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The J-integral with a path surrounding the tip of crack exhibits the characteristics of the strain field within elastic or elastic–plastic area and thus can be utilized for assessing the structural integrity of components containing flaws. An enhanced J-integral estimate technique is presented in this study for pipelines with circumferential semi-elliptical surface cracks subjected to tensile load, global bending and internal pressure. In particular, 18 cracked models are created using the three-dimensional finite element analysis method to confirm the validity of the boundary conditions and load application of the finite element model, taking into account the effects of integral radius and number of grid layers included in the integral paths on the simulation results. Subsequently, 54 models are established to estimate the stress intensity factor for pipe radius-to-thickness ratios less than 5, which reasonably expanded the scope of application of the shape factor. Therefore, this approach may be employed to analyze the fracture of pipelines with varying pipe radius-to-thickness ratio of circumferential semi-elliptical fractures.

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Studies on J-Integral Estimation of Pipeline with Circumferential Surface Crack Based on Finite Element Analysis

  • 会议论文

  • 发表日期：

    2026年

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  • Yingke Li,
  • Xiaomin Tan,
  • Yuhan Wang,
  • Jun Pan,
  • Zhangxing Chen,
  • Chang Liu,
  • Xihui Su

摘要

The J-integral with a path surrounding the tip of crack exhibits the characteristics of the strain field within elastic or elastic–plastic area and thus can be utilized for assessing the structural integrity of components containing flaws. An enhanced J-integral estimate technique is presented in this study for pipelines with circumferential semi-elliptical surface cracks subjected to tensile load, global bending and internal pressure. In particular, 18 cracked models are created using the three-dimensional finite element analysis method to confirm the validity of the boundary conditions and load application of the finite element model, taking into account the effects of integral radius and number of grid layers included in the integral paths on the simulation results. Subsequently, 54 models are established to estimate the stress intensity factor for pipe radius-to-thickness ratios less than 5, which reasonably expanded the scope of application of the shape factor. Therefore, this approach may be employed to analyze the fracture of pipelines with varying pipe radius-to-thickness ratio of circumferential semi-elliptical fractures.