Characteristics of Magnetic Memory Signals During Real-Time Fatigue Testing of Steel Plates
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摘要: 为尽早获取疲劳损伤异常信号,以便对在役桥梁钢结构的疲劳状态进行快速评估,需要不断深入探索可识别疲劳损伤特征的新方法。针对钢桥用钢板,开展疲劳实时样本的磁记忆信号测量研究,得到试件疲劳过程的磁记忆信号变化规律。研究表明:钢板周边环境不变时,疲劳过程中的信号曲线分布具有相似和衔接的规律;单个探头磁记忆信号测量的识别范围可达40 mm;磁记忆强度和梯度测量对垂直于裂纹方向的信号具有很强的识别性;当钢板发生疲劳裂纹时,磁记忆强度和梯度均能呈现明显的信号特征,其中强度信号具有极值和过零点特征,梯度信号呈M和∧形特征。鉴于试验研究的试件数量有限,随疲劳次数增加钢板磁记忆信号的变化趋势暂不明显。下一步需要积累大量数据,扩充至足够的数据样本,并研究获取其变化趋势的有效方法。Abstract: In order to obtain fatigue damage characteristics as early as possible and to quickly evaluate the fatigue state of in-service bridge steel structures, it is necessary to explore new methods for identifying fatigue damage characteristics. Magnetic memory signals were measured on real-time fatigue samples of steel plates used in steel bridges, and the evolution of the signals during the fatigue process was obtained. The results showed that, under constant ambient conditions, the distribution of the signal curves exhibited similarity and successive evolution during the fatigue process. The identification range of a single probe in the magnetic memory signal measurement reached 40 mm. Additionally, the magnetic memory signal strength and its slope provided strong identification capability when the measurement direction was perpendicular to the crack orientation. When fatigue cracks developed in the steel plate, the magnetic memory strength signals and their slope signals showed distinct curve characteristics. Specifically, the strength signals showed extreme values and a zero-crossing point, while the slope signals presented M-shaped and ∧-shaped patterns. Due to the limited number of specimens in this experimental study, the trend of magnetic memory signals with the increase of fatigue cycles was not yet obvious. Future work should focus on accumulating a larger dataset, expanding to a sufficient number of samples, and exploring more effective methods to obtain the evolving trends.
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