双金属复合管屈曲失效机理及临界载荷研究  

Research on Buckling Failure Mechanism and Critical Load of Bimetallic Composite Pipe

作　　者：肖世轩 吕志阳 朱学铭 曲琳 梁学泉 Xiao Shixuan;LüZhiyang;Zhu Xueming;Qu Lin;Liang Xuequan(College of Safety and Ocean Engineering,China University of Petroleum(Beijing))

机构地区：[1]中国石油大学(北京)安全与海洋工程学院

出　　处：《石油机械》2024年第5期138-144,共7页China Petroleum Machinery

基　　金：中国石油天然气集团有限公司-中国石油大学(北京)战略合作专项“‘一带一路’海外长输管道完整性关键技术研究与应用”(ZLZX2020-05)。

摘　　要：为探究双金属复合管的屈曲失效机理,利用ABAQUS软件建立了双金属复合管有限元模型,考虑成型残余应力的存在,分析了弯曲过程中弯矩、椭圆度和内衬褶皱幅值随曲率的变化规律;研究了内衬管屈服强度、内衬管径厚比以及外基管径厚比对双金属复合管屈曲失效的影响,并进一步给出了临界弯矩和临界曲率的预测公式。分析结果表明:屈服强度更高的内衬管可提高复合管的临界弯矩,但会降低复合管的临界曲率;更小的内衬管径厚比和外基管径厚比均可提高复合管的临界弯矩和临界曲率;相较于临界弯矩,内衬管屈服强度和径厚比的改变对临界曲率影响更为明显,外基管径厚比的改变则对两者均具有十分明显的影响;临界弯矩和临界曲率公式预测结果与有限元计算结果的相对误差不超过4%和12%。所得结论可为双金属复合管的设计和安全评价提供参考依据。In order to investigate the buckling failure mechanism of bimetallic composite pipe,the ABAQUS software was used to build a finite element model of it.Then,considering the existence of residual stresses during forming,the variation laws of bending moment,ellipticity and inner lining wrinkling amplitude with curvature during the bending process were analyzed.Finally,the influence of yield strength and radius-thickness ratio of inner lining pipe as well as the radius-thickness ratio of outer base pipe on the buckling failure of bimetallic composite pipe was studied,and the prediction formulas for critical bending moment and critical curvature were further presented.The analysis results show that the inner lining pipe with higher yield strength can increase the critical bending moment of the composite pipe,but will reduce the critical curvature of it.Smaller radius-thickness ratios of inner lining pipe and outer base pipe all can increase the critical bending moment and critical curvature of the composite pipe.Compared to the critical bending moment,the changes in the yield strength and radius-thickness ratio of the inner lining pipe have a more obvious influence on the critical curvature,while the changes in the radiusthickness ratio of the outer base pipe have a very obvious influence on both of them.The relative errors between the predicted results of the critical bending moment and critical curvature formulas and the finite element calculation results do not exceed 4%and 12%respectively.The conclusions provide a reference for the design and safety evaluation of bimetallic composite pipe.

关 键 词：双金属复合管 屈曲失效 内衬褶皱 径厚比 临界弯矩 临界曲率 

分 类 号：TE832[石油与天然气工程—油气储运工程]