A Physical Model for Self-emitting Magnetic Signals during Fatigue Crack Propagation

摘要：

　　It has previously been reported that when a fatigue crack grows in ferromagnetic materials, abnormal magnetic signals are spontaneously emitted, which can provide a powerful tool for fatigue crack life prediction.However, there is no physical model yet available to explain the mechanism for the formation of these self-emitting magnetic signals.In the present research, tension-tension fatigue tests of center-cracked sheet specimens were performed.The variations in the normal component of the self-emitting magnetic signals, Hp(y), on the surfaces of the specimens were measured during the fatigue test.The differences in peak-to-peak value, Hp(y), before and after failure of a specimen, were characterized.Consequently, a physical model based on magnetic charge was proposed, which was in good agreement with the experimental results.The model is helpful for understanding the inherent mechanism of the self-emitting magnetic signals.

关键词： ferromagnetic materials fatigue crack self-emitting magnetic signals peak-to-peak value magnetic charge

作者: Dong Li-hong Xu Bin-shi Wang Hui-peng Xue Nan

作者单位: Science and Technology on Remanufacturing Laboratory,Beijing 100072,China

会议类型: 国际会议

会议名称: the 3nd International Conference on Digital Manufacturing & Automation (第三届数字制造与自动化国际会议(ICDMA 2012))

会议地点: 桂林

会议语种:英文

页码: 415-418

在线出版日期: 2012-08-01（万方平台首次上网日期，不代表论文的发表时间）