Magnetic charge model for 3D MMM signals

Abstract

Stress concentration is a major cause of metal structure failures. Based on the metal magnetic memory (MMM) technique, detailed information of stress concentration or defects on ferromagnetic materials can be obtained from the changed magnetic signals. The magnetic charge model of MMM signal is described, and simulations based on this model are performed for a sample with stress-concentration zone or a long elliptical defect. Some basic characteristics produced by present model are coincident with existed experimental measurements. The agreements between simulations and experimental results confirm that the present magnetic charge model can be used as an MMM signal forward technique.

Keywords:

• ferromagnetic materials
• metal magnetic memory
• magnetic charge model
• stress-concentration zone
• long elliptical defect

Acknowledgements

This research was supported by the Fund of the National Natural Science Foundation of China (No. 11472201), the Fundamental Research Funds for the Central Universities (No. JB142001-2), and the Open Research Fund of Key Laboratory of Mechanics on Disaster and Environment in Western China (No. Klmwde201406). The authors gratefully acknowledge these supports.

Disclosure statement

No potential conflict of interest was reported by the authors.