Evaluation of Softening Zone in X80 Pipeline Steels under Tension-bending Load

2nd International Conference on Manufacturing Technologies

Ligang, Liu^1 ; Chaofan, Zhang^1 ; Yu, Liu^2 ; Shumao, Sun^1 ; Hui, Yu^1

College of Mechanical Engineering, Yanshan University, Qinhuangdao

066004, China^1

China Petroleum Pipeline Research Institute, Langfang

065000, China^2

关键词: ABAQUS software;    Design coefficient;    Finite element analysis model;    Service performance;    Softening zone;    Strain capacities;    Structural instability;    X80 pipeline steels;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/398/1/012035/pdf
DOI  :  10.1088/1757-899X/398/1/012035

来源: IOP

【 摘 要 】

Softening of heat-affected zone of X80 pipeline steel is common in weld joints. The finite element analysis model was established based on ABAQUS software in this paper, then the numerical simulation of the strain capacity of X80 steel pipe was carried out under tension-bending load. Researches show that the softening zone width has little influence on service performance of the pipelines under tension-bending load. When the softening rates are 5%, 10% and 15%, the peak values of load are similar. However, structural instability of the pipeline with softening rate 15% is worse and more serious. The pipeline with design coefficient of 0 can withstand greater deformation under tension-bending load, and it can keep good performance.