锻压技术

双金属衬里复合管内衬塌陷失稳三维有限元研究

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

单位：1.西南石油大学油气藏地质及开发工程国家重点实验室 2.西安向阳航天材料股份有限公司 3.中国石油工程建设有限公司西南分公司

分类号：TE973

出版年,卷(期):页码：2023,48(5):287-295

摘要：

针对双金属衬里复合管的内衬塌陷失稳问题，建立了三维有限元力学模型，研究了受限内衬临界失稳载荷与后屈曲构型之间的相互关系，并将计算结果与二维平面应变有限元模型的计算结果进行了对比，最后通过实物实验评价了两种模型的适用性。结果表明：使用三维有限元模型计算的临界失稳载荷值与实验结果的相对误差为1.33%；衬管的临界失稳载荷值是缺陷敏感的，0.6%的不圆度缺陷会使其临界失稳载荷下降约50%；二维模型与三维模型（长径比L/D＞6）计算的受限内衬的临界失稳载荷值几乎无误差，但对于计算衬管的临界坍塌扩展传播压力Ppc，三维模型的计算结果更接近实验结果。建立的三维有限元力学模型可以准确地求解受限内衬的临界失稳行为，为双金属衬里复合管的内衬止屈设计、保证集输系统安全运行提供了理论依据。

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.

基金项目：

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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