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<p>Metal Magnetic Memory (MMM) technology is an effective non-destructive method for detecting the early fatigue damage in steel structures. Since loading conditions strongly influence magnetic signal, this study investigates how three parameters (load amplitude, load ratio, and load peak value) affect magnetic field evolution during fatigue. Magnetic measurements are conducted on welded specimens subjected to three-point bending. The results show that magnetic intensity changes significantly as the load rises from low to high levels, while the spatial distribution remains nearly unchanged. In contrast, load reduction produces smaller variations in the magnetic response. A Bayesian hierarchical model was established to quantify the influence of each parameter. The results indicate that load peak and load amplitude exert more pronounced and consistent effects, whereas load ratio has a comparatively minor impact. A probability-based ranking analysis further confirms the following order of influence: load peak, load amplitude, and load ratio.</p>

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Analysis of Load Parameter Effects on Magnetic Field Evolution in Fatigued Steel Welds

  • 期刊论文

  • 发表日期：

    2026年3月24日

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  • Zhenfeng He,
  • Kai Tong,
  • Tianyu Hu,
  • Hong Zhang,
  • Shike Zhang

摘要

Metal Magnetic Memory (MMM) technology is an effective non-destructive method for detecting the early fatigue damage in steel structures. Since loading conditions strongly influence magnetic signal, this study investigates how three parameters (load amplitude, load ratio, and load peak value) affect magnetic field evolution during fatigue. Magnetic measurements are conducted on welded specimens subjected to three-point bending. The results show that magnetic intensity changes significantly as the load rises from low to high levels, while the spatial distribution remains nearly unchanged. In contrast, load reduction produces smaller variations in the magnetic response. A Bayesian hierarchical model was established to quantify the influence of each parameter. The results indicate that load peak and load amplitude exert more pronounced and consistent effects, whereas load ratio has a comparatively minor impact. A probability-based ranking analysis further confirms the following order of influence: load peak, load amplitude, and load ratio.