【作者】 张馨；

【导师】 王善；

【作者基本信息】 哈尔滨工程大学 ， 结构工程， 2006， 硕士

【摘要】 水下冲击载荷对舰船板壳结构的破坏是非常复杂的，对于该问题的深入研究，有助于设计出最合理的能够有效的抵抗导弹战斗部攻击的结构。随着现代化、攻击型武器的发展，开展这方面的研究显得尤为重要。本文针对水下爆炸冲击载荷对舰船板壳结构的破坏，进行了仿真分析和研究。 利用有限元计算软件LS DYNA进行了一系列有关水下接触爆炸引起的冲击载荷对舰船板壳结构破坏过程的仿真模拟。首先，模拟仿真了平板和矩形加筋板的水下爆炸的过程，分析了平板、井字加筋板、十字加筋板在相同爆炸冲击载荷作用下的破坏过程，得出矩形加筋板的抗爆能力强于平板的抗爆能力。其次，模拟仿真了单层钢板在水下多炸药同时爆炸作用下的动力响应，根据炸药位置的不同，分析对钢板的不同破坏程度。另外，本文还模拟了多层板水下的爆炸过程，针对板与板之间不同介质进行了对比分析，得到合理的分布情况。 采用蒙特卡罗模拟的方法得出单层钢板在水下爆炸冲击荷载作用下的失效概率。蒙特卡罗模拟通常要求样本数量很大，耗机时较多，而本文采用对较小的样本数量进行拟合的方法，这种方法充分利用了各随机变量的具体信息，大大简化了计算。即用产生随机数程序得到100组随机变量的初始值，然后进行仿真计算，得到钢板在冲击荷载作用下的应力分布。再拟合应力分布的分布函数，进而求得冲击破坏概率。更多还原

【Abstract】 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.更多还原