摘要
环向裂纹是管道环焊缝的一种常见缺陷,它降低了管道的承载能力.为了研究管道运营压力、沉降弯矩对裂纹嘴张开位移(CMOD)的影响,建立了含管帽的试验管模型,分析了试验压力和弯矩对环向裂纹CMOD的作用.考虑试验压力效应包含作用于管内壁的环向薄膜力和作用于管帽的轴向力,为获得管道运营压力(通常仅产生环向薄膜力)对CMOD的影响,建立不含管帽的有限元模型,分析运营压力和弯矩对CMOD的影响.通过比较含/不含管帽的模拟结果,可评估弯管区域的压力效应对CMOD的影响程度.通过模拟分析可知,在管道设计压力范围内,内压的环向薄膜力效应和轴向力效应均对环向裂纹的CMOD影响不大,弯矩是决定CMOD大小的主导因素.
The circumferential crack is a common defect of the pipe weld joint,which reduces the bearing capacity of the pipe.In order to studythe effect of pipe operating pressure and settlement bending moment on crack mouth opening displacement(CMOD),a test tube model(including pipe caps)is established,and theeffect of test pressure on the circumferential crack under constant bending moment is analyzed.The test pressure effect includes a hoop force acting on the inner wall of the pipe and an axial force acting on the cap.In order to obtain theeffect of pipeline operation pressure(usually only producing circumferential membrane forces)on CMOD,a finite element model without caps is established to further analyze the impact of operating pressure on CMOD.By comparing the simulation results with/without caps,the effect of the pressure effect in the elbow region on CMOD can be evaluated.Throughsimulation analysis,it can be seen that within the designed pressure range of the pipeline,the effect of the annular membrane force and the axial force of the internal pressure have little effect on the CMOD of the circumferential crack,andthe bending moment is the dominant factor determining the size of the CMOD.
作者
何清亮
张恒
成志强
HE Qingliang;ZHANG Heng;CHENG Zhiqiang(School of Mechanics and Engineering, Southwest Jiaotong University, Chengdu 610031, China;Beijing Oil and Gas Control Center, China National Petroleum Corporation, Beijing 100007, China)
出处
《成都大学学报（自然科学版）》
2018年第4期434-437,共4页
Journal of Chengdu University（Natural Science Edition）
基金
教育部高等学校博士点专项科研基金(20110184110017)资助项目
关键词
管道
环向裂纹
组合荷载
CMOD
有限元分析
pipeline
circumferential crack
combined load
CMOD
finite element analysis
