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As an important hub connecting offshore oil and gas fields and offshore platforms, unbonded flexible pipes play a vital role in marine production. As one of the main bearing parts of flexible pipes, the failure of the tensile armor layer will threaten the integrity of a pipeline system. Therefore, it is of great theoretical significance and engineering practical value to clarify the influence mechanism of various defects on the mechanical properties of the tensile armor layer and to study the mechanical behavior of the tensile armor layer. The axial compression performance of the tensile armor layer of an unbonded flexible pipe with defects was studied by numerical simulation method. A five-layer unbonded flexible pipe axial compression finite element model was established. The effects of non-metallic layer defect size, interlayer friction coefficient and steel strip fracture on the axial compression stiffness and critical buckling load of the flexible pipe were studied. The research results show that the decrease in the friction coefficient caused by the increase in the annular water content will significantly reduce the critical buckling load, and that the defects in non-metallic layer and the fracture of steel strip will significantly reduce the axial compression stiffness and critical buckling load. Therefore, in engineering, more attention should be paid to the annular water content and the structural integrity of each layer. The results can provide a reference for flexible pipe design and integrity management.
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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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