復(fù)合材料海洋立管屈曲和止屈研究
[Abstract]:With the development of society, energy is becoming more and more important in social progress and development. Marine riser is an important component of offshore oil and gas exploitation and transportation, and composite riser has the advantages of good flexibility, corrosion resistance, easy transportation and installation compared with metal riser, so it has become a new choice for offshore oil and gas pipelines. However, composite risers are more prone to buckling in marine environment than traditional steel pipes. Therefore, it is of great theoretical and practical value to study the buckling and anti-buckling methods and to produce, install, service and maintain composite risers. In order to explore the factors affecting the buckling resistance of composite risers, a model for buckling analysis of composite risers is established based on nonlinear ring theory and virtual work principle. The effects of geometric dimension (length, diameter, thickness of composite riser), composite layer angle and number of layers on the buckling resistance of composite riser were investigated by using ANSYS and ABAQUS software, and the model size of composite riser was optimized. Then, in order to make the results more suitable to the actual working conditions, three kinds of initial defects were applied to the original riser model: initial displacement defect, initial ellipticity defect and delamination defect. The effects of three kinds of initial defects on the buckling ability of composite risers under plane compression and the mechanism of the effects of each initial defect on the buckling of composite risers were investigated. Finally, combined with the above research results, the effect of the anti-buckling device and the anti-buckling principle of the anti-buckling device are investigated, and the effect of the anti-buckling device in the case of initial defects is explored, which is suitable for the composite riser in this paper. So far, the design and installation of the bender provide some theoretical basis, and also provide some theoretical guidance for the design, installation and maintenance of composite riser. It is found that the longer the riser, the weaker the buckling resistance of riser. The more layers the riser has, the stronger the buckling resistance of riser is. The two kinds of anti-buckling ability of the laminated tube are opposite, and the two kinds of anti-buckling ability of the riser are relatively balanced when the stacking angle is about 50 degrees. The effect of the initial defect on the buckling ability of the riser is very great. The mechanism of the effect on the buckling ability of the riser is that the initial defect will make the defect part of the riser more prone to local buckling when it is subjected to external compression, and then the buckling will expand and spread to the whole riser. Cause the riser to buckle and crush. It is of great help to improve the buckling ability of the tube with proper buckling arrester. The mechanism of the anti-buckling device is that the buckling device blocks the propagation of local buckling and makes the riser appear high-order buckling, which enhances the anti-buckling ability of the riser, and the initial defect has a certain inhibitory effect on the anti-buckling effect of the riser.
【學(xué)位授予單位】:哈爾濱工業(yè)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:P756.2
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