UNDERWATER PLATE HOLING STUDIES

摘要

This investigation describes a combined experimental and simulation study on the response of steel plates subjected to explosive charges in contact underwater. The experiments were designed to perforate the plate by plugging and then cause subsequent tearing or petalling of the plate. The simulations were performed using the Eulerian hydrocode GRIM to predict the plate loading and the Lagrangian hydrocode DYNA to predict the response of the plate. The failure of the plate was captured using a simple erosion criterion based on a critical damage number. The most successful techniques for transferring the loading was a simple momentum dump option and good agreement was obtained compared to the experimental data, This also demonstrated that the dynamic pressure loading from the water was a major contribution to the loading. These results are quite surprising since the loading is non-impulsive in nature.