电焊机2025，Vol.55Issue(4)：8-15,8.DOI:10.7512/j.issn.1001-2303.2025.04.02
基于GTN模型的X80管线钢环焊缝参数标定及断裂行为研究
Research on the Calibration of Parameters and Fracture Behavior of X80 Pipeline Steel based on GTN Model at the Circular Weld Seam of Pipe
李元 1潘婷 2李安 1孙巧飞 3刘攀 1余志峰4
作者信息
- 1. 国家石油天然气管网集团有限公司 建设项目管理分公司,河北 廊坊 065000
- 2. 中国石油天然气管道科学研究院有限公司,河北 廊坊 065000
- 3. 国家管网集团科学技术研究总院分公司,河北 廊坊 065000
- 4. 中国石油天然气管道工程有限公司,河北 廊坊 065000
- 折叠
摘要
Abstract
The classical Gurson-Tvergaard-Needleman(GTN)damage model is established based on the pore expansion fail-ure model dominated by high stress triaxiality,but the GTN model is not sensitive to the failure behavior dominated by shear action under low stress triaxiality.Four different notch shapes of tensile specimens were designed to simulate the material be-havior under different stress triaxialities.The ABAQUS finite element software was used for numerical simulation,and the GTN model parameters were calibrated through the inverse calibration method,and the mesh was locally refined in the notch fracture area to accurately simulate crack propagation.Through multiple iterations,the GTN parameters of X80 pipe-line steel base material and its welds with different matching degrees were successfully calibrated.The study found that the main parameters affecting the nonlinear response of ductile materials include the Tvergaard coefficient,initial porosity,and nucleated pore volume fraction.The porosity parameters and nucleation function parameters of the weld metal are signifi-cantly different from those of the base material,indicating that the same set of parameters cannot be directly used for the ductile fracture simulation of pipeline ring welds.Combining the finite element numerical simulation and the inverse calibra-tion method,the GTN model parameters applicable to X80 pipeline steel ring weld joints were successfully calibrated.This provides a basis for more accurate simulation of the fracture behavior of pipeline ring welds.Future research should further optimize the GTN model,considering the dependence of plastic state variables,to establish a fully coupled plastic constitutive-driven damage constitutive.关键词
GTN损伤模型/多孔成核损伤/损伤力学/X80管线钢/有限元分析Key words
GTN damage model/void nucleation damage/damage mechanics/X80 pipeline steel/finite element analysis分类
金属材料引用本文复制引用
李元,潘婷,李安,孙巧飞,刘攀,余志峰..基于GTN模型的X80管线钢环焊缝参数标定及断裂行为研究[J].电焊机,2025,55(4):8-15,8.
