Magneto-Mechanical Effect and Numerical Simulation Method for Fatigue of Concrete Beams
The characteristics of four typical magneto-mechanical models were analyzed based on the magneto-mechanical effect mechanism of ferro-magnetic 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 modi-fied 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 sig-nals in flexural concrete beams was established,and the calculated results were in good agreement with experimental results,serving as a pre-dictive model for fatigue life in flexural concrete beams.
concrete beamfatigue damagemagneto-mechanical effectmagneto-mechanical modelfatigue life
万方数据
维普
