The work aims to investigate the cumulative trend of plastic deformation of the stiffened plate structure under re-peated impact loads,analyze the effect of the main parameters of the stiffened plate on the damage evolution process,and reveal the change mechanism of the stiffened structure under high-speed and repeated impact.The dynamic deformation calculation method of the stiff-plastic stiffened plate based on energy method and the numerical simulation method based on Johnson-Cook constitutive relation were established to study the effect of different plate thickness,impact energy and impact size on the de-formation evolution of the stiffened plate.The theoretical model and the numerical method were compared and analyzed,and the structural damage evolution rules of the stiffened plate under different parameters were obtained.The theoretical solutions are in good agreement with the numerical solutions.With the increase of impact energy,the amount of plastic deformation and the accumulation rate of plastic deformation of the stiffened plate also increase.The greater the degree of load concentration,the greater the damage effect to the collision boundary.
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