies significantly between differen nodes. The fatigue lives of D1, D2, and D3 are 11.3 years, 17.3 years, and 33.1 years, respectively. The initial crack size has a significant effect on fatigue life, and the crack length-to-depth ratio has a greater impact on the crack propagation process than on fatigue life.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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