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The polar environment is cold, complex, and characterized by a lack of data. Aluminum alloy multi-environment boats navigating in polar regions will encounter four types of interface conditions, including waves, water ice, snow, and ice-water interfaces. Therefore, it is necessary to conduct research on the fatigue damage of aluminum alloy multi-environment boats in low-temperature environments. This paper is based on a time-domain analysis method analyzing the stress response of the boats under four types of interface loads. The rainflow counting method was used to statistically analyze the time history of hot spot stresses, and the final damage and fatigue life were calculated based on the Miner linear cumulative damage theory. On this basis, the damage sensitivity to ship speed, interface height, and ice density was analyzed. The results indicate that wave impacts and water ice loads contribute significantly to hull damage, with ice density being the most significant factor affection damage. Fatigue tests were conducted on low-temperature aluminum alloy materials, welded joints, and actual ship nodes. The S-N curve of low-temperature aluminum alloy was fitted, and the reliability of the S-N curve was verified through fatigue tests of actual ship nodes. The research findings can be utilized for the fatigue assessment of 5059 aluminum alloy boats in low-temperature environments.
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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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