Nonlinear Contact Between Inner Walls of Deep Sea Pipelines in Buckling Process

作     者：MA Weilin YU Jianxing ZHOU Qingji XIE Bin CAO Jing LI Zhibo 

作者机构：State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin University CNOOC Research Institute 

出 版 物：《Journal of Ocean University of China》 (中国海洋大学学报（英文版）)

年 卷 期：2015年第14卷第1期

页      面：75-83页

核心收录：

学科分类：081505[工学-港口、海岸及近海工程] 08[工学] 0815[工学-水利工程] 0824[工学-船舶与海洋工程] 0814[工学-土木工程] 082401[工学-船舶与海洋结构物设计制造] 

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 51239008 and 51179126) the National Science and Technology Major Project of the Ministry of Science and Technology of China (Grant No. 2011ZX05026-005) 

主　　题：deep sea pipeline buckling propagation nonlinear contact collapse pressure propagation pressure 

摘      要：In order to study buckling propagation mechanism in deep sea pipelines, the contact between pipeline s inner walls in buckling process was studied. A two-dimensional ring model was used to represent the pipeline and a nonlinear spring model was adopted to simulate the contact between inner walls. Based on the elastoplastic constitutive relationship and the principle of virtual work theory, the coupling effect of pipeline s nonlinear large deformation and wall contact was included in the theoretical analysis with the aid of MATLAB, and the application scope of the theoretical model was also discussed. The calculated results show that during the loading process, the change in external pressure is closely related to the distribution of section stress, and once the walls are contacting each other, the external pressure increases and then remains stable after it reaches a specific value. Without fracture, the pipeline section will stop showing deformation. The results of theoretical calculations agree well with those of numerical simulations. Finally, in order to ensure reliability and accuracy of the theoretical results, the collapse pressure and propagation pressure were both verified by numerical simulations and experiments. Therefore, the theoretical model can be used to analyze pipeline s buckling deformation and contact between pipeline s inner walls, which forms the basis for further research on three-dimensional buckling propagation.