The Numerical Simulate Of Dynamic Responses Of Marine Structures Subjected To Underwater Explosion Loading

The vitality of ships is one of the important performance indicators of the ship. The destructive power of underwater explosions on ships and other underwater structures pose a serious threat to them. As the varieties of characteristics about the underwater explosion, the study of it has unique appeal. People use various methods to study it. In this paper, the dynamic response and damage of the structures subjected underwater explosive loading is studied using the numerical simulation method.First, according to semi-analytical and semi-empirical formula and Geers-Hunter's integrated wave-effects model for an underwater explosion bubble, the underwater explosive loading is studied. It can simulate underwater explosive loading from the shock wave to the first pulse of the bubble very well.Secondly, the underwater explosion loading' count and the numerical computation method of dynamic response of the model by various underwater explosion bubble is studied using ABAQUS software with the Geers-Hunter's integrated wave-effects model. This method is affirmed by means of comparison between the numerical result and experiments. Then the whipping responses of the model attacked by various underwater explosion bubbles are investigated in detail. The whipping responses with respect to the different angles, attack positions and charge are analyzed.Again, dynamic elasticity and plastic response is studied using numerical simulation method for a model of the ship near the water surface. The formation of plastic hinges is explored. Infer that partial-cell failure under the effect of shock wave and the bubble pulse frequency close to the structure of the natural frequency, at this state, the bubble give the structure strong pulse and form the plastic hinge.Finally, the text is designed to study the damage of the ship model on the basis of the previous four conditions. It expatiates the dynamic deformation process of the structure. The dynamic response of ship models and the damage at underwater explosive loading from the strain, acceleration, velocity and displacement, as well as the plastic response is studied.