Research on the Calibration of Parameters and Fracture Behavior of X80 Pipeline Steel based on GTN Model at the Circular Weld Seam of Pipe

LI Yuan; PAN Ting; LI An; SUN Qiaofei; LIU Pan; YU Zhifeng

doi:10.7512/j.issn.1001-2303.2025.04.02

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Research on the Calibration of Parameters and Fracture Behavior of X80 Pipeline Steel based on GTN Model at the Circular Weld Seam of Pipe
Vol. 55, Issue 4, Pages: 8-15(2025)
Received：21 November 2024，

Revised：2025-01-19，

Published：20 April 2025
DOI： 10.7512/j.issn.1001-2303.2025.04.02
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李元，潘婷，李安，等.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. DOI： 10.7512/j.issn.1001-2303.2025.04.02.

LI Yuan, PAN Ting, LI An, et al.Research on the Calibration of Parameters and Fracture Behavior of X80 Pipeline Steel based on GTN Model at the Circular Weld Seam of Pipe[J].Electric Welding Machine, 2025, 55(4): 8-15. DOI： 10.7512/j.issn.1001-2303.2025.04.02.

摘要

经典Gurson-Tvergaard-Needleman（GTN）损伤模型是建立在由高应力三轴度主导的孔隙扩张失效模型，但GTN模型捕捉对剪切作用主导的低应力三轴度失效行为并不敏感。设计了四种不同缺口形状的拉伸试样，以模拟不同应力三轴度下的材料行为。采用ABAQUS有限元软件进行数值模拟，通过反向标定方法标定GTN模型参数，并在缺口断裂区域进行网格局部加密，以精确模拟裂纹扩展。通过多次迭代，成功标定了X80管线钢母材及其不同匹配程度焊缝的GTN参数。研究发现，影响韧性材料非线性响应的主要参数包括Tvergaard系数、初始孔隙率和成核孔隙体积分数。焊缝金属的孔隙度参数和形核函数参数与母材存在显著差异，表明不能直接采用同一组参数进行管道环焊缝的韧性断裂模拟。结合有限元数值模拟仿真采用反向标定方法，成功标定了适用于X80管线钢环焊缝接头的GTN模型参数。这为更准确地模拟管道环焊缝的断裂行为提供了依据。未来的研究方向应进一步优化GTN模型，考虑塑性状态变量的依赖性，以建立完全耦合的塑性本构驱动的损伤本构。

Abstract

The classical Gurson-Tvergaard-Needleman (GTN) damage model is established based on the pore expansion failure 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 behavior 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 pipeline 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 significantly 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 calibration 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

Keywords

references

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