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<p>A&#xa0;modified method for assessing the technical state of defective pipes in long-term operated main gas pipelines is proposed, based on the analysis of degradation changes in 10G2BT and 17GS structural steels after more than 30&#xa0;years of operation. The results of determining the mechanical characteristics of steels, fracture toughness, and residual hydrogen concentration are presented. It is established that the accumulation of microdamage in the pipe wall decreases strength, plasticity, and fracture toughness of the material, which significantly increases the risk of the pipeline’s sudden fracture. The results of experimental and computational studies characterizing the fracture conditions under which a&#xa0;crack-like defect spontaneously develops are obtained. The method integrates the linear and nonlinear fracture mechanics approaches, which include the <i>J</i>-integral method sensitive to operational factors, and considers the geometry of defects.</p>

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Development of fracture mechanics approaches for assessing the state of long-term operated defective pipes of main gas pipelines

  • 期刊论文

  • 发表日期：

    2025年11月12日

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  • Ye. I. Kryzhanivskyi,
  • R. S. Hrabovskyy,
  • O. M. Tuts,
  • O. M. Mandryk,
  • V. B. Zapukhliak,
  • I. M. Fartushok

摘要

A modified method for assessing the technical state of defective pipes in long-term operated main gas pipelines is proposed, based on the analysis of degradation changes in 10G2BT and 17GS structural steels after more than 30 years of operation. The results of determining the mechanical characteristics of steels, fracture toughness, and residual hydrogen concentration are presented. It is established that the accumulation of microdamage in the pipe wall decreases strength, plasticity, and fracture toughness of the material, which significantly increases the risk of the pipeline’s sudden fracture. The results of experimental and computational studies characterizing the fracture conditions under which a crack-like defect spontaneously develops are obtained. The method integrates the linear and nonlinear fracture mechanics approaches, which include the J-integral method sensitive to operational factors, and considers the geometry of defects.