受外压含缺陷夹层管非线性屈曲分析  

Nonlinear Buckling Analysis of Defected Sandwich Tubes under External Pressure

作　　者：边叶凯 耿岱 张强[1] 王文强 汪彦龙 BIAN Yekai;GENG Dai;ZHANG Qiang;WANG Wenqiang;WANG Yanlong(School of Mechanical Science and Engineering,Northeast Petroleum University,Daqing 163318,China)

机构地区：[1]东北石油大学机械科学与工程学院,黑龙江大庆163318

出　　处：《石油矿场机械》2024年第4期28-33,共6页Oil Field Equipment

基　　金：国家自然科学基金“高温高压多级压裂管柱振动诱发封隔器蠕动失封机理研究”(52374034)。

摘　　要：为了研究外压作用下夹层管非线性屈曲问题,使用有限元软件ANSYS建立夹层管模型,通过线性屈曲分析获得的屈曲模态制作非线性屈曲的初始缺陷,对受到外压的夹层管进行非线性屈曲分析。研究表明:含有模态缺陷的夹层管在受外压屈曲过程中,会在管径方向产生变形,包括压缩变形和膨胀变形,变形沿轴向传播,压缩变形量始终大于膨胀变形量;使用拐点法,即二者的比值来判定夹层管是否失稳,此方法可以精准判断夹层管失稳外压值,对初始缺陷相同,壁厚比不同的内外管和夹芯层失稳外压进行了分析。研究成果可为夹层管的应用提供借鉴。In order to study the nonlinear buckling problem of the sandwich tube under external pressure,the finite element software ANSYS was used to establish a model of the sandwich tube,and the initial defects of nonlinear buckling were generated by the buckling modes obtained from the linear buckling analysis,and the nonlinear buckling analysis was carried out on the sandwich tube under external pressure.It is found that in the process of buckling under external pressure,the laminated pipe containing modal defects produces deformation in the direction of pipe diameter,including compression deformation and expansion deformation,and the deformation propagates along the axial direction,and the amount of compression deformation is always larger than the amount of expansion deformation.With the inflection point method,that is,the ratio of the two to determine whether the sandwich tube is unstable or not,this method can accurately determine the value of external pressure of the sandwich tube instability.In addition,this inflection point method can be used to analyze the destabilized external pressure of internal and external pipes and sandwich layers with the same initial defects and different thickness-to-diameter ratios.The research results can provide reference for the application of sandwich tubes.

关 键 词：夹层管 非线性屈曲 失稳压力 压缩变形 膨胀变形 

分 类 号：TE931.2[石油与天然气工程—石油机械设备]