Effect of initial imperfections of the response of cylinders to underwater explosion

Abstract

Presently, the United States Navy is searching for an improved method to predict the damage to a ship or underwater structure that results from an underwater explosion. One method of predicting this damage is through the use of nonlinear finite and boundary element analysis. Underwater Shock Analysis (USA) code combined with VEC/DYNA3D code is used for the analysis of the effect of explosive shock on numerical models. Initial geometric imperfections are introduced in the numerical model using modal imperfections. The resulting numerical model is then subjected to a simulated underwater shock using the combined USA/DYNA3D code. A sensitivity analysis is performed to look into the details on the damage resulting from these simulations