Magneto-Mechanical Effect and Numerical Simulation Method for Fatigue of Concrete Beams
JIN Weiliang1,2, LIU Zhendong1,2, ZHANG Jun2,*
1 Institute of Structural Engineering, Zhejiang University, Hangzhou 310058, China 2 School of Civil Engineering and Architecture, Ningbo Technological University, Ningbo 315100, Zhejiang, China
Abstract: The characteristics of four typical magneto-mechanical models were analyzed based on the magneto-mechanical effect mechanism of ferromagnetic materials. By comparing the numerical simulation results of the magneto-mechanical effect in the static loading stage of a flexural concrete beam, it was found that the stress-coercive force relationship representing macroscopic magnetic properties exhibited good applicability. A magneto-mechanical model suitable for the fatigue stage of concrete beams was established based on the decay mechanism of the magneto-mechanical effect under high stress levels, and numerical simulations of the magneto-mechanical effect in fatigue-induced flexural concrete beams were conducted to investigate the correlation between characteristic magnetic signals and fatigue life. The research results showed that the modified magneto-mechanical model exhibited a three-stage variation pattern in the static loading stage, consistent with experimental results, with a simulation error of approximately 8%. The simulated magneto-mechanical time-varying curve in the fatigue stage showed a consistent variation pattern with experimental results, with an error within 15%. A mapping relationship equation between fatigue life and characteristic magnetic signals in flexural concrete beams was established, and the calculated results were in good agreement with experimental results, serving as a predictive model for fatigue life in flexural concrete beams.
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2025, Vol. 39 
