Experimental study on hysteretic behavior of corrosion steel in the neutral salt spray

To study the hysteretic characteristics of corrosion steel plate in the neutral salt spray environment,steel specimens under different corrosion degree were got by sprinkling salt spray to accelerate corrosion. Then each specimen was subjected to cyclic loading test and analyzed the hysteretic behavior,Ramberg Osgood model was adopted to fit with the circular skeleton curve of steel,and model for hysteretic constitutive of corrosion steel was established based on the first time loading criterion,unloading criterion,cycle skeleton criterion and reloading curve criterion. The experimental results shows that: corrosive steel appeares the phenomenon of cyclic hardening and peak point pointing effect under cyclic loading; and the Ramberg Osgood model has better simulated results.With the corrosion degree increasing,the mechanical properties of the steel decrease,the deterioration of ductility becomes more serious and coefficient of steel circular enhancement shows a decreasing trend,whereas the variation of cyclic hardening exponent is not obvious. The proposed model agrees well with the experimental results.