Collapse Analysis of Imperfect Subsea Pipelines Based on 2D High-Order Nonlinear Model  

作　　者：余建星 李智博 杨源 孙震洲 

机构地区：[1]State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University

出　　处：《Transactions of Tianjin University》2014年第3期157-162,共6页天津大学学报（英文版）

基　　金：Supported by the National Science and Technology Major Project of the Ministry of Science and Technology of China(No.2011ZX05026-005);the National Natural Science Foundation of China(No.51239008);the National Basic Research Program of China("973"Program,No.2014CB046800)

摘　　要：To study the collapse of imperfect subsea pipelinos, a 2D high-order nonlinear model is developed. In this model, the large deformation of the pipes is considered by raiaining the high-order nonlinear terms of strain. In addi-tion, the J2 plastic flow theory is adopted to describe the elasioplastic constitutive relations of material. The quasi-static process of collapse is analyzed by the increment method. For each load step, the equations based on the principle of virtual work are presented and solved by the discrete Newton＇s method. Furthermore, finite element simulations and full-scale experiments were preformed to validate the results of the model. Research on the major influencing factors of collapse pressure, including D/t, material type and initial ovality, is also presented.To study the collapse of imperfect subsea pipelines, a 2D high-order nonlinear model is developed. In this model, the large deformation of the pipes is considered by retaining the high-order nonlinear terms of strain. In addition, the J2 plastic flow theory is adopted to describe the elastoplastic constitutive relations of material. The quasi-static process of collapse is analyzed by the increment method. For each load step, the equations based on the principle of virtual work are presented and solved by the discrete Newton's method. Furthermore, finite element simulations and full-scale experiments were preformed to validate the results of the model. Research on the major influencing factors of collapse pressure, including D/t, material type and initial ovality, is also presented.

关 键 词：IMPERFECTION subsea pipelines COLLAPSE NONLINEARITY initial ovality 

分 类 号：N945.12[自然科学总论—系统科学]