Stress-magnetic Effect of Bridge Cable Wire and Steel Under Tensile Load
HE Junfeng1, JIANG Shenghua1,2,*, SUN Weihe1, WANG Lianqiang1
1 College of Engineering and Technology, Southwest University, Chongqing 400715, China 2 School of Civil Engineering, Wuhan University, Wuhan 430072, China
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 By and magnetic gradient Byz 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 By and Byz decreased for most measuring points. The relationship between the mean of the absolute values of By and Byz and stress is reversed when stress is 175.9 MPa, which is smaller than the yield strength (584.3 MPa). The By and Byz 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 By and Byz of steel and stress, which may be used as a reference for magnetic monitoring of stress in cable wire and steel stress.
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2023, Vol. 37 
