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Abstract <p>As requested in industry standards and the executable technical documents XX, the fatigue performance of weld bead needs to be assessed during the assessment and verification procedure for self-made pipeline components. The document stated that 5% decrease in resonance frequency indicates cracks appear in the pipeline components based on failure criterion. It was difficult to detect cracks on the pipeline typical components with naked eyes after the experiment. More proof was needed to confirm that the frequency decreasing was directly related to fatigue cracks, and the crack appeared at the expected position. Therefore, fatigue performance assessment was conducted on a batch of pipeline components, and the failed test pipeline was further analyzed. In the present work, three perspectives, including structural simulation analysis, experimental verification, and microscopic fracture observation of 1Cr18Ni9Ti stainless steel pipeline components, were investigated. It&#xa0;was demonstrated that the cracks were caused by fatigue vibration in a new perspective, and which verified the effectiveness of the technical implementation documents. By the fracture surface analysis, the characteristics of crack propagation alonged the grain boundaries and the propagation of secondary cracks were demonstrated, and the influence of the inhomogeneity of the microstructure in the welding area on the crack propagation path was revealed.</p>

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Fatigue Test in Aviation Pipelines Typical Components and Minor Cracks Analysis

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • Lin-Feng Li,
  • Zhi-Peng Shi,
  • Tai-Li Chen,
  • An-Yong Qing,
  • Hai-Yang Ma,
  • Yi Wang,
  • Jiu-Lin Xiao

摘要

Abstract

As requested in industry standards and the executable technical documents XX, the fatigue performance of weld bead needs to be assessed during the assessment and verification procedure for self-made pipeline components. The document stated that 5% decrease in resonance frequency indicates cracks appear in the pipeline components based on failure criterion. It was difficult to detect cracks on the pipeline typical components with naked eyes after the experiment. More proof was needed to confirm that the frequency decreasing was directly related to fatigue cracks, and the crack appeared at the expected position. Therefore, fatigue performance assessment was conducted on a batch of pipeline components, and the failed test pipeline was further analyzed. In the present work, three perspectives, including structural simulation analysis, experimental verification, and microscopic fracture observation of 1Cr18Ni9Ti stainless steel pipeline components, were investigated. It was demonstrated that the cracks were caused by fatigue vibration in a new perspective, and which verified the effectiveness of the technical implementation documents. By the fracture surface analysis, the characteristics of crack propagation alonged the grain boundaries and the propagation of secondary cracks were demonstrated, and the influence of the inhomogeneity of the microstructure in the welding area on the crack propagation path was revealed.