Many achievements have been made in the field of fatigue damage detection of butt welds by metal magnetic memory detection technology, but the current research mainly focuses on pull-pressing fatigue failure of butt welds. It is different from the bending-tensile fatigue failure of welds in actual structures. For this purpose, the steel I-beam with butt weld was used to perform fatigue experiments, in order to more realistically simulate the fatigue-cracking process of butt weld in actual engineering, and reveal the changing laws of magnetic signals during the fatigue process. The experiment results show that the change trend of the magnetic signal distribution curve is influenced by the initial welded state of the weld. When the initial magnetic signal curve distribution trend of the same weld is similar, the variation trend of the peak and valley values with the fatigue cycle is also basically same.The appearance of macroscopic fatigue cracks can be expressed as the sudden change of the magnetic signal distribution curve, but the normal component of the magnetic signal is more sensitive to the accumulation of fatigue damage during the stable fatigue stage. The change process of weld fatigue can be characterized as the variation of the normalized vector composite magnetic signal average characteristic curve and the generalized time node of fatigue crack initiation can be captured. So the appearance of macro fatigue cracks can be warned.
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和振峰,周建庭,马虎,等. 基于金属磁记忆的钢结构焊缝疲劳试验[J]. 科学技术与工程, 2021, 21(18): 7762-7769. He Zhenfeng, Zhou Jianting, Ma Hu, et al. Fatigue Experiment of Steel Structure Weld Based on Metal Magnetic Memory[J]. Science Technology and Engineering,2021,21(18):7762-7769.