管座角焊缝接头D-N疲劳曲线试验研究  

Study on Experiment of D-N Fatigue Curve of Fillet Weld Joint of Pipe Seat

作　　者：杨超[1] 张亚军[2,3] YANG Chao;ZHANG Yajun(Jiangsu Frontier Electric Technology Co.Ltd.,Nanjing 211102,China;Luoyang Ship Material Research Institute,Luoyang 471023,China;Henan Key Laboratory of Technology and Application of Structural Materials for Ships and Marine Equipments,Luoyang 471023,China)

机构地区：[1]江苏方天电力技术有限公司,江苏南京211100 [2]中国船舶重工集团公司第七二五研究所,河南洛阳471023 [3]河南省船舶及海工装备结构材料技术与应用重点实验室,河南洛阳471023

出　　处：《材料开发与应用》2021年第1期77-82,共6页Development and Application of Materials

摘　　要：锅炉大直径厚壁管与小径管的管座角焊缝焊接接头常常因受疲劳作用而发生失效,这种疲劳导致的失效多数是由于小载荷、长力臂产生的弯曲应力反复作用造成的。基于锅炉承压部件管接头的特征及其服役背景,设计了模拟焊接接头试样,采用悬臂弯曲加载方式,通过成组试验方法,研究了锅炉管座角焊缝焊接接头的位移-寿命曲线(即D-N曲线)。结果表明:锅炉管座角焊缝焊接接头的D-N曲线可以用来对其进行疲劳有限寿命设计,D-N数据分布可以用幂函数规律进行表达。The weld joint of large diameter thick wall tube and small diameter tube of boiler always fails in view of fatigue action,and this failure mostly hails from periodic bending stress by small load and long lever arm.In this paper,based on characteristics and service condition of the pipe joint of pressure parts of the boiler,the specimen was designed.By cantilever bend loading mode,displacement-life curve of the fillet weld joint of pipe seat for the boiler,namely D-N curve,were studied by group-method.The results manifested that D-N curve could be used for finite life design of the fillet weld joint of pipe seat for the boiler and D-N data distribution could be expressed by power function rule,which would provide reference for assessment of fatigue life of the fillet weld joint of pipe seat for the boiler.

关 键 词：管座 角焊缝焊接接头 位移-寿命曲线 试验 

分 类 号：TG115.57[金属学及工艺—物理冶金]