Variation of coercivity of ferromagnetic material during cyclic stressing

Author

Gao, Z. ; Chen, Z.J. ; Jiles, D.C. ; Biner, S.

Author_Institution

Ames Lab., Iowa State Univ., Ames, IA, USA

Volume

30

Issue

6

fYear

1994

fDate

11/1/1994 12:00:00 AM

Firstpage

4593

Lastpage

4595

Abstract

The relationship between coercivity and the number of stress cycles is reported in this paper. The linear relation between coercivity and the logarithm of the number of stress cycles was confirmed in load controlled fatigue tests, for both pre-strained and unprestrained specimens. It is believed that the dislocation activity is the main factor changing the magnetic properties of a ferromagnetic material under fatigue, rather than other microstructures and internal stress. As a result, a theoretical model was developed to explain the correlation between the coercivity and the number of stress cycles. The model is based on domain wall dislocation interaction and the strain-dislocation relation. We predict the relation between magnetic properties and the stage of fatigue life as Hc-Hc₀=b ln(N), where Hc-Hc₀ is the change in coercivity, N is the number of stress cycles and b is a constant

Keywords

coercive force; dislocations; fatigue; fatigue testing; ferromagnetic materials; magnetic domains; magnetomechanical effects; steel; coercivity; cyclic stressing; dislocation activity; domain wall dislocation interaction; fatigue life; ferromagnetic material; load controlled fatigue tests; strain-dislocation relation; Coercive force; Fatigue; Magnetic domain walls; Magnetic materials; Magnetic properties; Magnetic separation; Saturation magnetization; Steel; Stress; Testing;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.334159

Filename

334159