Simulation Of Dynamic Response Of Ship Plate Structure Under Under-water Osculatory Explosion

The destruction of ship plate structure under the impact load caused by the under-water explosion is an extremely complex problem. Doing thorough research on this problem is really important. It is not only helpful to design the most reasonable structures which can resist the impact load caused by explosion of the missile warhead, but also helpful to the design improvement of the missile warhead.This dissertation mainly discusses the simulation analysis of the destruction of ship plate structure under the impact load caused by the under-water explosion.A series of simulation analysis has been carried on by the finite element software Ls-dyna. Firstly,the flat plate model and the stiifened plate model with different stiffened type are simulated by the Ls-dyna.By comparing the results,we can conclude that the stiffened plate is safer than the flat plate,when they are impacted by the under-water explosion. Secondly, the monolayer flat plate under the impact load caused by explosion of multi-explosive is simulated by the Ls-dyna.Moreover,the influence of different medium between the plates to the effect of the destruction caused by the explosion is stutied and the reasonable distributed situation of the plates can be obtained.Monte Carlo Simulation(MCS) is used to calculate the failure probability of the monolayer steel plate under the impact load caused by the under-water explosion.Considering that MSC has the disadvantages of enormous sample quantity and time-costing, a new method is adopted ,which decreases the sample quantity and takes full use of the information of the random variables. 100 groups of the random variables generated by the Random Number Program are input to the Ls-dyna for computation.Fit the 100 groups of stress results to the stress distribution function and then the failure probability can be obtained.