深海复合材料立管与海底管线在极端海洋环境联合作用下的非线性流固耦合振动和动力屈曲、后屈曲特性研究

项目名称： 深海复合材料立管与海底管线在极端海洋环境联合作用下的非线性流固耦合振动和动力屈曲、后屈曲特性研究

项目编号： No.51279222

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 水利工程

项目作者： 李志敏

作者单位： 上海交通大学

项目金额： 80万元

中文摘要： 针对深海复合材料管线服役特点，对复合材料管线在环境和机械载荷作用下的后屈曲行为和非线性大挠度振动特性作了系统的研究，给出在渐近意义上严格满足边界条件的后屈曲和非线性振动的大挠度渐近解，发展和建立了计及横向剪切和刚度耦合效应在内的完全各向异性剪切圆柱壳屈曲和振动的边界层理论。录用和发表包括国际期刊OCEAN ENGINEERING、COMPOSITE STRUCTURES、J ENG MECH-ASCE和J PVT-ASME期刊等在内的第一作者SCI论文12篇，获得2010年度上海市优秀博士学位论文奖。 研究深海环境下海流和波浪等载荷对海底管线和立管的作用规律，采用解析法与数值解法相结合的方法，给出复合材料管线与立管非线性流固耦合振动和动力屈曲的大挠度解，通过参数分析揭示深海环境下复合材料管线和立管非线性动力屈曲和流固耦合振动特性的作用机理，为复合材料管线结构抑振和稳定性设计提供理论支持。

中文关键词： 结构非线性；后屈曲；非线性振动；复合材料壳体；二次摄动法

英文摘要： According to characteristics of ocean engineering practise, nonlinear vibration and postbuckling analysis are presented for a shear deformable composite cylindrical risers and pipe-lines subjected to thermomechanical loadings in the deepwater environment. The governing equations are based on a higher order shear deformation shell theory with von Kármán-Donnell-type of kinematic nonlinearity and including the extension/twist, extension/flexural and flexural/twist couplings. A singular perturbation technique is employed to obtain the asymptotic solutions satisfying the governing differential equations with the boundary conditions and determine the buckling loads and postbuckling equilibrium paths. A boundary layer theory for the buckling, postbuckling and nonlinear vibration of anisotropic laminated and 3D braided thick shells is established and developed. Supported by grants from the National Natural Science Foundation of China (No. 50909059), 11 SCI journal papers including OCEAN ENGINEERING, COMPOSITE STRUCTURES, J ENG MECH-ASCE and J PVT-ASME are published and Excellent PhD Dissertation Award is obtained from Shanghai Municipal Education Committee, in 2010. A new mechanical model of non-linear solid-fluid interaction vibration and dynamic buckling, postbuckling character of composite risers and submarine pi

英文关键词： structural nonlinearity；postbuckling；nonlinear vibration；composite shells；two-step perturbation method