拉伸荷载作用下桥梁拉索钢丝/钢筋的力-磁效应研究

doi:10.11896/cldb.21120159

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Abstract The current research on the stress-magnetic effect and reversal effect on cable wire and steel during the entire elastoplastic process under tensile load is limited. Moreover, the existing test method is influenced by environmental interference magnetic fields, which significantly affect the accuracy of the magnetic field-based test. The nonmagnetic experimental method is developed for the magnetic testing of stress in cable wire and steel under tensile load. Experiment and finite element analysis (FEA) are used to investigate the relationship between the steel's magnetic field intensity, magnetic gradient, and stress during the entire elastoplastic tension process. When the stress was smaller than 175.9 MPa, the change in the magnetic domain was dominated by wall shifts. As the stress increased, the magnetic permeability of the steel bar increased, and the absolute values of the magnetic field intensity B_y and magnetic gradient B_yz increased for most measuring points. When the stress was greater than 175.9 MPa (before fracture), the change in the magnetic domain was dominated by rotation. As the stress or strain increased, the magnetic permeability of the steel bar decreased, and the absolute values of B_y and B_yz decreased for most measuring points. The relationship between the mean of the absolute values of B_y and B_yz and stress is reversed when stress is 175.9 MPa, which is smaller than the yield strength (584.3 MPa). The B_y and B_yz values of steel calculated by FEA are relatively consistent with the experimental results. During the entire elastoplastic procedure under tensile load, experimental values, calculated values by FEA, and fitted values were very similar in terms of the relationship between the mean of the absolute values of B_y and B_yz of steel and stress, which may be used as a reference for magnetic monitoring of stress in cable wire and steel stress.

Key words： cable wire steel stress-magnetic effect magnetic field intensity magnetic gradient

Published: Online: 2023-07-10

CLC number:	TH140.7
	TG115.28

Fund:National Natural Science Foundation of China(51208078), Chongqing Technology Innovation and Application Demonstration Social Livelihood Projects (cstc2018jscx-msybX0028), China Postdoctoral Science Foundation (2017M622977), and Chongqing Postdoctoral Research Project Special Funding(XmT2018028).

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	HE Junfeng
	JIANG Shenghua
	SUN Weihe
	WANG Lianqiang

Cite this article:

HE Junfeng,JIANG Shenghua,SUN Weihe, et al. Stress-magnetic Effect of Bridge Cable Wire and Steel Under Tensile Load[J]. Materials Reports, 2023, 37(13): 21120159-8.

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http://www.mater-rep.com/EN/10.11896/cldb.21120159 OR http://www.mater-rep.com/EN/Y2023/V37/I13/21120159

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