Piezomagnetic fatigue simulation of concrete structures based on modified magneto-mechanical model
In order to quantitatively analyze the fatigue state of concrete beams by the magnetic signal of steel bars in concrete beams under the magneto-mechanical effect,the advantages,disadvantages and application scope of several magneto-mechanical models were integrated,and a magneto-mechanical constitutive model suitable for the elastoplastic stage of ferromagnetic materials was proposed.The magnetization characteristics of concrete beams in the elastic and elastoplastic stages were quantitatively simulated and analyzed by ANSYS.The magneto-mechanical effect of concrete structures during pseudo-dynamic and fatigue loading was simulated by finite element method,and the time-varying curve of magnetic induction intensity at the measuring point was obtained,which was compared with the results obtained by experiment and implicit differential model.The results show that the modified magneto-mechanical model accurately captures the observed three-stage variation pattern during the elastic phase,including a linear segment before beam cracking,a rapid magnetization stage post-cracking,and a saturation stage in the late loading period.Moreover,the magnetic field simulation results of this model can reflect the relative positions of stirrups,longitudinal bars,and the loading conditions of the beam.In the fatigue phase,the simulation results exhibit consistency with observed experimental patterns,demonstrating high precision and agreement with experimental results on the same scale.The modified magneto-mechanical model not only establishes an intuitive mapping relationship between stress and magnetic properties but also proves to be more user-friendly compared to the implicit differential model.Thus,the model can be used as a quantitative tool for investigating magneto-mechanical effects.
concrete structurefatigue damagemetal magnetic memoryelastic-plastic magneto-mechanical modelnumerical simulation
NETL
NSTL
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