DYNAMIC ELASTIC VISCOPLASTIC RESPONSE OF HULL PLATING SUBJECTED TO HYDRODYNAMIC WAVE IMPACT/

A numerical simulation of the response of a flat plate subjected to hy drodynamic wave impact is presented. The formulation is based on a tim e domain solution of the large deflection plate equations using a fini te difference mesh. The material behavior is elastic/viscoplastic, fol lowing the classical Perzyna model, and the procedure is validated aga inst a series of model collision experiments. The correlation results were found to be good and the procedure was subsequently used to predi ct the response of plating subjected to wave impact loads, characteriz ed by a steep rise to a maximum pressure followed by an exponential de cay. A comparison with an analytical model was conducted and following this a parametric study of the characteristics of the pressure pulse was carried out. The paper concludes with a study of the effect of mul tiple wave impacts. It was found that, even though individual impacts may not cause rupture, a small number of these may lead to rupture of the plating, provided the maximum pressure is large enough.