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The deep-sea pressure structure gradually presents the characteristics of a medium-thick shell, and their structural stress characteristics are significantly different from those of a traditional thin shell. Taking a deep-sea unmanned system head cover reinforced with rectangular ribs as the object, the strength of medium-thick shells was studied based on the three dimensional stress analysis method of ring-stiffened cylindrical shells. Firstly, the correctness of the calculation of the three dimensional stress method on the cylindrical shell was tested by examples in other literatures, then the typical stress calculation of the main structure of head cover and the stress characteristics of the medium-thick shell were studied, and finally the stress level and distribution of the shell and rib in the typical area of the head cover were calculated based on the assumption of the equivalent rib spacing. Compared with the finite element simulation calculation and model test results, the three dimensional stress analysis method has good applicability and engineering accuracy for the stress calculation of medium-thick shell pressure structures, which can provide a reference for the strength analysis of deep-sea pressure structures and the theoretical research of medium-thick shells.
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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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