压力管道对接焊缝焊趾应力集中研究  

Research on Stress Concentration at the Toe of Butt Welds inPressure Pipelines

作　　者：封小亮 马括 刘课秀 FENG Xiaoiang;MA Kuo;LIU Kexiu(Guangzhou Special Pressure Equipment Inspection and Research Institution,510000,Guangzhou,PRC)

机构地区：[1]广州特种承压设备检测研究院,广州510000

出　　处：《江西科学》2024年第4期809-812,875,共5页Jiangxi Science

基　　金：广东省市场监督管理局科技项目(2021CT06,2023CT11)。

摘　　要：国标GB/T 19624—2019环焊缝平面缺陷的安全评价主要考虑轴向膜应力与弯曲应力之和,并未考虑焊缝应力集中效应对膜应力的影响行为。基于ASME VIII焊缝疲劳的结构应力分析方法,采用ABAQUS分析了14 mm板厚的焊缝余高h、焊缝宽度b等对对接焊缝应力集中的影响规律。结果表明,当宽度b一定,焊缝结构应力集中系数K_(m)值随余高h增加而增大,当余高h到达一定值后,K_(m)值基本恒定,此时K_(m)值最大值取决于宽度b,并据此提出了在特定余高h及宽度b区间内K_(m)与宽度b之间函数关系式K_(m)=0.97+0.021b,研究内容对于含缺陷压力管道安全评价和对接焊缝的疲劳分析具有重要工程指导价值。The safety assessment of planar defects in circumferential welds in the standard GB/T 19624—2019 mainly considers the sum of axial membrane stress and bending stress,but does not consider the influence of stress concentration effect on film stress.This paper is based on the struc-tural stress analysis method of ASME VIII weld fatigue.The influence of seam residual height h and seam width b of 14 mm plate thickness on the stress concentration of butt weld was analyzed by ABAQUS.The results show that when the width b is constant,the stress concentration coefficient K_(m) of the weld structure increases with an increase of the residual height h.When the residual height h reaches a certain value,the K_(m) value basically remains constant,and the maximal of the K_(m) value depends on the width b.Consequently,the functional relationship between K_(m) and width b within a specific residual height h and width b is proposed,as K_(m)=0.97+0.021b.The research content has important engineering guiding value for the safety evaluation of pressure pipelines with defects and fatigue analysis of butt weld.

关 键 词：安全评价 膜应力 对接焊缝 结构应力 

分 类 号：TG441[金属学及工艺—焊接]