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The accurate prediction of bending stiffness and damage mode is important for understanding the bending mechanical behavior of reinforced thermoplastic pipe (RTP). Presently, adopting two-dimensional theoretical models, or simplifing three-dimensional stress state based on Lekhnitskii stress function, are the two main common approaches to analyse the bending performance of composite flexible pipes. The methods above, however are, difficult to accurately predict the stress distribution of each layer and the initial damage critical point of RTP under bending conditions. This paper firstly conducted geometric analysis of the section shape of RTP under bending conditions, and established a parametric representation method based on geometric analysis for the section deformation of each layer. Considering the nonlinear stiffness degradation of the material, a three-dimensional constitutive relationship of RTP was established. Then, combined with the virtual work principle, an analysis model for the bending mechanical properties of RTP was established. Further, the four-point bending test was carried out to verify the rationality of the theoretical model, and the influence of initial ovality and winding angle on the bending stiffness of RTP was analyzed. The results show good agreement between experimental data and theoretical model calculations. The bending stiffness of RTP is mainly affected by the winding angle and slightly affected by the initial ovality.
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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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