Damage evaluation of a simplified hull girder subjected to underwater explosion load: A semi-analytical model

A new analytical model to predict the damage of a simplified hull girder (SHG) subjected to underwater explosion (UNDEX) shock wave load and following bubble pulsation load is presented. In the shock wave phase, the rigid-plastic material model and triangular pressure distribution assumption are adopted to build the governing equations. Based on this model, a new damage indicator of a SHG is derived and discussed. In the bubble pulsation phase, damage types and severity are evaluated based on the Vernon bubble model and the modified hydro-plastic series equations. Analytical results are compared with experimental data and numerical simulations. It is shown that the proposed model is able to capture the essential response features and damage types of a SHG both in shock wave phase and in bubble pulsation phase.