Effect of External Field on the Variation of Magnetic Memory Signals

Effect of External Field on the Variation of Magnetic Memory Signals

Zhongchao QIU Weimin ZHANG Yan GUO Feng QIN Mingming YUE 

School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China

Corresponding Author Email: 
448347664@163.com; zhangwmbit@gmail.com; xingyunxiaomimi@gmail.com; xiaofengfeng0717@126.com; yuemm20120110@126.com
30 September 2014
| Citation



Tensile-tensile fatigue tests of 16MnR steel sheet specimens with prefabricated flaws were carried out to measure spontaneous stray field signals of stress concentration zones by GMR sensor, and excitation device was used to make external field excitation for sheet specimens. The results showed that the tangential component of stray field signals can still be considered as generalized magnetic memory signals when tests were conducted in external field without load. Magnetic memory signals were strengthened due to external magnetic excitation, improving sensitivity of detection system. The tangential component of stray field signals presented the maximum value at the stress concentration zones, which increased as cycle number increase, and the growth rate isn’t identical in different stages of fatigue damage.


metal magnetic memory; external field; stress concentration zone; 16MnR steel

1. Introduction
2. The Sensitivity Analysis of Detection System
3. Experiment
4. Experimental Results and Analysis
5. Conclusions

We would like to thank all the referees for their valuable comments in improving this paper. This research is supported by The Foundation of National Nature Science of China (Grant no.51275048)


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