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Mooring lines are prone to fatigue damage or even fracture due to the long-term exposure of floating wind turbine to marine environmental loads. At present, the mainstream S-N/T-N curve methods have many defects, such as high discretization of results and inability to consider initial cracks. The fracture mechanics method can analyze the fatigue life of structures with initial cracks. However, the analysis of large structures by fracture mechanics is inefficient and complex, and it is difficult to achieve accurate prediction from time-domain load analysis to fatigue life using a single general software. In this paper, a framework based on PYTHON for fatigue crack propagation was constructed, and a fatigue crack propagation program for mooring lines was developed based on the fracture mechanics method in conjunction with SESAM, ABAQUS, and Franc 3D softwares, which enables the simulation of fatigue crack propagation processes under different sea conditions. Secondly, as an example, the fatigue life of No.1 mooring line of OC4 semi-submersible floating wind turbine was calculated by using this program. Finally, the parametric study of the anchor chain was carried out, based on the fatigue life calculation results of No.1 mooring line. The results show that the crack growth rate in the crown section of the mooring chain is the fastest, and the fatigue life is the shortest, which is about 74% and 36% of those in the bending section and the straight section, respectively. The initial crack morphology has a significant effect on the fatigue life of mooring cable. The increase of the initial crack size and the decrease of length-depth ratio both result in a decrease in the fatigue life of mooring lines. The research work can provide technical support for the design and analysis of mooring line of floating wind turbines.
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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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