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Lookup NU author(s): Professor Gui Yun TianORCiD,
Dr Bin Gao
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
© 2017 Stress measurement that provides early indication of stress status has become increasingly demanding in the field of Non-destructive testing and evaluation (NDT&E). Bridging the correlation between micro magnetic properties and the applied tensile stress is the first conceptual step to come up with a new method of non-destructive testing. This study investigates the characterization of applied tensile stress with in-situ magnetic domain imaging and their dynamic behaviors by using magneto-optical Kerr effect (MOKE) microscopy assisted with magneto-optical indicator film (MOIF). Threshold magnetic field (TMF) feature to reflect 180° domain wall (DW) characteristics behaviors in different grains is proposed for stress detection. It is verified that TMF is a threshold feature with better sensitivity and brings linear correlation for stress characterization in comparison to classical coercive field, remanent magnetization, hysteresis loss and permeability parameters. The results indicate that 180° DWs dynamic in the inner grain is highly correlated with stress. The DW dynamics of turn over (TO) tests for different grains is studied to illustrate the repeatability of TMF. Experimental tests of high permeability grain oriented (HGO) electrical steels under stress loading have been conducted to verify this study.
Author(s): Qiu F, Ren W, Tian GY, Gao B
Publication type: Article
Publication status: Published
Journal: Journal of Magnetism and Magnetic Materials
Print publication date: 15/06/2017
Online publication date: 03/02/2016
Acceptance date: 30/01/2017
Date deposited: 26/04/2017
ISSN (print): 0304-8853
ISSN (electronic): 1873-4766
Publisher: Elsevier B.V.
Data Access Statement: http://dx.doi.org/10.17634/072976-1
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