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Advances in Materials Science and Engineering
Volume 2017, Article ID 1284560, 8 pages
https://doi.org/10.1155/2017/1284560
Research Article

The Magnetic Memory Effect of Ferromagnetic Materials in the Process of Stress-Magnetism Coupling

School of Mechanical Engineering, Liaoning Shihua University, Liaoning Province 113001, China

Correspondence should be addressed to Guoqing Wang; nc.ude.upnl@gniqouggnaw

Received 24 April 2017; Accepted 16 July 2017; Published 14 August 2017

Academic Editor: Michele Zappalorto

Copyright © 2017 Guoqing Wang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Ferromagnetic materials can produce the magnetic memory effect under stress. This provides a practical method to measure stress concentration. The relation between stress and magnetic characteristic is analyzed through energy balance theory. Force-magnetism coupling process of Fe-C crystal system is simulated by CASTEP software which is based on first principle. Electron band structure, electron density of states, and atomic magnetic moment in the process of force-magnetism coupling process are calculated. Experimental investigation of the magnetic memory effect of ferromagnetic material under different stresses has been undertaken in X52 pipeline. The results show that the magnetic characteristic of ferromagnetic material weakens under stress, and the magnetic memory signals intensity linearly decreases with the increasing stress. When material yields, the variation character of magnetic memory signals suddenly changes and the inflection points of the stress-B curves emerge. Experimental investigation is in agreement with the theoretical analysis.