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<p>As critical sealing components in well control equipment, the preload uniformity of flange bolt connections significantly influences the reliability of metal seals under high-pressure dynamic service conditions. However, non-uniform stress distributions in bolt groups caused by complex external loads can compromise sealing contact stress, thereby affecting the sealing performance. Existing detection methods have difficulties in accurately characterizing bolt stress states under coupled complex loads such as eccentric loading. This paper develops a combined magnetic-acoustic bolt stress detection system based on magnetic stress measurement and acoustoelastic effects. Laboratory experiments were conducted to validate an integrated methodology for identifying complex bolt stress states. Field tests under eccentric loading conditions show that the relative error between magnetic and acoustic axial stress measurements is below 6%. Under non-uniform preload and bending loads, magnetic stress measurements were used to identify linear axial stress evolution during elastic-stage pressurization, stress variation disparities, and tensile-compressive stress asymmetry on individual bolts.</p>

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Research on Magneto-Acoustic Combined Stress Detection of Flange Connection Bolts Under Eccentric Loading Conditions

  • 期刊论文

  • 发表日期：

    2025年12月29日

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  • Yanran Wang,
  • Xumeng Xie,
  • Qingshan Li,
  • Wenjie Pan,
  • Zhaozhao Bai

摘要

As critical sealing components in well control equipment, the preload uniformity of flange bolt connections significantly influences the reliability of metal seals under high-pressure dynamic service conditions. However, non-uniform stress distributions in bolt groups caused by complex external loads can compromise sealing contact stress, thereby affecting the sealing performance. Existing detection methods have difficulties in accurately characterizing bolt stress states under coupled complex loads such as eccentric loading. This paper develops a combined magnetic-acoustic bolt stress detection system based on magnetic stress measurement and acoustoelastic effects. Laboratory experiments were conducted to validate an integrated methodology for identifying complex bolt stress states. Field tests under eccentric loading conditions show that the relative error between magnetic and acoustic axial stress measurements is below 6%. Under non-uniform preload and bending loads, magnetic stress measurements were used to identify linear axial stress evolution during elastic-stage pressurization, stress variation disparities, and tensile-compressive stress asymmetry on individual bolts.