Transactions of Materials and Heat Treatment

Title：3D finite element study on collapse instability for liner in bimetallic lined composite pipe

Authors： Gu Tianping1 Lian Zhanghua1 Wang Bin2 Cheng Xutang1 Shi Junlin1 Chen Junwen3

Unit： 1.State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation Southwest Petroleum University 2.Xi′an Sunward Aeromat Co. Ltd. 3.China Petroleum Engineering & Construction Corporation Southwest Company

KeyWords： bimetallic lined composite pipe liner instability critical buckling load critical collapse propagation pressure

ClassificationCode：TE973

year,vol(issue):pagenumber：2023,48(5):287-295

Abstract：

Aiming at the problem of collapse and instability for liner in bimetallic lined composite pipe, a 3D finite element mechanical model was established, and the relationship between critical bucking load and post-buckling configuration of the confined liner was studied. Then, the calculated results were compared with those of the 2D plane strain finite element model. Finally, the applicability of the two models was evaluated by the physical test. The results show that the relative error between the critical instability load calculated by 3D finite element model and the test results is 1.33%, the critical buckling load value of liner pipe is sensitive to defects, and the 0.6% out-of-roundness defect can reduce the critical buckling load by about 50%. There is almost no error in the calculation of critical buckling load values of the confined liner by using 2D and 3D models (length to diameter ratio L/D>6), but for the critical collapse propagation pressure Ppc of liner pipe, the calculated results by 3D model is closer to the test results. Therefore, the established 3D finite element mechanical model can accurately solve the critical instability behavior of confined liner, which provides a theoretical basis for the buckling-stop design of liner for bimetallic lined composite pipe and ensures the safe operation of the gathering and transportation system.

Funds：

国家自然科学基金面上资助项目(51974271)；中石油CPECC资助项目（CPECC2019KJ13）

作者简介：谷天平（1994-），男，博士研究生,E-mail：gutianping005@163.com;通信作者：练章华（1964-），男，博士，教授,E-mail：cwctlzh@swpu.edu.cn

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