Numerical analysis on deformation and energy absorption characteristics of stiffened plate under explosive impact loads

  Objectives  In order to analyze the deformation and energy absorption characteristics of the stiffened plate under explosive impact loads,

  Methods  the finite element analysis software LS-DYNA is used to simulate and calculate the deformation and energy absorption of the clamped stiffened plate under the explosive impact loads. The one-way stiffened plate is taken as the study object, the deformation and energy absorption characteristics are analyzed, the overall deflection and the local deflection of the stiffened plate are obtained, the ratio of these two deflections is used to indicate the proportional relationship between the local energy absorption and the overall energy absorption of the stiffened plate.

  Results  The results show that the overall deformation of the stiffened plate decreases as the relative stiffness increases under certain explosive impact loads. The ratio of the local deflection to the overall deflection increases as the relative stiffness increases. The ratio of the local energy absorption to the overall deformation and energy absorption increases as the relative stiffness increases.

  Conclusions  The dimensionless relative stiffness and deflection ratio proposed in this paper can provide study references and ideas for the ship anti-explosion and venting structure design.