含凹坑缺陷管道环焊缝应力有限元分析  

Finite element analysis of stress of pipe girth welds with pit defects

作　　者：储玲玉 刘觉非 苏林 毛瑞麒 徐杰[1] 鲍庆河 李鑫 CHU Lingyu;LIU Juefei;SU Lin;MAO Ruiqi;XU Jie;BAOQinghe;LI Xin(School of Materials Science and Physics,China University of Mining and Technology,Xuzhou 221116,China;SINOPEC Oil&Gas Pipeline Inspection Co.,Ltd.,Xuzhou 221008,China;Xuzhou BUT Construction Machinery Joint-stock Co.,Ltd.,Xuzhou 221004,China)

机构地区：[1]中国矿业大学材料与物理学院,江苏徐州221116 [2]中石化长输油气管道检测有限公司,江苏徐州221008 [3]徐州巴特工程机械股份有限公司,江苏徐州221004

出　　处：《电焊机》2021年第4期8-13,I0003,共7页Electric Welding Machine

基　　金：国家自然科学基金资助项目(51301197);江苏省自然科学基金资助项目(BK20130182);中国石油化工股份有限公司资助项目(318019-2);国家重点研发项目(2018YFB2001204);大学生创新训练项目(202010290125Y)。

摘　　要：基于有限元方法,采用ABAQUS有限元仿真模拟软件,参考实际管道环焊缝的坡口形状和热影响区材料的软化现象,建立了含凹坑缺陷管道环焊缝非线性有限元分析模型,对不同载荷作用下的含凹坑缺陷管道环焊缝进行应力分析,探讨了凹坑尺寸、焊缝余高以及热影响区材料属性等因素对应力分布的影响规律。结果表明:凹坑周边发生明显的应力集中,凹坑深度对管道极限承载力影响显著,随着凹坑深度的增加,腐蚀管道的最大等效应力显著增大,且峰值应力集中在焊缝区;腐蚀管道在极端拉伸载荷作用时,焊缝余高内凹坑缺陷的最大等效应力集中在热影响区;凹坑深度大于余高时,最大等效应力位于焊缝中心的凹坑边缘。This paper based on the finite element method,using ABAQUS software,referring to the groove shape of the actual pipe girth weld and the softening phenomenon of the heat-affected zone material,a nonlinear finite element analysis model of the pipe girth weld with pit defects is established.The stress of pipe girth welds with pit defects under different loads was analyzed.The influence of pit size,weld reinforce-ment and material properties of heat-affected zone on the stress distribution of circumferential welds of pipelines with pit defects was discussed.The results show that obvious stress concentration occurs around the pit,and the depth of the pit has a significant influence on the ultimate bearing capacity of the pipeline.As the depth of the pit increases,the maximum equivalent stress of the corroded pipeline increases significa-ntly,and the maximum stress is concentrated in the weld zone.When the pipeline is under extreme tensile load,the maximum equivalent stress of the pit defect in the weld reinforcement is concentrated in the heat-affected zone;when the depth of the pit is greater than the reinforcement,the maximum equivalent effect force is located at the edge of the pit in the center of the weld.

关 键 词：管道环焊缝 凹坑缺陷 焊缝余高 有限元分析 安全评估 

分 类 号：TE88[石油与天然气工程—油气储运工程]