摘要
为了评价母材、根焊材料、填充焊材料的强度对X80管道环焊缝应变能力的影响,采用非线性有限元方法,以中俄东线直径1 422 mm、壁厚21.4 mm的高纲级管道为研究对象,考虑焊接接头完整几何形貌与性质有明显差异的4种材料分区,采用钥匙孔(Key Hole)模型准确模拟裂纹张开过程中裂纹尖端的钝化行为,研究了拉伸载荷作用下根焊内表面周向裂纹的起裂行为。计算结果表明:对于双V形坡口焊接接头,根焊材料强度对焊接接头整体应变能力影响很小,可以忽略不计;填充焊材料与母材强度的高强匹配对保证焊缝区应变能力最为重要,在难以提高填充焊材料强度的情况下,限定母材的强度指标是提高高钢级管道焊接接头应变能力的有效方法。(图7,表1,参25)
In order to evaluate the influence of the strength of base material, root welding material and filler material on the strain capacity of girth welds in X80 pipeline, the passivation behavior of crack tips during cracking was accurately simulated with the Key Hole model by the nonlinear finite element method based on the China–Russia Eastern Gas Pipeline with a diameter of 1 422 mm and a wall thickness of 21.4 mm. Here, consideration was given to the complete geometrical morphology of welded joints and the partition of four materials with different properties. In addition, the crack initiation behavior of circumferential cracks in the root inner surface under the action of tensile load was researched. According to the results, the strength of root welding material has little impact on the overall strain capacity of double V-groove welded joint, which can be ignored. The overmatching of filler material with the base material is the most important to guarantee the strain capacity in the weld zone. Moreover, in the case that it is difficult to enhance the strength of filler material, limiting the strength indicator of base material is an effective way to improve the strain capacity of welded joints in high-grade steel pipelines.(7 Figures, 1 Table, 25 References)
作者
杨悦
张宏
刘啸奔
吴锴
隋永莉
杨叠
YANG Yue;ZHANG Hong;LIU Xiaoben;WU Kai;SUI Yongli;YANG Die(College of Mechanical and Transportation Engineering,China University of Petroleum(Beijing)//National EngineeringLaboratory for Pipeline Safety//MOE Key Laboratory of Petroleum Engineering//Beijing Key Laboratory of Urban Oil andGas Distribution Technology;China Petroleum Pipeline Research Institute Co.Ltd.//National Engineering Laboratory forPipeline Safety)
出处
《油气储运》
CAS
北大核心
2022年第1期48-54,共7页
Oil & Gas Storage and Transportation
基金
国家自然科学基金资助项目“逆断层作用下X80管道屈曲演化与韧性破损机理研究”,52004314
新疆自治区天山青年计划项目“复杂载荷作用下高钢级管道韧性断裂与后屈曲失效行为”,2019Q088
北京市自然科学基金资助项目“时变温压荷载作用下大口径直埋热水管道-土体耦合机制与失效机理研究”,8214053
深水油气管线关键技术与装备北京市重点实验室开放课题资助项目“断层作用下碳纤维增强海底管道的力学响应与失效机理研究”,BIPT2020005
中国石油大学(北京)青年拔尖人才科研基金资助项目“断层作用下高强钢管道失效机理与可靠性评价”,2462018YJRC019
中国石油大学(北京)科研基金资助项目“基于大数据的天然气管网智能运行与控制研究”,2462020YXZZ045。
关键词
X80管道
环焊缝
根焊裂纹
有限元
临界应变
裂纹驱动力
X80 pipeline
girth welds
root welding crack
finite element
critical strain
crack driving force
